CA2003835C - Enossal implant with an elastic intermediate element and metal spacer sleeve - Google Patents
Enossal implant with an elastic intermediate element and metal spacer sleeveInfo
- Publication number
- CA2003835C CA2003835C CA002003835A CA2003835A CA2003835C CA 2003835 C CA2003835 C CA 2003835C CA 002003835 A CA002003835 A CA 002003835A CA 2003835 A CA2003835 A CA 2003835A CA 2003835 C CA2003835 C CA 2003835C
- Authority
- CA
- Canada
- Prior art keywords
- implant
- post
- implant according
- denture
- intermediate element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
- A61C8/0086—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools with shock absorbing means
Abstract
Enossal implant with a fastening head and fastening means having a metal implant post screwable to a basic structure for a snugly fitting, conditionally removable denture with a spacer sleeve provided with a centring collar, insertable into the open end of the basic structure and engageable with a shoulder on the upper edge of the basic structure and an intermediate element made from elastic material, such as plastic, zonally concentrically surrounding the implant post, characterized in that the spacer sleeve is made from metal and is closed at its end remote from the fastening head for the denture and can be screwed into the basic structure, that the intermediate element is insertable in a widening at the open end of the spacer sleeve and is provided with a ring shoulder for engaging on the upper edge of the spacer sleeve, that the intermediate element has an inner bore, whose diameter in an area facing the fastening head for the denture and remote from the spacer sleeve is larger than the external diameter of the implant post and that, accompanied by the pressing of a bearing face of the denture facing the intermediate element onto a bearing shoulder of intermediate element remote from the spacer sleeve, the implant post can be screwed into the spacer sleeve.
Description
.` 2003835 E!~SSaL ~IPIANT Wl~H AN EL~SrIC I h ~ A I r ELEMENT
AND MhTAL SPAOER SLEEVE
The inventirn relates to an enossal irnplant with a fastening head and 5 fastening means having a metal i~plant post screwable to a base st}ucture for a snugly fitting, rrnflitirnAlly removable denture with a spaCOE sleeve provided with a centring collar, insertable in the r,pen end of the basic structure and Pn~A~AhlP with a shouldOE r,n the upper edge of the basic structure and an inl ';AtP element made frcm an elastic material, such 10 as plastic, zr~nally cancentrically !~l~mfl;n~ the implant p~st.
EP~S-0216 931 discloses an enossal implant of this type, in which the spacer sleeve has a bore open at the tcp and bottan and which is e.g. made frcm plastic. The ;n' ';At~' element is directly insOEted in the basic 15 structure and, optionally in cr~n~unction with the elastic matOEial spacOE
sleeve, assu~nes rP~n~ih;l;ty for the rll~h;rn;nr~ of the fastening head or denture with respect to the basic structure in all directir~ns, i.e.
both with respect to vertical and latOEAlly acting loads. ~ ltanPrlcly an electric in~llAt;rn is ensured between the denture and the hasic 20 structure, so as in this way to prevent the ~. ,,, ~ ,. - of har,rful creeping currents, which can lead to cor~sion and irritation to the bcdy tissue.
The knadn i~nplant has in principle proved ~At;~fAt t~ry, but it hAs been found that the ~iAtP element, which not anly has a bearing and 25 danping function, but also a fastening function for the implant post, particularly under tension has a fatigue breakage tendency. It h~as also been faund that the extent of the d2mping should possibly be adjustable, 80 as in this way to ensure a greater fl~x;h;l;ty in the most varied use cases .
The problem of the invention is to so furthPr develq? the enossal i~plant of the aforementioned type, that the risk of fatigue breakages under tension is removed or at least drastically reduced and ~1~ an adjust-ability of the d2mping functian can be achieved in the case of higher 35 ~;t;f)nAl precision of the denture.
According to the invention this problan is solved in that the spacer slee~e is made from metal and is closed at its end remote fran the fastening head for the denture and can be screwed into the basic structure, ~ -- 2 ---that the inl ';i~ element is insertable in a widening at the c~?en end of the spacer sleeve and is prc)vided with a ring shc~ulder for engaging Qn the upper edge of the spacer sleeve, that the ~ element has an inner bore, whose dianeter in an area facing the fastening head for the 5 denture and re~note frcm the spacer sl~ve is lArger than the e~cternal diA~eter of the implant post and that the iTIplant post, ~c , ;~1 ~y the pressing of a bearing face of the denture facing the ill~ ';At~
element against a bearing shQu~er of the ~l~ ';Ate elenent remote frcm the spacer sleeve can be screwed into the latter.
The screwing-in depth of the implant post into the spacer sleeve can bemade adjustable.
The invention also prc)poses that in its area in cc~ntact with the denture, 15 the impl~nt post has a plastic envelope or the like.
Acccx~ding to another ` ' L of the invention, the denture is elastic-aLLy and/or easily ~l;crlAr~Ahly mounte~ relative to the ~mplant post in the a~cial direction thereof. A plastic ring or the like can be prq;t;r~
20 between the denture and the 3mplant post.
Alternatively thereto, the elastic molunting of the denture with respect to the DTlplant post is ensured hy a ~~ li g wll~LLu~LQn of the pl~stic envelope of the ilTplant post head.
The inventiQn also prQposes that the widening of the spacer sleeve receLving the il~ te element in flush manner is cQIstructed 80 as to cQnically widen tcwards the open end.~
30 According to the invention the ilTplant post can be screwed with adjustable tor;~ue into the spacer sleeve.
Another ~ L of the inventiQn is ~.I~L~ L i7ed in that the basic structure and/or exposed cir~ ~L~-~ial area Qf the spacer sleeve is/are 35 coated with hydr~cyl apatite Qr the like.
~rr ~rll;n~ to the inVentiQn the implant post can be coat~d with adhesive ... ..
-` Z003835 at the _ower end in the vicinity of its external thre2d.
A~c~7;n~ to the invention the ini 'iAtr. element is mAL~e ccmpletely frcm an e_astic materiAl, such a3 p_astic, whi_st the inner bore of the inter-5 mediate element has a steppe-~ width, its diAmeter in an area facing the spacer sleeve essentially uuLLe~ullding to the external diAmeter of the imp_ant post and in the directirn of the fastening he_d for the denture is camected thereto the area with the diAmeter Arger thAn the external diameter of the imp_ant post.
As r7r~rrih~7 hPrPinh~fr~r~o, the invention is based r~n the Cllrrr;c;n~ findingthat it is possible to solve the ~. rmr~7 set prrJb~m in a partic-rly Arrr~rriAtP and CAt;c~Af~tr,ry manner, in that the ~.l ~iAtP element~I~LLuuL~l as an inner sleeve according to the prior A~t, no longer selves 5 2s the fasten~ng part for the implan t post and as 2n r-lr~tri~Ally and irAlly inc~llAtin~ or damping element 2nd instead the ~lchir~nin~ or dAmping effect is "split off" frrJm the fastening functi~n. T-h-e metal implant post, in ccmjunction with the metal spacer sl~ ensures a rel i~ble and precise fixing of the dentur~ in the basic strllcture. Hrwever, the 0 dA~ping functir~n is ensured by the i,~ 'iAtr. element r~nrPntr;r~Ally sllr~am~linrJ the implant post, damping taking place in the vertic21 directir~n c~er the volume elasticity of the i~ ;AtP element, which is variable with different tolgue by fastening or t;~htPn;n~ the implant post, whilst the damping functi~m in the lateral directirn by the implant post c~erating 25 according to the vibrating b2r principle and which is located in a cOrrec_ pcnding, zc~lally widened inner bore of the ' 'iAtP ele~ent, is achieved in ccnjunction with the material of the il 'iAtP element. On pivoting the denture located cn the implant post ~ iv~ and tensile fcrces, 2s well as bending mcments are exerted cn the -' i~te elcment. The risk 30 of fatigue bre~ks under the acticn of tension existing with the hitherto kncwn implants is obviated by the invention.
As in the prior 2rt, poly~ Ulylene can be use~ for the intPr~ tP
element. Opticnally, through a ~ lin~ choice of the implant rost 35 ---tPriA1, it is possibLe to influence the rigidity of the system. Option-ally the lower end of the implant post in its screwing-in region can be o~ated with adhesive, so that in Addition to the screwing-in action into the b_sic structure there is an adhesive joint preventing loosening, but which c~n obviously be release~ again in the case ~f vigorous 7mr~,rPw;nrJ, The supporting of the irnplant post in the ~~-i 'iAte element can 5 naturally take place at different levels and the rigidity can be ;nflllr~nnr~
not r~nly by this, but ~lso by di~meter changes of the i~r~plant post.
It has been found thAt in the case of the ' 'irmr~rl ' '' ' of the i~nplant accorling to the invention, in which the i~ iAtr. element is lO made entirely from e.g. plastic and has a stepped width inner bore, whose diAmeter in an area facing the spacer sleeve substAnt~ally ~ L~ rl~ to the external diA~neter of the implant post and in an upper area connected ~n to the sAme in the directir~n of the denture fastening head is lilrger than the external diAmeter of the implant post, the obtaining of a satis-15 factory vertical elasticity and ~ Anr~lr~ly a r~At;~fAr~nry horizontalelasticity is still not ~ ly ensured in a r;At;r~fAr~nry manner.
This is due to the fact that for obtaining an Adequate vertical elasticity the plastics material frcm which the integral illi i~te element is made 20 must be relatively soft, so that the lateral elasticity can easily beccme t~o large, because a pivoting movement of the inplant post according to the vibrating bar principle is not offOEed a suKiciently large rP~;r~Anrr- by the .~ ;A~r~ element. In particular the lateral ~r~flr~tirm of tbe inplant post operating according to the vibrating bar princiole is not as 25 reliably limited as walld be desirable in the aforementioned ' '' ~ of the implant according to the inventiQn if during a latOEal ~lrflr~t;on the implant post engages on the wall of the innOE bore of the illl 'iAte element when the latter is made fran a relatively soft plastics material.
30 In ordOE in simple manner to achieve both a satisfactory vOEtical elasticity and si~ultane~usly a satisfactory latOEal elasticity ~ith a reliable lateral rlPflr~t;Qn of the implant post~ the invention fur~ther prQposes that the ili ~;A~P element has an inl ~;A~P element core m2de frcm a relatively stiff material r~lrrr~mrl;n~ the implant post and an ~~ A~P
35 element sleeve mAde frcm a relatively soft, elastic material ~Ir~m~inrJ
the area of the ring shouldOE and/or ~ shouldOE.
me intermediate element core can be mA e frcm rigid plastic, such as polyw.~ lene or the like.
Arrr)nl;nq to the invention the u.i ~iAte element core can also be made 5 from metal.
Arrnr~l;n~ to the invention the ;r' 'iAtP element core can be nadP frcmtitanium, 10 Arr~r~;ns to the invention the ;r' ';Ate element sleeve is made frcm a flexible plastic, such as polyuL~U~.e or the like.
A further ' ' L of the inventi~n i8 . ~ ;7P.'l in that the inter-mediate element corP has a sleeve-li~ce cw~LLul:Lion and in the vicinity of 15 the ring shoulde~r and the be!aring shoulder has a collAr.
The ';AtP element s~ve can be positively connected to the inte}-mediate element core.
20 ~rrr~r~l;n~ to another ' ' ' the coll~r has an undercut.
Arr~r~lin~ to the invention it is possible fclr the u,i ';Al'P element sleeve to be sh~ped on to the -' ';~te element core in an injection moulding process.
Arr ~r~l;n~ to the invention, the inner bore of the ' ~;A~ element corehas a ce!ntral area i,n the vicinity of the ring shoulder and the bearing shoul~ler, in which the internal di~meter of the inner bore substantiaLLy to the external diameter of the irrplant post.
The smaller internal diAmeter central area of the iDner bore of the inter-mediate elenent core can have the same distance frcm the end faces of the ll~L ';Ate eLement. AlternativeLy thereto, it i8 aLso possible according to the invention for the smaLLer internal diameter centraL area of the inner 35 bore of the il' ';Ate element core to have a varying spacing frcm the end faces of the ' ';A~I~ element.
~ z003a3s -Due to the fact that in the ab~ve-described ~ ~t~, the ul' ~iAtP
ele~ent is formed fmn two different, _ L~, namely an ' ~iAtP
element core m2de fr~n a rigid, h2rd material, preferably e.g. titanium and an ~lIL 'iAtP e~ent sleeve at least z~ally ~Irrnmfl;n~ said hard core 5 And which can be mAde frcm a soft, flexible plastic, it is possible on the one hand to reliably limit the lateral deflection of the implAnt post by the i~l~ 'iAtP element core, so that no excessive lateral fl~fl~rtinn~ are possible, whilst ! lltAn~lqly a ~At;cfArtnry vertical elssticity is en~ed that in the vicinity of the ring sh~ulder and the bearing shoulder 10 there is, _ hll~, soft, elastic plastics material, such as polyuL~U~-~, for Absorbing a vertical, ' ~_ stress. Ebllowing the inventive concept in which, ccmpared with the prior art, the hitherto ccmbined functions of the fastening part for the implant post on the one hand and the electrically and iri~lly ;ncll1Atin~ and damping e~nent on the 15 other are made separate, in rnnnPrt;nn with the last-descrihed ' '' L, the invention proposes to further split up the two rll~h;nn;n~ or dArnping functions of the ' ~iAte element, nanely the vertical elasticity on the one hand 2nd the LL~I~V~L:,e elasticity on the other and namely through the two-ccmponent ~;uutiLlu;Lion of the illl 'iAtP element fr~n a 20 hard ill; ~iAtP element core and a soft ' 'iAt/' element sleeve.
Alfio in the case of the last-described: ' ' L~ of the implant according to the invention, the inner bore of the illl ~;AtP element can zonally undergo a diameter reduction in such a way that its internal diameter 25 ~ tAnt;Ally ~ to the external diameter of the ilTpl}mt post, although this is not Ah~nllltPly necessary for the function of the inter-r~iate eLement according to the invention. If the inner hore of the , ,t 'iAte el~ru~nt or the inl ';AtP element core has a~er its tot2L
lon~;h~inAl extension a larger diAmeter than the externaL diameter of the 30 implant post, the latter can be bent da~n to a Limitel extent within the inner bore of the i.~l ~iAtP e~nent core, the transverse deflection then being limited when the implant post ~perating accor~ing to the vibrating bar rr;nr;r1~ strikes the upper e~ge of the inner bore. As stated, accor-ding to the invention optiona31y a central area of the inner bore corres-35 ponds to the external diAmeter of the implant post and, if the central areais located L.~ ' rAlly in the lnn~;h~linAl centre, the ' ' ~iAtP
element is built up in a ~ _lPtPly L, ' rAl manner and c2n be fitted Z~038~5 in hoth directions, whereAs in the case where the central area is ",,~. ' '~'Al with respect to the lnn~ih~;nAl centre of the ~;A~
element, as a function of the i~l ';A~ element fitting direction different lateral PlARticity and dAmping ~ Rt;~'R of the .
5 element are At~A;nAhl~.
Further features and ~lV~ILay~ of the invention can he gathered fr~n the follawing description of eni~cdiments and with reference to the attached drawings, wherein show:
Fig. 1 A first embodiment of the enoRsal implant according to the invention in a lnn~;hl~l;nAl sectiQn thraugh the median longi-hldinal axis of the implant post.
15 Fig. 2 Another ' of the enossal implant.
Fig. 3 An ;~ of an ;A~ element mcdified ca~ared with the implant of fig. 2.
0 Fig. 4 The ';A~' element CQre Qf the illl ';Al-f' element of fig. 3.
Fig. 5 A maiified I ' L of an ;~ element usable in nnnn~t; nn with the implant of the ' I of f ig . 2 .
Fig. 6 The intermediate element core of the ill~ ';A1'f' element of fig. 5, the 1~lc~lL~Lion as in figs. 3, 4 and 5 ~ L~.~l;n~
to a lnn~;hl-l;nAl sectiQn through the median lnn~;h~l;nAl axis of the interTIediate element.
As sh~wn in fig. 1, in the present ~wl the implant has a titanium basic struch~lre 10, which is coated on its auter face caning into contact with the h~dy tissue ~ith hydrQxyl apatite. The function of this hasic struch~re is the same as that of the enossal impl~nt of ~P OS-0 216 031, 35 to which reference shauld be made fQr further illustratiQn of the aQeratian, e.g. the brealcs in the hasic structure 10. A titanium spacer slseve 12 is screwed into the basic struchlre 10. Spacer sleeve 12 engages with a shallder 14 on the upper edge of basic structure 10 in the manner apparent fram the drawing. It is closed at the lcwer end facing the basic structure 10 and has at its lawer, closed end an inner bore provided with an internal thread. A centring collAr is formed by a widening 16 on the upper end of 5 spacer sleeve 12. The ~ Lial surface of spacer sLeeve 12 o~ming into cantact with the bcdy tissue is coated with bcdy tissue-friendly hydroxyl apatite, in the same way a6 ~asic structure 10. An elastic inter-meiiate eLement 18 ma~e frcm polyaxymethylene is inserted in the widening 16 of spacer sleeve 12 and its inner bore in the la~er region facing 10 spacer sleeve 12 has an internal diameter substantially ~I" ~L~"~l;n~ to the external diametPr of a titanium irt!plant post 20. Hawever, its upper bore region is much wider than the external diameter of implant post 20.
The latter is also prcvided at its lawer end facing basic structure 10 with an external thread by means of which it can be screwed into the 15 ~ l;ng internal th~e~ of the spacOE sleeve 12. Iui ';Al~P
element 18 engages with a ring shoulder 24 an the upper e~ge of spacer sleeve 12. On a bearing shoulder 26 of the ' ~;A~P element facing ring shoulder 24 engages a Lawer bearing face of a denture 28. The implant post provided at its upper end with a plastic envelape 30 presses 20 the bearing face of denture 28 against the bearing shoulder 26 of the elastic i,i 'iAtP element 18.
It is important in the above-described ....~1",. 1 ;~n that the implant post 20 freely traverses the upper regian 22 of the inner bore af the elastic ~iAtP element 18, i.e. withaut engaging an the inner wall of the inner bore of said ' ~;A~P element 18. As a functian of the screwing-in depth of implant post 20 or as a function af the heightwise ~;~Llu~:Lian, f~nq;f~PrPr~ in the axial di~ectian of the implant post 20, of the upper~
region 22 of the elastic i,~i 'iAt'P element 18, that height area in 30 which the implant post 20 "freely" traverses the in~ ';Atf' element 18 is adjustable. As a functian of the height of the upper area 22 of inter-mediate eLement 18, in which the implant post 20 does not engage an the inner waLL of the bare of i! ' ';AtP element 18, the rigidity of the "vihrating rcd~ farlT~ by inplant post 20 is higher ar 10wer. With 35 respect to the implant past 20, the denture 28 is mounted in an e_sily li~)lA~'~'AhlP or verticaLLy resilient manner; it being possible to mcdify the Length of the implant post 20 to adapt to the particular ~installatian ~ g height". This is either braught abGut by il l~.L~ a (`1~ L~ l;n~
plastic ring or a ~ l;n~ construction of the plastic envel~Ge 30.
Plastic envelope 30 always prevents an Pl~r;c~lly :~u~;Liv~ caltact between denture 28 and implant post 20, so that it is ensured that the 5 denture 28 is electrically insulate~ against the basic structure 10. This prevents harmful creeping currents, which can lead to corrosion and the like. In addition, denture 28 is elAstically resiLiently mounted in all directions with respect to basic structure 10. This is firstly ensured by the vibrating rcd action of implant post 20 and also by the elastic lO dAmplng acting against vertical forces in the axial direction of implant post 20 brought about by the ';R~f' element 18. The elAsticity or ~Iffh;(~n;n~ ensured by ;A~P el~5nent 18 can also be varied by tight-ening the implant post 20 with different tor~ues.
15 A8 showln in fig. 2, in the r~r~l~~r~l ~ the implant has a titanium basic str~lcture 10, which is coated on its outer face coming into cantact with the body tissue with hydraxyl apatite. The function of this basic structure ~ . to that of the enoss~l implant according to EP OS-0 216 031, to which reference shGuld be m~e for further ~lAnA~ n 20 of the basic structure lO. Into the basic structure 10 is screwed a t;tanium spacOE sleeve 12. A shallder 14 of spacOE sleeve 12 engages an the UppOE edge of basic structure 10 in the mannOE sh~n in the drawing.
It is cLosed at its lower end facing the basic structure 10 and ~as at it3 la~er, closed end an interna~ly threAded innOE bore. A centring collAr is 25 formed by a widening 16 at the upper end of the spacOE sleeve 12. The c~ ~ Lial surface of the spacOE sleeve 12 caning into contact with the body tissue is coated with bGdy tis8ue-friendly hydroxyl apatite in the sAme way as basic structure 10.
30 An elastic u-~ ';Ate element 18 is insOEted in widening 16 of spaCOE
sleeve 12 and is m~de fran a rigid, hard in~ ';At~' element care 18a of titanium and a relatively flexible elastic i ~;A~ element sleeve 18b of polyulc:U~Ie. In the lGwer regian facing spaCOE sleeve 16, the innOE
bare of the ';A~P element core 18a ha8 an internal diametOE, which 35 sub8tantially ~ lff to the external diametOE of a titanium implant post 16. HGwevOE, in the Up,GOE bore regian it is made much widOE than the Z0038~5 external dianeter of implant post 20. On its lower en~ facing the basic structure 10, the ilTlplant post 20 has an external threAd, by means of which it cAn be screwed into the ~ L~ J internaL thread of the spacer sleeve 12. T ' ';AtP element 18 engageg with a ring shoulder 24 on 5 the upper edge of spacer sleeve 12. A lower bearing face of a denture 28 engages with a bearing shoulder 26 of the ill~ 'iAte element facing the ring shoulder 24 and at its upper end the implant post, prwided with a plastic envel~e 30, presses the bearing face of denture 28 against the bearing shculder 26 of the elastic; ' ~iAtP eLement 18.
With regards to the aperatian of the above-described uw~Llu~:Lian, including the cllvallLaycs of the ' '' ~ sh~n in fig. 2, reference should be made to the descriptian of the embcdiment of fig. 1, unless the ~LluuLion of the iUI~ ~;At~ element 18 as an ' ' ~;AtP el~nent oore 18a and, ~;At~ element gleeve 18b is involvei. Fig. 1 shows in o~nnection with the i!l~ ~;AtP element 18 that the i~ ;AtP eLement core 18a has a collar 32, which serves to keep the ' ' ';AtP element sleeve 18b, preferably prcduced by injectian moulding, fir,rLLy engaged on the ill' ~;Ato el~nent core 18a.
In the ' '' ' according to fig. 3 the i-~ ~;AtP element 18 ance again has a titanium ill' 'iAt~ element core 18a, whose collar 32 is ~Llu~Ltd in such a way that An undercut is formed, which is undercut by the polyurethane sleeve 18b applied by injectian mculding. I;ig. 4 25 shows the constructian of the ' ' ~iAtP element core 18a with its collAr 32 and its undercut.
The ' '' ' of the ini 'iAtP element according to figs. 5 and 6 is mcdified c0~pAred with those af figs. 3 and 4 in that the ' ' 'iAto 30 element core 18a hAs in its central regi~n 34 in the direction of the median lnn~hl~linAl axis a s~Ller internal diameter, which in this regian essentially ~ to the external diameter of irrpLant post 20 (fig. 2). The centraL regian 34 is e~uidistant fr~n the upper and Lower end face, as s~wn in the drawings, 80 that the in' 'iAtP element 18 can be install~ in the implant in bath directions without changing the harizantal elasticity ~ I,, ,- 1, iqtiCs. NaturaLLy an ' '' L is alJ;a ~ 201[)3835 possible in which the central region 34 is arranged c_, nAlly with respect to the median lQn~ihl~inAl axis of the intermediate elenent 18 and then different h~r;7rn~Al elasticity ~ c~,LeListics ~ould be obtained as a function of the fitting direction of ~li ';Ate elenent 18.
As a result of the inventive construction of the illl ';Ate el~nent 18,nanely su~divided into two, , i ', i.e. the hArd ' ~ 'iAlLP elenent core 18a and the flexible elastic illt ';A1'~ el~ment sleeve 18b, it is ensured that in the cAse of vertical stressing in the vicinity of ring 10 shoulder Z4 and b~ing shoulder 26 relatively flexible elastic plastics material is available, which ensures a ~A~i~fAn~l~ry vertical .l,f"r-~l ;nn, whilst I l~An~l~ly the hard ~aterial of the i~l~ ';A1-~' el~nent core 18a prevents an lm~l~q;rAhly rrnn~m~l lateral rlofl~f;~n in the case of LLall:,v~ stressing by bending of the impl~nt post.
The features of the invention disclosed in the d~l~Li~l, drawings and clairns can be essential to the different o ` ' Lli thereof both singly and in the fo~n of, ' ;nA~;nn~ .
AND MhTAL SPAOER SLEEVE
The inventirn relates to an enossal irnplant with a fastening head and 5 fastening means having a metal i~plant post screwable to a base st}ucture for a snugly fitting, rrnflitirnAlly removable denture with a spaCOE sleeve provided with a centring collar, insertable in the r,pen end of the basic structure and Pn~A~AhlP with a shouldOE r,n the upper edge of the basic structure and an inl ';AtP element made frcm an elastic material, such 10 as plastic, zr~nally cancentrically !~l~mfl;n~ the implant p~st.
EP~S-0216 931 discloses an enossal implant of this type, in which the spacer sleeve has a bore open at the tcp and bottan and which is e.g. made frcm plastic. The ;n' ';At~' element is directly insOEted in the basic 15 structure and, optionally in cr~n~unction with the elastic matOEial spacOE
sleeve, assu~nes rP~n~ih;l;ty for the rll~h;rn;nr~ of the fastening head or denture with respect to the basic structure in all directir~ns, i.e.
both with respect to vertical and latOEAlly acting loads. ~ ltanPrlcly an electric in~llAt;rn is ensured between the denture and the hasic 20 structure, so as in this way to prevent the ~. ,,, ~ ,. - of har,rful creeping currents, which can lead to cor~sion and irritation to the bcdy tissue.
The knadn i~nplant has in principle proved ~At;~fAt t~ry, but it hAs been found that the ~iAtP element, which not anly has a bearing and 25 danping function, but also a fastening function for the implant post, particularly under tension has a fatigue breakage tendency. It h~as also been faund that the extent of the d2mping should possibly be adjustable, 80 as in this way to ensure a greater fl~x;h;l;ty in the most varied use cases .
The problem of the invention is to so furthPr develq? the enossal i~plant of the aforementioned type, that the risk of fatigue breakages under tension is removed or at least drastically reduced and ~1~ an adjust-ability of the d2mping functian can be achieved in the case of higher 35 ~;t;f)nAl precision of the denture.
According to the invention this problan is solved in that the spacer slee~e is made from metal and is closed at its end remote fran the fastening head for the denture and can be screwed into the basic structure, ~ -- 2 ---that the inl ';i~ element is insertable in a widening at the c~?en end of the spacer sleeve and is prc)vided with a ring shc~ulder for engaging Qn the upper edge of the spacer sleeve, that the ~ element has an inner bore, whose dianeter in an area facing the fastening head for the 5 denture and re~note frcm the spacer sl~ve is lArger than the e~cternal diA~eter of the implant post and that the iTIplant post, ~c , ;~1 ~y the pressing of a bearing face of the denture facing the ill~ ';At~
element against a bearing shQu~er of the ~l~ ';Ate elenent remote frcm the spacer sleeve can be screwed into the latter.
The screwing-in depth of the implant post into the spacer sleeve can bemade adjustable.
The invention also prc)poses that in its area in cc~ntact with the denture, 15 the impl~nt post has a plastic envelope or the like.
Acccx~ding to another ` ' L of the invention, the denture is elastic-aLLy and/or easily ~l;crlAr~Ahly mounte~ relative to the ~mplant post in the a~cial direction thereof. A plastic ring or the like can be prq;t;r~
20 between the denture and the 3mplant post.
Alternatively thereto, the elastic molunting of the denture with respect to the DTlplant post is ensured hy a ~~ li g wll~LLu~LQn of the pl~stic envelope of the ilTplant post head.
The inventiQn also prQposes that the widening of the spacer sleeve receLving the il~ te element in flush manner is cQIstructed 80 as to cQnically widen tcwards the open end.~
30 According to the invention the ilTplant post can be screwed with adjustable tor;~ue into the spacer sleeve.
Another ~ L of the inventiQn is ~.I~L~ L i7ed in that the basic structure and/or exposed cir~ ~L~-~ial area Qf the spacer sleeve is/are 35 coated with hydr~cyl apatite Qr the like.
~rr ~rll;n~ to the inVentiQn the implant post can be coat~d with adhesive ... ..
-` Z003835 at the _ower end in the vicinity of its external thre2d.
A~c~7;n~ to the invention the ini 'iAtr. element is mAL~e ccmpletely frcm an e_astic materiAl, such a3 p_astic, whi_st the inner bore of the inter-5 mediate element has a steppe-~ width, its diAmeter in an area facing the spacer sleeve essentially uuLLe~ullding to the external diAmeter of the imp_ant post and in the directirn of the fastening he_d for the denture is camected thereto the area with the diAmeter Arger thAn the external diameter of the imp_ant post.
As r7r~rrih~7 hPrPinh~fr~r~o, the invention is based r~n the Cllrrr;c;n~ findingthat it is possible to solve the ~. rmr~7 set prrJb~m in a partic-rly Arrr~rriAtP and CAt;c~Af~tr,ry manner, in that the ~.l ~iAtP element~I~LLuuL~l as an inner sleeve according to the prior A~t, no longer selves 5 2s the fasten~ng part for the implan t post and as 2n r-lr~tri~Ally and irAlly inc~llAtin~ or damping element 2nd instead the ~lchir~nin~ or dAmping effect is "split off" frrJm the fastening functi~n. T-h-e metal implant post, in ccmjunction with the metal spacer sl~ ensures a rel i~ble and precise fixing of the dentur~ in the basic strllcture. Hrwever, the 0 dA~ping functir~n is ensured by the i,~ 'iAtr. element r~nrPntr;r~Ally sllr~am~linrJ the implant post, damping taking place in the vertic21 directir~n c~er the volume elasticity of the i~ ;AtP element, which is variable with different tolgue by fastening or t;~htPn;n~ the implant post, whilst the damping functi~m in the lateral directirn by the implant post c~erating 25 according to the vibrating b2r principle and which is located in a cOrrec_ pcnding, zc~lally widened inner bore of the ' 'iAtP ele~ent, is achieved in ccnjunction with the material of the il 'iAtP element. On pivoting the denture located cn the implant post ~ iv~ and tensile fcrces, 2s well as bending mcments are exerted cn the -' i~te elcment. The risk 30 of fatigue bre~ks under the acticn of tension existing with the hitherto kncwn implants is obviated by the invention.
As in the prior 2rt, poly~ Ulylene can be use~ for the intPr~ tP
element. Opticnally, through a ~ lin~ choice of the implant rost 35 ---tPriA1, it is possibLe to influence the rigidity of the system. Option-ally the lower end of the implant post in its screwing-in region can be o~ated with adhesive, so that in Addition to the screwing-in action into the b_sic structure there is an adhesive joint preventing loosening, but which c~n obviously be release~ again in the case ~f vigorous 7mr~,rPw;nrJ, The supporting of the irnplant post in the ~~-i 'iAte element can 5 naturally take place at different levels and the rigidity can be ;nflllr~nnr~
not r~nly by this, but ~lso by di~meter changes of the i~r~plant post.
It has been found thAt in the case of the ' 'irmr~rl ' '' ' of the i~nplant accorling to the invention, in which the i~ iAtr. element is lO made entirely from e.g. plastic and has a stepped width inner bore, whose diAmeter in an area facing the spacer sleeve substAnt~ally ~ L~ rl~ to the external diA~neter of the implant post and in an upper area connected ~n to the sAme in the directir~n of the denture fastening head is lilrger than the external diAmeter of the implant post, the obtaining of a satis-15 factory vertical elasticity and ~ Anr~lr~ly a r~At;~fAr~nry horizontalelasticity is still not ~ ly ensured in a r;At;r~fAr~nry manner.
This is due to the fact that for obtaining an Adequate vertical elasticity the plastics material frcm which the integral illi i~te element is made 20 must be relatively soft, so that the lateral elasticity can easily beccme t~o large, because a pivoting movement of the inplant post according to the vibrating bar principle is not offOEed a suKiciently large rP~;r~Anrr- by the .~ ;A~r~ element. In particular the lateral ~r~flr~tirm of tbe inplant post operating according to the vibrating bar princiole is not as 25 reliably limited as walld be desirable in the aforementioned ' '' ~ of the implant according to the inventiQn if during a latOEal ~lrflr~t;on the implant post engages on the wall of the innOE bore of the illl 'iAte element when the latter is made fran a relatively soft plastics material.
30 In ordOE in simple manner to achieve both a satisfactory vOEtical elasticity and si~ultane~usly a satisfactory latOEal elasticity ~ith a reliable lateral rlPflr~t;Qn of the implant post~ the invention fur~ther prQposes that the ili ~;A~P element has an inl ~;A~P element core m2de frcm a relatively stiff material r~lrrr~mrl;n~ the implant post and an ~~ A~P
35 element sleeve mAde frcm a relatively soft, elastic material ~Ir~m~inrJ
the area of the ring shouldOE and/or ~ shouldOE.
me intermediate element core can be mA e frcm rigid plastic, such as polyw.~ lene or the like.
Arrr)nl;nq to the invention the u.i ~iAte element core can also be made 5 from metal.
Arrnr~l;n~ to the invention the ;r' 'iAtP element core can be nadP frcmtitanium, 10 Arr~r~;ns to the invention the ;r' ';Ate element sleeve is made frcm a flexible plastic, such as polyuL~U~.e or the like.
A further ' ' L of the inventi~n i8 . ~ ;7P.'l in that the inter-mediate element corP has a sleeve-li~ce cw~LLul:Lion and in the vicinity of 15 the ring shoulde~r and the be!aring shoulder has a collAr.
The ';AtP element s~ve can be positively connected to the inte}-mediate element core.
20 ~rrr~r~l;n~ to another ' ' ' the coll~r has an undercut.
Arr~r~lin~ to the invention it is possible fclr the u,i ';Al'P element sleeve to be sh~ped on to the -' ';~te element core in an injection moulding process.
Arr ~r~l;n~ to the invention, the inner bore of the ' ~;A~ element corehas a ce!ntral area i,n the vicinity of the ring shoulder and the bearing shoul~ler, in which the internal di~meter of the inner bore substantiaLLy to the external diameter of the irrplant post.
The smaller internal diAmeter central area of the iDner bore of the inter-mediate elenent core can have the same distance frcm the end faces of the ll~L ';Ate eLement. AlternativeLy thereto, it i8 aLso possible according to the invention for the smaLLer internal diameter centraL area of the inner 35 bore of the il' ';Ate element core to have a varying spacing frcm the end faces of the ' ';A~I~ element.
~ z003a3s -Due to the fact that in the ab~ve-described ~ ~t~, the ul' ~iAtP
ele~ent is formed fmn two different, _ L~, namely an ' ~iAtP
element core m2de fr~n a rigid, h2rd material, preferably e.g. titanium and an ~lIL 'iAtP e~ent sleeve at least z~ally ~Irrnmfl;n~ said hard core 5 And which can be mAde frcm a soft, flexible plastic, it is possible on the one hand to reliably limit the lateral deflection of the implAnt post by the i~l~ 'iAtP element core, so that no excessive lateral fl~fl~rtinn~ are possible, whilst ! lltAn~lqly a ~At;cfArtnry vertical elssticity is en~ed that in the vicinity of the ring sh~ulder and the bearing shoulder 10 there is, _ hll~, soft, elastic plastics material, such as polyuL~U~-~, for Absorbing a vertical, ' ~_ stress. Ebllowing the inventive concept in which, ccmpared with the prior art, the hitherto ccmbined functions of the fastening part for the implant post on the one hand and the electrically and iri~lly ;ncll1Atin~ and damping e~nent on the 15 other are made separate, in rnnnPrt;nn with the last-descrihed ' '' L, the invention proposes to further split up the two rll~h;nn;n~ or dArnping functions of the ' ~iAte element, nanely the vertical elasticity on the one hand 2nd the LL~I~V~L:,e elasticity on the other and namely through the two-ccmponent ~;uutiLlu;Lion of the illl 'iAtP element fr~n a 20 hard ill; ~iAtP element core and a soft ' 'iAt/' element sleeve.
Alfio in the case of the last-described: ' ' L~ of the implant according to the invention, the inner bore of the illl ~;AtP element can zonally undergo a diameter reduction in such a way that its internal diameter 25 ~ tAnt;Ally ~ to the external diameter of the ilTpl}mt post, although this is not Ah~nllltPly necessary for the function of the inter-r~iate eLement according to the invention. If the inner hore of the , ,t 'iAte el~ru~nt or the inl ';AtP element core has a~er its tot2L
lon~;h~inAl extension a larger diAmeter than the externaL diameter of the 30 implant post, the latter can be bent da~n to a Limitel extent within the inner bore of the i.~l ~iAtP e~nent core, the transverse deflection then being limited when the implant post ~perating accor~ing to the vibrating bar rr;nr;r1~ strikes the upper e~ge of the inner bore. As stated, accor-ding to the invention optiona31y a central area of the inner bore corres-35 ponds to the external diAmeter of the implant post and, if the central areais located L.~ ' rAlly in the lnn~;h~linAl centre, the ' ' ~iAtP
element is built up in a ~ _lPtPly L, ' rAl manner and c2n be fitted Z~038~5 in hoth directions, whereAs in the case where the central area is ",,~. ' '~'Al with respect to the lnn~ih~;nAl centre of the ~;A~
element, as a function of the i~l ';A~ element fitting direction different lateral PlARticity and dAmping ~ Rt;~'R of the .
5 element are At~A;nAhl~.
Further features and ~lV~ILay~ of the invention can he gathered fr~n the follawing description of eni~cdiments and with reference to the attached drawings, wherein show:
Fig. 1 A first embodiment of the enoRsal implant according to the invention in a lnn~;hl~l;nAl sectiQn thraugh the median longi-hldinal axis of the implant post.
15 Fig. 2 Another ' of the enossal implant.
Fig. 3 An ;~ of an ;A~ element mcdified ca~ared with the implant of fig. 2.
0 Fig. 4 The ';A~' element CQre Qf the illl ';Al-f' element of fig. 3.
Fig. 5 A maiified I ' L of an ;~ element usable in nnnn~t; nn with the implant of the ' I of f ig . 2 .
Fig. 6 The intermediate element core of the ill~ ';A1'f' element of fig. 5, the 1~lc~lL~Lion as in figs. 3, 4 and 5 ~ L~.~l;n~
to a lnn~;hl-l;nAl sectiQn through the median lnn~;h~l;nAl axis of the interTIediate element.
As sh~wn in fig. 1, in the present ~wl the implant has a titanium basic struch~lre 10, which is coated on its auter face caning into contact with the h~dy tissue ~ith hydrQxyl apatite. The function of this hasic struch~re is the same as that of the enossal impl~nt of ~P OS-0 216 031, 35 to which reference shauld be made fQr further illustratiQn of the aQeratian, e.g. the brealcs in the hasic structure 10. A titanium spacer slseve 12 is screwed into the basic struchlre 10. Spacer sleeve 12 engages with a shallder 14 on the upper edge of basic structure 10 in the manner apparent fram the drawing. It is closed at the lcwer end facing the basic structure 10 and has at its lawer, closed end an inner bore provided with an internal thread. A centring collAr is formed by a widening 16 on the upper end of 5 spacer sleeve 12. The ~ Lial surface of spacer sLeeve 12 o~ming into cantact with the bcdy tissue is coated with bcdy tissue-friendly hydroxyl apatite, in the same way a6 ~asic structure 10. An elastic inter-meiiate eLement 18 ma~e frcm polyaxymethylene is inserted in the widening 16 of spacer sleeve 12 and its inner bore in the la~er region facing 10 spacer sleeve 12 has an internal diameter substantially ~I" ~L~"~l;n~ to the external diametPr of a titanium irt!plant post 20. Hawever, its upper bore region is much wider than the external diameter of implant post 20.
The latter is also prcvided at its lawer end facing basic structure 10 with an external thread by means of which it can be screwed into the 15 ~ l;ng internal th~e~ of the spacOE sleeve 12. Iui ';Al~P
element 18 engages with a ring shoulder 24 an the upper e~ge of spacer sleeve 12. On a bearing shoulder 26 of the ' ~;A~P element facing ring shoulder 24 engages a Lawer bearing face of a denture 28. The implant post provided at its upper end with a plastic envelape 30 presses 20 the bearing face of denture 28 against the bearing shoulder 26 of the elastic i,i 'iAtP element 18.
It is important in the above-described ....~1",. 1 ;~n that the implant post 20 freely traverses the upper regian 22 of the inner bore af the elastic ~iAtP element 18, i.e. withaut engaging an the inner wall of the inner bore of said ' ~;A~P element 18. As a functian of the screwing-in depth of implant post 20 or as a function af the heightwise ~;~Llu~:Lian, f~nq;f~PrPr~ in the axial di~ectian of the implant post 20, of the upper~
region 22 of the elastic i,~i 'iAt'P element 18, that height area in 30 which the implant post 20 "freely" traverses the in~ ';Atf' element 18 is adjustable. As a functian of the height of the upper area 22 of inter-mediate eLement 18, in which the implant post 20 does not engage an the inner waLL of the bare of i! ' ';AtP element 18, the rigidity of the "vihrating rcd~ farlT~ by inplant post 20 is higher ar 10wer. With 35 respect to the implant past 20, the denture 28 is mounted in an e_sily li~)lA~'~'AhlP or verticaLLy resilient manner; it being possible to mcdify the Length of the implant post 20 to adapt to the particular ~installatian ~ g height". This is either braught abGut by il l~.L~ a (`1~ L~ l;n~
plastic ring or a ~ l;n~ construction of the plastic envel~Ge 30.
Plastic envelope 30 always prevents an Pl~r;c~lly :~u~;Liv~ caltact between denture 28 and implant post 20, so that it is ensured that the 5 denture 28 is electrically insulate~ against the basic structure 10. This prevents harmful creeping currents, which can lead to corrosion and the like. In addition, denture 28 is elAstically resiLiently mounted in all directions with respect to basic structure 10. This is firstly ensured by the vibrating rcd action of implant post 20 and also by the elastic lO dAmplng acting against vertical forces in the axial direction of implant post 20 brought about by the ';R~f' element 18. The elAsticity or ~Iffh;(~n;n~ ensured by ;A~P el~5nent 18 can also be varied by tight-ening the implant post 20 with different tor~ues.
15 A8 showln in fig. 2, in the r~r~l~~r~l ~ the implant has a titanium basic str~lcture 10, which is coated on its outer face coming into cantact with the body tissue with hydraxyl apatite. The function of this basic structure ~ . to that of the enoss~l implant according to EP OS-0 216 031, to which reference shGuld be m~e for further ~lAnA~ n 20 of the basic structure lO. Into the basic structure 10 is screwed a t;tanium spacOE sleeve 12. A shallder 14 of spacOE sleeve 12 engages an the UppOE edge of basic structure 10 in the mannOE sh~n in the drawing.
It is cLosed at its lower end facing the basic structure 10 and ~as at it3 la~er, closed end an interna~ly threAded innOE bore. A centring collAr is 25 formed by a widening 16 at the upper end of the spacOE sleeve 12. The c~ ~ Lial surface of the spacOE sleeve 12 caning into contact with the body tissue is coated with bGdy tis8ue-friendly hydroxyl apatite in the sAme way as basic structure 10.
30 An elastic u-~ ';Ate element 18 is insOEted in widening 16 of spaCOE
sleeve 12 and is m~de fran a rigid, hard in~ ';At~' element care 18a of titanium and a relatively flexible elastic i ~;A~ element sleeve 18b of polyulc:U~Ie. In the lGwer regian facing spaCOE sleeve 16, the innOE
bare of the ';A~P element core 18a ha8 an internal diametOE, which 35 sub8tantially ~ lff to the external diametOE of a titanium implant post 16. HGwevOE, in the Up,GOE bore regian it is made much widOE than the Z0038~5 external dianeter of implant post 20. On its lower en~ facing the basic structure 10, the ilTlplant post 20 has an external threAd, by means of which it cAn be screwed into the ~ L~ J internaL thread of the spacer sleeve 12. T ' ';AtP element 18 engageg with a ring shoulder 24 on 5 the upper edge of spacer sleeve 12. A lower bearing face of a denture 28 engages with a bearing shoulder 26 of the ill~ 'iAte element facing the ring shoulder 24 and at its upper end the implant post, prwided with a plastic envel~e 30, presses the bearing face of denture 28 against the bearing shculder 26 of the elastic; ' ~iAtP eLement 18.
With regards to the aperatian of the above-described uw~Llu~:Lian, including the cllvallLaycs of the ' '' ~ sh~n in fig. 2, reference should be made to the descriptian of the embcdiment of fig. 1, unless the ~LluuLion of the iUI~ ~;At~ element 18 as an ' ' ~;AtP el~nent oore 18a and, ~;At~ element gleeve 18b is involvei. Fig. 1 shows in o~nnection with the i!l~ ~;AtP element 18 that the i~ ;AtP eLement core 18a has a collar 32, which serves to keep the ' ' ';AtP element sleeve 18b, preferably prcduced by injectian moulding, fir,rLLy engaged on the ill' ~;Ato el~nent core 18a.
In the ' '' ' according to fig. 3 the i-~ ~;AtP element 18 ance again has a titanium ill' 'iAt~ element core 18a, whose collar 32 is ~Llu~Ltd in such a way that An undercut is formed, which is undercut by the polyurethane sleeve 18b applied by injectian mculding. I;ig. 4 25 shows the constructian of the ' ' ~iAtP element core 18a with its collAr 32 and its undercut.
The ' '' ' of the ini 'iAtP element according to figs. 5 and 6 is mcdified c0~pAred with those af figs. 3 and 4 in that the ' ' 'iAto 30 element core 18a hAs in its central regi~n 34 in the direction of the median lnn~hl~linAl axis a s~Ller internal diameter, which in this regian essentially ~ to the external diameter of irrpLant post 20 (fig. 2). The centraL regian 34 is e~uidistant fr~n the upper and Lower end face, as s~wn in the drawings, 80 that the in' 'iAtP element 18 can be install~ in the implant in bath directions without changing the harizantal elasticity ~ I,, ,- 1, iqtiCs. NaturaLLy an ' '' L is alJ;a ~ 201[)3835 possible in which the central region 34 is arranged c_, nAlly with respect to the median lQn~ihl~inAl axis of the intermediate elenent 18 and then different h~r;7rn~Al elasticity ~ c~,LeListics ~ould be obtained as a function of the fitting direction of ~li ';Ate elenent 18.
As a result of the inventive construction of the illl ';Ate el~nent 18,nanely su~divided into two, , i ', i.e. the hArd ' ~ 'iAlLP elenent core 18a and the flexible elastic illt ';A1'~ el~ment sleeve 18b, it is ensured that in the cAse of vertical stressing in the vicinity of ring 10 shoulder Z4 and b~ing shoulder 26 relatively flexible elastic plastics material is available, which ensures a ~A~i~fAn~l~ry vertical .l,f"r-~l ;nn, whilst I l~An~l~ly the hard ~aterial of the i~l~ ';A1-~' el~nent core 18a prevents an lm~l~q;rAhly rrnn~m~l lateral rlofl~f;~n in the case of LLall:,v~ stressing by bending of the impl~nt post.
The features of the invention disclosed in the d~l~Li~l, drawings and clairns can be essential to the different o ` ' Lli thereof both singly and in the fo~n of, ' ;nA~;nn~ .
Claims (23)
1. An enossal implant comprising a basic structure for snugly receiving in a bore in a jaw of a patient, said basic structure having a threaded bore surrounded by an annular shoulder at an upper end, a spacing element being composed of metal and having external threads for securing the spacing element in the threaded bore of the basic structure with a first annular shoulder of the spacing element engaging the annular shoulder of said basic element, said spacing element having an axial bore with a threaded portion and a counterbore adjacent the end opposite a closed end of the spacing element forming a second annular shoulder, an intermediate element being inserted in said counterbore and having a ring shoulder engaging said second annular shoulder of the spacing element, said intermediate element having at least a portion of the bore of a diameter greater than an external diameter of said implant post, said ring shoulder of the intermediate element being of a plastic material having an annular surface engageable by a bearing face of a denture secured by said post on said base structure .
2. An implant according to claim 1, wherein the amount of threading-in of the implant post into the spacer element is adjustable.
3. An implant according to claim 1, wherein the implant post has a plastic envelope in the area coming in contact with said denture.
4. An implant post according to claim 1, wherein the denture is mounted elastically on the implant post.
5. An implant according to claim 4, wherein the elastic mounting of the denture on said post includes a plastic ring interposed therebetween.
6. An implant according to claim 1, wherein the denture is elastically mounted on the implant post by a plastic envelope at a head of said implant post.
7. An implant according to claim 1, wherein the counterbore of the spacer element receiving the intermediate element in a flush manner has a conical expansion to form a frusto conical cross section.
8. An implant according to claim 1, wherein the implant post can be threaded into the spacer element with an adjustable torque .
9. An implant according to claim 1, wherein all exposed surfaces of the basic structure and the spacer element are coated with a hydroxylapatite.
10. An implant according to claim 1, wherein the implant post can be coated with an adhesive at the lower end of the vicintiy of its external threads.
11. An implant according to claim 1, wherein the intermediate element is completely made of an elastic material, said elastic material being a plastic, and the inner bore of the intermediate element has a portion of a diameter corresponding to the external diameter of the implant post being provided adjacent the spacer element so that the portion of the bore having the larger external diameter is adjacent the denture.
12. An implant according to claim 1, wherein the intermediate element is composed of a core element for surrounding the implant post made of a relatively rigid material, and a sleeve element made of a relatively soft elastic material surrounding the core element in the area of the ring shoulder .
13. An implant according to claim 12, wherein the core element is made from a rigid plastic selected from polyoxymethylene .
14. An implant according to claim 12, wherein the intermediate core is made of a metal.
15. An implant according to claim 14, wherein the core element is made from titanium.
16. An implant according to claim 12, wherein the sleeve element is made of a flexible plastic polyurethane.
17. An implant according to claim 12, wherein the core element has a sleeve-like construction and a collar is provided in the vicinity of the ring shoulder and bearing shoulder.
18. An implant according to claim 17, wherein the sleeve element is positively connected to the intermediate core element.
19. An implant according to claim 17, wherein the collar has an undercut.
20. An implant according to claim 17, wherein the sleeve element is shaped by injection molding process on the core element .
21. An implant according to claim 12, wherein the core element has an inner bore with a central region in the vicinity of the ring shoulder having an internal diameter corresponding to the external diameter of the implant post.
22. An implant according to claim 21, wherein the central region of the small internal diameter is equidistant from the end faces of the intermediate element.
23. An implant according to claim 21, wherein the central region of a smaller internal diameter has a varying spacing from the end faces of the intermediate element.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3839724A DE3839724A1 (en) | 1988-11-24 | 1988-11-24 | Intraosseous implant having an elastic intermediate element |
| DEP3839724.2-35 | 1988-11-24 | ||
| DEP3909580.0-35 | 1989-03-23 | ||
| DE3909580A DE3909580A1 (en) | 1988-11-24 | 1989-03-23 | ENOSSAL IMPLANT WITH ELASTIC INTERMEDIATE ELEMENT AND METAL DISTANCE SLEEVE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2003835A1 CA2003835A1 (en) | 1990-05-24 |
| CA2003835C true CA2003835C (en) | 1996-08-06 |
Family
ID=25874507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002003835A Expired - Fee Related CA2003835C (en) | 1988-11-24 | 1989-11-24 | Enossal implant with an elastic intermediate element and metal spacer sleeve |
Country Status (13)
| Country | Link |
|---|---|
| US (1) | US5026280A (en) |
| EP (1) | EP0370590B1 (en) |
| JP (1) | JPH02220642A (en) |
| KR (1) | KR970010578B1 (en) |
| CN (1) | CN1017308B (en) |
| AU (1) | AU619619B2 (en) |
| CA (1) | CA2003835C (en) |
| DE (2) | DE3909580A1 (en) |
| ES (1) | ES2041403T3 (en) |
| HK (1) | HK142493A (en) |
| HU (1) | HU213337B (en) |
| IL (1) | IL92360A (en) |
| RU (1) | RU2061437C1 (en) |
Families Citing this family (59)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2635964A1 (en) * | 1988-09-02 | 1990-03-09 | Poulmaire Francis | System which can be implanted with or without resilience, rotary device for producing the implant housing and method for using the implantable system |
| US5135395A (en) * | 1990-07-05 | 1992-08-04 | Marlin Gerald M | Implant collar and post system |
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-
1989
- 1989-03-23 DE DE3909580A patent/DE3909580A1/en active Granted
- 1989-11-17 EP EP89250090A patent/EP0370590B1/en not_active Expired - Lifetime
- 1989-11-17 DE DE8989250090T patent/DE58904495D1/en not_active Expired - Fee Related
- 1989-11-17 ES ES198989250090T patent/ES2041403T3/en not_active Expired - Lifetime
- 1989-11-20 AU AU45323/89A patent/AU619619B2/en not_active Ceased
- 1989-11-20 IL IL9236089A patent/IL92360A/en not_active IP Right Cessation
- 1989-11-22 US US07/440,257 patent/US5026280A/en not_active Expired - Fee Related
- 1989-11-23 RU SU894742520A patent/RU2061437C1/en not_active IP Right Cessation
- 1989-11-23 HU HU896153A patent/HU213337B/en not_active IP Right Cessation
- 1989-11-24 KR KR1019890017114A patent/KR970010578B1/en not_active IP Right Cessation
- 1989-11-24 JP JP1303439A patent/JPH02220642A/en active Granted
- 1989-11-24 CN CN89109548A patent/CN1017308B/en not_active Expired
- 1989-11-24 CA CA002003835A patent/CA2003835C/en not_active Expired - Fee Related
-
1993
- 1993-12-30 HK HK1424/93A patent/HK142493A/en not_active IP Right Cessation
Also Published As
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|---|---|
| DE58904495D1 (en) | 1993-07-01 |
| AU619619B2 (en) | 1992-01-30 |
| JPH02220642A (en) | 1990-09-03 |
| ES2041403T3 (en) | 1993-11-16 |
| AU4532389A (en) | 1990-05-31 |
| HU896153D0 (en) | 1990-02-28 |
| IL92360A (en) | 1994-07-31 |
| JPH0450825B2 (en) | 1992-08-17 |
| IL92360A0 (en) | 1990-07-26 |
| HU213337B (en) | 1997-05-28 |
| RU2061437C1 (en) | 1996-06-10 |
| CN1017308B (en) | 1992-07-08 |
| EP0370590B1 (en) | 1993-05-26 |
| EP0370590A2 (en) | 1990-05-30 |
| CN1045346A (en) | 1990-09-19 |
| EP0370590A3 (en) | 1991-01-09 |
| KR900007385A (en) | 1990-06-01 |
| US5026280A (en) | 1991-06-25 |
| CA2003835A1 (en) | 1990-05-24 |
| HUT51887A (en) | 1990-06-28 |
| HK142493A (en) | 1994-01-07 |
| KR970010578B1 (en) | 1997-06-28 |
| DE3909580A1 (en) | 1990-10-18 |
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| EEER | Examination request | ||
| MKLA | Lapsed |