CA2232564C - Endosseus single-tooth implant with anti-rotation device - Google Patents
Endosseus single-tooth implant with anti-rotation device Download PDFInfo
- Publication number
- CA2232564C CA2232564C CA002232564A CA2232564A CA2232564C CA 2232564 C CA2232564 C CA 2232564C CA 002232564 A CA002232564 A CA 002232564A CA 2232564 A CA2232564 A CA 2232564A CA 2232564 C CA2232564 C CA 2232564C
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- CA
- Canada
- Prior art keywords
- basic body
- single tooth
- tooth implant
- coronal
- blind bore
- 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
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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
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L7/00—Cereal-derived products; Malt products; Preparation or treatment thereof
- A23L7/10—Cereal-derived products
- A23L7/109—Types of pasta, e.g. macaroni or noodles
- A23L7/11—Filled, stuffed or multilayered pasta
-
- 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
- A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
- A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
-
- 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
- A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
- A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
- A61C8/0054—Connecting devices for joining an upper structure with an implant member, e.g. spacers having a cylindrical implant connecting part
-
- 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
- A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
- A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
- A61C8/0066—Connecting devices for joining an upper structure with an implant member, e.g. spacers with positioning means
-
- 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
- A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
- A61C8/0077—Connecting the upper structure to the implant, e.g. bridging bars with shape following the gingival surface or the bone surface
-
- 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
- A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
- A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
- A61C8/0069—Connecting devices for joining an upper structure with an implant member, e.g. spacers tapered or conical connection
Abstract
The invention concerns an endosseus single-tooth implant for a fixed dental prosthesis, the implant comprising: a substantially cylindrical basic body which can be inserted into a bore in a jaw bone and has a blind hole open towards the coronal end thereof; a spacer sleeve which can be placed on the coronal front edge of the basic body; an implant post which can be inserted into the blind hole in the basic body and connected thereto and penetrates a n internal bore in the spacer sleeve; a connection device for securing the spacer sleeve on the basic body such that said sleeve cannot rotate; and a securing head for the dental prosthesis. The implant is characterized in tha t the securing head is formed by a coronal hollow end region of the spacer sleeve; the coronal end of the implant post is disposed cervically below the end region; and, in order to secure the dental prosthesis, a securing screw, which penetrates an opening in the peripheral wall of the end region, can be screwed into an insert nut which is provided with a threaded bore extending perpendicular to the longitudinal centre axis of the spacer sleeve and is disposed in the end region.
Description
CA 02232~64 1998-03-19 ENDO8SEUS SINGLE-TOOTH IMPhANT WITH ANTI-ROTATION DEVICE
BACKGROUND OF THE INVENTION
The present invention is directed to an enossal single tooth implant for tightly fitting a dental prosthesis which implant includes a base body, that is insertable in a bore made in a jawbone and a spacing sleeve attachable to the base body. The base body has a blind bore open on one end which is a coronal end and closed at the opposite end. The spacing sleeve is attachable in a twisting prevented manner to the coronal end of the base body and has a reduced diameter centering collar which is insertable into the hollow cylindrical annular recess formed by a blind bore in the base body adjacent the coronal encl while a shoulder of the sleeve is received on the outer edge of the body at the coronal end.
The spacing sleeve has a bore that extends through the centering collar and is open on its coronal end for the reception of an implant post. The connection device for the twist preventing connection of the spacing sleeve is formed with the hollow cylindrical annular recess of the basic body having at least one circumferentially acting basic body positive connection element and the centering collar of the spacing sleeve has at least one spacing sleeve positive connecting element complimentary to the basic body positive connecting elements. The implant post will directly or indirectly be insertable into the blind bore of the base and at least partially traverse the spacing sleeve and the fastening head for the dental prosthesis.
In a single tooth implant of this type such as disclosed in U.S. Patent 5,125,840, whose disclosure is incorporated by reference thereto and which claims priority for German application 4 028 885 and from German patent application P 195 09 762.9-32, the twisting prevention was undertaken in that the basic body had positive connecting elements which were provided on the bottom of an annular recess of the basic body and the spacing sleeve positively CA 02232~64 1998-03-19 connecting elements which were complimentary thereto are on the lower front edge of the centering collar of the spacing sleeve. From a manufacturing standpoint such positive connection elements are relatively difficult to produce. In certain uses, the location of these positive connection elements was undesirable since the full depth of the annular recess or the full length of the centering collar is not available for centering, fixing and securing of the spacing sleeve relative to the basic body.
In U.S. Patent No. 4,960,381, other difficulties of a similar nature occur in the enossal dental implant. The difficulties are due to the fact that the positive connection elements of the basic body are spaced from the coronal front edge within a blind bore of the basic body.
SUMMARY OF THE INVENTION
The object of the present invention is to develop a single tooth implant wherein the case of improved manufacturing possibilities and even precise guidance and centering of the spacing sleeve in the basic body is ensured.
To accomplish these objects, the present invention is directed to a single tooth implant having a basic body, a spacing sleeve and means for preventing twisting therebetween. The basic body has a blind bore forming a coronal end for the body and has a positive connection area adjacent the coronal end followed by a guide portion with a cylindrical surface and then a centering area with a diameter smaller than the cylindrical surface of the guide portion.
The spacing sleeve has a fastening end spaced from a plug portion by an annular shoulder. The plug portion adjacent the shoulder has a positive connecting portion on a cylindrical portion followed by a guidance portion with a cylindrical surface and a centering portion with a cylindrical surface with a smaller diameter than the cylindrical surface of the guidance portion. The diameter of the cylindrical surface of the guidance portion matches the CA 02232~64 1998-03-19 diameter of the guide portion of the blind bore while the diameter of the centering portion matches the diameter of the centering area of the blind bore. The means for preventing twisting includes positive connecting elements in the positive connecting portion and positive connecting area with the elements including at least one groove and at least one projection receivable in the groove when the plug portion is inserted into the blind bore with the annular shoulder engaging the end face of the coronal end.
The centering body of the basic body can be provided with internal threads. The invention optionally provides for the internal threads being cervically connected to the centering area of the basic body and the threads are disposed inward toward the closed end of the basic body.
Another embodiment of the invention is characterized in that the implant post completely traverses the spacing sleeve and can be screwed into internal threads close to a cervical or closed end of the basic body.
It is also possible according to the invention for at least one of the basic body positive connection elements to have the form of a coronally open positive connection groove extending parallel to the ]ongitudinal axis of the basic body.
The invention also proposes that the positive connection grooves have in a radial plane, which extends perpendicular to the axis of the bore, a basic substantial circular segmental cross section. The positive connection grooves can have a substantially triangular cross section in a radial plane which extends perpendicular to the axis of the bore in the basic body. The invention optionally proposes that the positive connection grooves in a radial plane which extends perpendicular to the axis of the bore in the basic body has an approximately rectangular-curved cross section.
According to the invention the positive connection grooves can be opened toward the closed or cervical end.
It is also possible according to the present invention for the positive connection grooves to have a decreasing CA 02232~64 1998-03-19 cross section from adjacent the coronal end towards the closed end of the basic body. The invention also proposes the cross section of the positive connection grooves decreases radially from the coronal and to the closed end of the basic body.
The basic body connection elements can have a 30~
spacing with respect to the basic body circumference.
The invention also proposes that the basic body positive connection elements have a 60~ spacing with respect to the basic body circumference.
According to the invention it is also possible for the number of positive connection elements of the spacing sleeve to be smaller than the number of positive connection elements of the basic body.
Another embodiment of the invention is characterized in that the positive connection area of the basic body has an annular undercut between the positive connection elements of the basic body and the guidance area.
It is also possible according to the present invention for the end wall at the coronal end of the basic body to have a bevel or chamfer tapering conically inward from the front edge of the basic body into the vicinity of the basic body positive connection elements.
The invention also proposes the positive connecting portion of the centering collar has an annular undercut between the shoulder and the connection elements.
The invention is based on the surprising finding that it is possible to improve a single tooth implant which has proved satisfactory in practice in that the positive connection elements of the basic body are positioned directly adjacent to or at the coronal front edge and with the corresponding arrangement and construction of the spacing sleeve positive connection elements complimentary thereto.
Due to the fact that the complete depth of the annular recess of the basic body is available for the centering and guidance of the spacing sleeve there is a significantly improved stability of the connection between the spacing sleeve and CA 02232~64 1998-03-19 basic body. Moreover, the arrangement of the positive connecting elements in the circumferential wall of the annular recess formed by the blind bore of the basic body or the centering collar of the spacing sleeve allows a greater design freedom with regard to the nature of the spacing and also the shaping of the positive connecting elements.
Other advantages and features will be readily available from the following description of the preferred embodiments, the drawings and claims.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a partial longitudinal cross sectional view with portions in elevation for purposes of illustration of a basic body of an enossal single tooth implant according to the present invention;
Figure 2 is a partial cross sectional view with portions in elevations for purpose of illustration of a spacing sleeve with a fastening head for a dental prosthesis for the single tooth implant of Figure 1;
Figure 3a is an end view of the basic body of Figure l;
Figure 3b is an end view of a spacing sleeve of Figure 2;
Figure 4a is an end view of a first modification of the basic body of Figure l;
Figure 4b is an end view of a first modification of the spacing sleeve of Figure 2;
Figure 5a is an end view of the second modification of the basic body of Figure 1; and Figure 5b is a second modification of the spacer sleeve of Figure 2.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The principles of the present invention are particularly useful when incorporated into a single tooth CA 02232~64 1998-03-19 implant of an embodiment of the basic body generally indicated at 10 in Figure 1 which acts with a spacing sleeve generally indicated at 32 in Figure 2. The basic body 10 is of a known type such as disclosed in the above-mentioned U.S.
Patent 5,125,840.
The basic body 10, which is closed at its one end or cervical end which is at the bottom of Figure 1 has towards a coronal end at the top an open blind bore 11. Near the closed end, the blind bore 11 is provided with internal threads 12 with a relatively small diameter in which can be screwed an implant post which is not shown in Figure 1 and which will be discussed hereinafter. To the internal threads 12 of the basic body 10 is connected in the coronal direction an annular cylindrical portion 14 with a larger diameter than the internal threads 12. The annular or cylindrical portion 14 has internal threads 18 and forms a centering area 16 which is connected to the internal threads 12. To the centering area 16 of the cylindrical portion 14 is coronally connected a guidance area 20 which is a cylindrical larger diameter portion than the centering area 16 and has a smooth, hollow cylindrical inner wall 21. From the guidance area 20 to the coronal front edge 22 of the basic body 10 is a positive connection area 24 of the bore 11 in which there are several positive connecting elements in the form of axially extending grooves 26 in an inner wall 27. From the front edge 22 to the positive connecting area 24 of the bore 11 has a bevel or chamfer 28 tapering conically in the direction of the cervical or closed end and extending into the vicinity of the positive connecting grooves 26. Between the guidance area 20 and the positive connecting elements or groove 26 there is an annular undercut 30 which facilitates a chip deposition-free production of the positive connecting elements or grooves 26.
The spacing sleeve 32 as shown in Figure 2 serves in this manner described in the German patent application P 195 09 762.9-32 and has a fastening head for a not shown, tightly fitting dental prosthesis and is provided with an all around CA 02232~64 1998-03-19 attachment shoulder 34 for the prosthesis which may be a crown of a tooth. The spacing sleeve 32 has an annular shoulder 36 which connects the fastening end to a stub or plug portion which is received in the blind bore 11 of the basic body 10. The stub or plug portion has immediately adjacent the shoulder 36 a positive connection portion 38 followed by a guidance portion 40 and a centering portion 42 which will be received in the blind bore with the shoulder 36 engaging the front edge 22. The positive connection area 38 has a plurality of axially directed positive connection noses 46 whose shape and arrangement but not necessarily the number corresponds to the positive connection grooves 26 of the basic body 10. The positive connection area 38 of the spacing sleeve 32 is provided with an annular undercut 48 between the shoulder 36 and the positive connecting noses 46 and this facilitates the chip deposition during manufacture of the positive connecting noses 46.
When inserting the spacing sleeve 32, which is provided with the axial longitudinal bore 33 whose internal diameter corresponds to the external diameter of a not shown implant post, is inserted in the basic body 10, the centering portion 42, which is formed by a cylindrical centering collar 44, will be engaged in the centering area 16 of the annular portion 14 so that a smooth cylindrical circumferential surface of the centering portion 42 comes to rest on the inner boundaries of the internal threads 18 of the centering area 16 of the basic body 10. At the same time, the guidance portion 40 of the spacing sleeve 32 is located with a press fit in the guidance area 22 of the basic body 10 and the positive connection noses 42 engage in the positive connection grooves 26 while the shoulder 36 comes to rest on the front edge 22. Therefore, the spacing sleeve 32 is connected to the basic body 40 in a twist preventing manner.
By means of the implant post traversing the spacing sleeve 32 and being screwed into the internal threads 12 of the basic body 10, the spacing sleeve 32 can be firmly connected to the basic body 10. In an embodiment other than those shown in CA 02232~64 1998-03-19 Figure 1 and 2 the internal threads 18 of the basic body 10 can have a different constructed spacing sleeve for threading in for example a two part sleeve as is shown in the above mentioned U.S. Patent 5,125,840.
As shown in Figure 3a, the positive connecting area of the basic body 10 has six equally spaced, axial positive connecting grooves 26 which in the represented embodiment have a cross sectional shape of a rectangle with a substantially tangential directed but also curved longitudinal edges and have an annular spacing of 60~ between centers of adjacent grooves. In Figure 3b, the spacing sleeve 32 in the embodiment of Figures 1 and 2 is provided with six equally spaced, axial positive connecting noses 46.
In the embodiments of Figures 4a and 4b, the basic body 10' in Figure 4a has twelve positive connecting grooves 26' with an equal annular spacing of 30~ and in Figure 4b the spacing sleeve 32' is only provided with four positive connecting noses 46'. The positive connecting grooves 26' and the positive connecting noses 46' have in this case a triangular cross section in a plane perpendicular to the longitudinal axes of the basic body and of the spacing sleeve. It is pointed out that the spacing sleeve 32' has only four positive connecting noses 46 which have a 90~ annular spacing therebetween.
In the embodiment of Figures 5a and 5b, the basic body 10" of Figure 5a has twelve positive connecting grooves 26"
with a 30~ spacing and the grooves 26" have a circular segmental cross section in a plane perpendicular to the longitudinal axis of the basic body 10". According to Figure 5a, the spacing sleeve 32" is provided with six positive connecting noses 46" each having a corresponding cross section to the cross section of the grooves 26".
As a function of the spacing or the spacing ratio of the basic body 10' and 10" relative to the spacing sleeves 32' and 32", the spacing sleeves 32' and 32" can be inserted in different rotational positions within their respective basic bodies 10' and 10". Thus, the treating surgeon has a CA 02232~64 1998-03-19 number of desired positions available to him as far as orienting the spacing sleeve such as 32' relative to the basic body 10'.
Although modifications and changes may be suggested by those versed in the art, it should be understood that we wish to embody within the scope of the patent granted herein all such modifications that reasonably and properly come within the scope of our contribution to the art.
BACKGROUND OF THE INVENTION
The present invention is directed to an enossal single tooth implant for tightly fitting a dental prosthesis which implant includes a base body, that is insertable in a bore made in a jawbone and a spacing sleeve attachable to the base body. The base body has a blind bore open on one end which is a coronal end and closed at the opposite end. The spacing sleeve is attachable in a twisting prevented manner to the coronal end of the base body and has a reduced diameter centering collar which is insertable into the hollow cylindrical annular recess formed by a blind bore in the base body adjacent the coronal encl while a shoulder of the sleeve is received on the outer edge of the body at the coronal end.
The spacing sleeve has a bore that extends through the centering collar and is open on its coronal end for the reception of an implant post. The connection device for the twist preventing connection of the spacing sleeve is formed with the hollow cylindrical annular recess of the basic body having at least one circumferentially acting basic body positive connection element and the centering collar of the spacing sleeve has at least one spacing sleeve positive connecting element complimentary to the basic body positive connecting elements. The implant post will directly or indirectly be insertable into the blind bore of the base and at least partially traverse the spacing sleeve and the fastening head for the dental prosthesis.
In a single tooth implant of this type such as disclosed in U.S. Patent 5,125,840, whose disclosure is incorporated by reference thereto and which claims priority for German application 4 028 885 and from German patent application P 195 09 762.9-32, the twisting prevention was undertaken in that the basic body had positive connecting elements which were provided on the bottom of an annular recess of the basic body and the spacing sleeve positively CA 02232~64 1998-03-19 connecting elements which were complimentary thereto are on the lower front edge of the centering collar of the spacing sleeve. From a manufacturing standpoint such positive connection elements are relatively difficult to produce. In certain uses, the location of these positive connection elements was undesirable since the full depth of the annular recess or the full length of the centering collar is not available for centering, fixing and securing of the spacing sleeve relative to the basic body.
In U.S. Patent No. 4,960,381, other difficulties of a similar nature occur in the enossal dental implant. The difficulties are due to the fact that the positive connection elements of the basic body are spaced from the coronal front edge within a blind bore of the basic body.
SUMMARY OF THE INVENTION
The object of the present invention is to develop a single tooth implant wherein the case of improved manufacturing possibilities and even precise guidance and centering of the spacing sleeve in the basic body is ensured.
To accomplish these objects, the present invention is directed to a single tooth implant having a basic body, a spacing sleeve and means for preventing twisting therebetween. The basic body has a blind bore forming a coronal end for the body and has a positive connection area adjacent the coronal end followed by a guide portion with a cylindrical surface and then a centering area with a diameter smaller than the cylindrical surface of the guide portion.
The spacing sleeve has a fastening end spaced from a plug portion by an annular shoulder. The plug portion adjacent the shoulder has a positive connecting portion on a cylindrical portion followed by a guidance portion with a cylindrical surface and a centering portion with a cylindrical surface with a smaller diameter than the cylindrical surface of the guidance portion. The diameter of the cylindrical surface of the guidance portion matches the CA 02232~64 1998-03-19 diameter of the guide portion of the blind bore while the diameter of the centering portion matches the diameter of the centering area of the blind bore. The means for preventing twisting includes positive connecting elements in the positive connecting portion and positive connecting area with the elements including at least one groove and at least one projection receivable in the groove when the plug portion is inserted into the blind bore with the annular shoulder engaging the end face of the coronal end.
The centering body of the basic body can be provided with internal threads. The invention optionally provides for the internal threads being cervically connected to the centering area of the basic body and the threads are disposed inward toward the closed end of the basic body.
Another embodiment of the invention is characterized in that the implant post completely traverses the spacing sleeve and can be screwed into internal threads close to a cervical or closed end of the basic body.
It is also possible according to the invention for at least one of the basic body positive connection elements to have the form of a coronally open positive connection groove extending parallel to the ]ongitudinal axis of the basic body.
The invention also proposes that the positive connection grooves have in a radial plane, which extends perpendicular to the axis of the bore, a basic substantial circular segmental cross section. The positive connection grooves can have a substantially triangular cross section in a radial plane which extends perpendicular to the axis of the bore in the basic body. The invention optionally proposes that the positive connection grooves in a radial plane which extends perpendicular to the axis of the bore in the basic body has an approximately rectangular-curved cross section.
According to the invention the positive connection grooves can be opened toward the closed or cervical end.
It is also possible according to the present invention for the positive connection grooves to have a decreasing CA 02232~64 1998-03-19 cross section from adjacent the coronal end towards the closed end of the basic body. The invention also proposes the cross section of the positive connection grooves decreases radially from the coronal and to the closed end of the basic body.
The basic body connection elements can have a 30~
spacing with respect to the basic body circumference.
The invention also proposes that the basic body positive connection elements have a 60~ spacing with respect to the basic body circumference.
According to the invention it is also possible for the number of positive connection elements of the spacing sleeve to be smaller than the number of positive connection elements of the basic body.
Another embodiment of the invention is characterized in that the positive connection area of the basic body has an annular undercut between the positive connection elements of the basic body and the guidance area.
It is also possible according to the present invention for the end wall at the coronal end of the basic body to have a bevel or chamfer tapering conically inward from the front edge of the basic body into the vicinity of the basic body positive connection elements.
The invention also proposes the positive connecting portion of the centering collar has an annular undercut between the shoulder and the connection elements.
The invention is based on the surprising finding that it is possible to improve a single tooth implant which has proved satisfactory in practice in that the positive connection elements of the basic body are positioned directly adjacent to or at the coronal front edge and with the corresponding arrangement and construction of the spacing sleeve positive connection elements complimentary thereto.
Due to the fact that the complete depth of the annular recess of the basic body is available for the centering and guidance of the spacing sleeve there is a significantly improved stability of the connection between the spacing sleeve and CA 02232~64 1998-03-19 basic body. Moreover, the arrangement of the positive connecting elements in the circumferential wall of the annular recess formed by the blind bore of the basic body or the centering collar of the spacing sleeve allows a greater design freedom with regard to the nature of the spacing and also the shaping of the positive connecting elements.
Other advantages and features will be readily available from the following description of the preferred embodiments, the drawings and claims.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a partial longitudinal cross sectional view with portions in elevation for purposes of illustration of a basic body of an enossal single tooth implant according to the present invention;
Figure 2 is a partial cross sectional view with portions in elevations for purpose of illustration of a spacing sleeve with a fastening head for a dental prosthesis for the single tooth implant of Figure 1;
Figure 3a is an end view of the basic body of Figure l;
Figure 3b is an end view of a spacing sleeve of Figure 2;
Figure 4a is an end view of a first modification of the basic body of Figure l;
Figure 4b is an end view of a first modification of the spacing sleeve of Figure 2;
Figure 5a is an end view of the second modification of the basic body of Figure 1; and Figure 5b is a second modification of the spacer sleeve of Figure 2.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The principles of the present invention are particularly useful when incorporated into a single tooth CA 02232~64 1998-03-19 implant of an embodiment of the basic body generally indicated at 10 in Figure 1 which acts with a spacing sleeve generally indicated at 32 in Figure 2. The basic body 10 is of a known type such as disclosed in the above-mentioned U.S.
Patent 5,125,840.
The basic body 10, which is closed at its one end or cervical end which is at the bottom of Figure 1 has towards a coronal end at the top an open blind bore 11. Near the closed end, the blind bore 11 is provided with internal threads 12 with a relatively small diameter in which can be screwed an implant post which is not shown in Figure 1 and which will be discussed hereinafter. To the internal threads 12 of the basic body 10 is connected in the coronal direction an annular cylindrical portion 14 with a larger diameter than the internal threads 12. The annular or cylindrical portion 14 has internal threads 18 and forms a centering area 16 which is connected to the internal threads 12. To the centering area 16 of the cylindrical portion 14 is coronally connected a guidance area 20 which is a cylindrical larger diameter portion than the centering area 16 and has a smooth, hollow cylindrical inner wall 21. From the guidance area 20 to the coronal front edge 22 of the basic body 10 is a positive connection area 24 of the bore 11 in which there are several positive connecting elements in the form of axially extending grooves 26 in an inner wall 27. From the front edge 22 to the positive connecting area 24 of the bore 11 has a bevel or chamfer 28 tapering conically in the direction of the cervical or closed end and extending into the vicinity of the positive connecting grooves 26. Between the guidance area 20 and the positive connecting elements or groove 26 there is an annular undercut 30 which facilitates a chip deposition-free production of the positive connecting elements or grooves 26.
The spacing sleeve 32 as shown in Figure 2 serves in this manner described in the German patent application P 195 09 762.9-32 and has a fastening head for a not shown, tightly fitting dental prosthesis and is provided with an all around CA 02232~64 1998-03-19 attachment shoulder 34 for the prosthesis which may be a crown of a tooth. The spacing sleeve 32 has an annular shoulder 36 which connects the fastening end to a stub or plug portion which is received in the blind bore 11 of the basic body 10. The stub or plug portion has immediately adjacent the shoulder 36 a positive connection portion 38 followed by a guidance portion 40 and a centering portion 42 which will be received in the blind bore with the shoulder 36 engaging the front edge 22. The positive connection area 38 has a plurality of axially directed positive connection noses 46 whose shape and arrangement but not necessarily the number corresponds to the positive connection grooves 26 of the basic body 10. The positive connection area 38 of the spacing sleeve 32 is provided with an annular undercut 48 between the shoulder 36 and the positive connecting noses 46 and this facilitates the chip deposition during manufacture of the positive connecting noses 46.
When inserting the spacing sleeve 32, which is provided with the axial longitudinal bore 33 whose internal diameter corresponds to the external diameter of a not shown implant post, is inserted in the basic body 10, the centering portion 42, which is formed by a cylindrical centering collar 44, will be engaged in the centering area 16 of the annular portion 14 so that a smooth cylindrical circumferential surface of the centering portion 42 comes to rest on the inner boundaries of the internal threads 18 of the centering area 16 of the basic body 10. At the same time, the guidance portion 40 of the spacing sleeve 32 is located with a press fit in the guidance area 22 of the basic body 10 and the positive connection noses 42 engage in the positive connection grooves 26 while the shoulder 36 comes to rest on the front edge 22. Therefore, the spacing sleeve 32 is connected to the basic body 40 in a twist preventing manner.
By means of the implant post traversing the spacing sleeve 32 and being screwed into the internal threads 12 of the basic body 10, the spacing sleeve 32 can be firmly connected to the basic body 10. In an embodiment other than those shown in CA 02232~64 1998-03-19 Figure 1 and 2 the internal threads 18 of the basic body 10 can have a different constructed spacing sleeve for threading in for example a two part sleeve as is shown in the above mentioned U.S. Patent 5,125,840.
As shown in Figure 3a, the positive connecting area of the basic body 10 has six equally spaced, axial positive connecting grooves 26 which in the represented embodiment have a cross sectional shape of a rectangle with a substantially tangential directed but also curved longitudinal edges and have an annular spacing of 60~ between centers of adjacent grooves. In Figure 3b, the spacing sleeve 32 in the embodiment of Figures 1 and 2 is provided with six equally spaced, axial positive connecting noses 46.
In the embodiments of Figures 4a and 4b, the basic body 10' in Figure 4a has twelve positive connecting grooves 26' with an equal annular spacing of 30~ and in Figure 4b the spacing sleeve 32' is only provided with four positive connecting noses 46'. The positive connecting grooves 26' and the positive connecting noses 46' have in this case a triangular cross section in a plane perpendicular to the longitudinal axes of the basic body and of the spacing sleeve. It is pointed out that the spacing sleeve 32' has only four positive connecting noses 46 which have a 90~ annular spacing therebetween.
In the embodiment of Figures 5a and 5b, the basic body 10" of Figure 5a has twelve positive connecting grooves 26"
with a 30~ spacing and the grooves 26" have a circular segmental cross section in a plane perpendicular to the longitudinal axis of the basic body 10". According to Figure 5a, the spacing sleeve 32" is provided with six positive connecting noses 46" each having a corresponding cross section to the cross section of the grooves 26".
As a function of the spacing or the spacing ratio of the basic body 10' and 10" relative to the spacing sleeves 32' and 32", the spacing sleeves 32' and 32" can be inserted in different rotational positions within their respective basic bodies 10' and 10". Thus, the treating surgeon has a CA 02232~64 1998-03-19 number of desired positions available to him as far as orienting the spacing sleeve such as 32' relative to the basic body 10'.
Although modifications and changes may be suggested by those versed in the art, it should be understood that we wish to embody within the scope of the patent granted herein all such modifications that reasonably and properly come within the scope of our contribution to the art.
Claims (17)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A single tooth implant for a tightly fitting dental prosthesis, said implant comprising a substantially cylindrical basic body insertable in a bore made in a jaw bone, said base body having an axially extending blind bore extending from one end towards a second end to provide the body with a closed end and said one end being a coronal end having a coronal front edge, a spacing sleeve being attachable to the coronal front edge of the basic body, and means for preventing twisting between the spacing sleeve and the basic body, said blind bore of said basic body adjacent the coronal end having a positive connection area with at least one connecting element followed by a guidance area of a cylindrical surface which merges into a centering area of a smaller diameter than the guidance area, said spacing sleeve having a plug portion separated from a fastening end for the prosthesis by an annular shoulder receivable on the coronal front edge when the sleeve is mounted on the basic body with the plug portion inserted into the blind bore, said plug portion adjacent the annular shoulder having a positive connecting portion with at least one connecting element, a guidance portion spaced from the positive connecting portion towards the end of the plug portion and then a centering portion adjacent the end of the plug portion, said centering portion having a smaller diameter than the guidance portion and being receivable in the centering area of the blind bore of the basic body with the guidance portion received in the guidance area of the blind bore and the positive connection portion being disposed in the positive connection area of the blind bore as the shoulder of the spacing sleeve engages the coronal end face, said means for preventing twisting comprising the connecting element of one of the sleeves and basic body being a groove and the connecting element of the other of the sleeve and basic body being a projection receivable in said groove when the plug portion of the sleeve is inserted in the blind bore with the annular shoulder engaging the coronal edge face.
2. A single tooth implant according to claim 1, wherein the centering area of the basic body is provided with internal threads.
3. A single tooth implant according to claim 1 or 2, wherein the blind bore includes a threaded portion between the centering area and the closed end of the basic body.
4. A single tooth implant according to claim 3, wherein the implant post completely traverses the spacing sleeve and can be threaded into the threaded position close to the closed end of the basic body.
5. A single tooth implant according to any one of claims 1 to 4, wherein each connecting element of the basic body has a shape of a coronal open positive connecting groove extending parallel to the longitudinal axis of the basic body .
6. A single tooth implant according to claim 5, wherein each positive connecting groove has a substantially circular segmental cross section in a plane extending perpendicular to the axis of the blind bore of the basic body .
7. A single tooth implant according to claim 5, wherein each positive connecting groove has a substantially triangular cross section in a plane extending perpendicular to the axis of the blind bore.
8. A single tooth implant according to claim 5, wherein each positive connecting groove has an approximately rectangular-curved cross section in a plane extending perpendicular to the axis of the line bore.
9. A single tooth implant according to any one of claims 5 to 8, wherein each positive connecting groove is open toward the closed end of the basic body.
10. A single tooth implant according to any one of claims 5 to 9, wherein each positive connecting groove has a decreasing cross section from the coronal end towards the closed end of the blind bore.
11. A single tooth implant according to claim 10, wherein the cross section of said positive connecting groove decreases radially from the coronal end of the closed end of the blind bore.
12. A single tooth implant according to any one of claims 1 to 11, wherein the basic body has a plurality of connecting elements, said connecting elements being spaced around the circumference of the blind bore of the basic body with an annular spacing of 30° therebetween.
13. A single tooth implant according to any one of claims 1 to 11, wherein the basic body has a plurality of connecting elements, said elements being spaced around a circumference of the blind bore with a 60° spacing therebetween.
14. A single tooth implant according to any one of claims 1 to 13, wherein the basic body has a plurality of connecting elements, normally spaced around a periphery of the blind bore and the spacing sleeve has a plurality of connecting elements spaced around the positive connecting portion with the number of elements of the spacing sleeve being less than the number of elements for the basic body.
15. A single tooth implant according to any one of claims 1 to 14, wherein the positive connection area of the basic body has an annular undercut between each connecting element and the guidance area.
16. A single tooth implant according to any one of claims 1 to 15, wherein an end wall of the basic body at the coronal end has a bevel tapering conically towards the closed end from the coronal front edge of the basic body into the positive connection area of the basic body.
17. A single tooth implant according to any one of claims 1 to 16, wherein the spacing sleeve has an annular undercut between the annular shoulder and each connecting element.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19534979.2 | 1995-09-20 | ||
| DE19534979A DE19534979C1 (en) | 1995-09-20 | 1995-09-20 | Endosseous single tooth implant with anti-rotation device |
| PCT/DE1996/001455 WO1997010769A1 (en) | 1995-09-20 | 1996-07-31 | Endosseus single-tooth implant with anti-rotation device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2232564A1 CA2232564A1 (en) | 1997-03-27 |
| CA2232564C true CA2232564C (en) | 2001-04-24 |
Family
ID=7772708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002232564A Expired - Fee Related CA2232564C (en) | 1995-09-20 | 1996-07-31 | Endosseus single-tooth implant with anti-rotation device |
Country Status (14)
| Country | Link |
|---|---|
| US (1) | US5823776A (en) |
| EP (1) | EP0851744B1 (en) |
| JP (1) | JP4065562B2 (en) |
| KR (2) | KR100435297B1 (en) |
| CN (1) | CN1104872C (en) |
| AT (1) | ATE186631T1 (en) |
| AU (1) | AU7082896A (en) |
| BR (1) | BR9610559A (en) |
| CA (1) | CA2232564C (en) |
| DE (2) | DE19534979C1 (en) |
| ES (1) | ES2140133T3 (en) |
| GR (1) | GR3032466T3 (en) |
| RU (1) | RU2155014C2 (en) |
| WO (1) | WO1997010769A1 (en) |
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-
1996
- 1996-07-31 WO PCT/DE1996/001455 patent/WO1997010769A1/en active IP Right Grant
- 1996-07-31 ES ES96931739T patent/ES2140133T3/en not_active Expired - Lifetime
- 1996-07-31 JP JP51229297A patent/JP4065562B2/en not_active Expired - Fee Related
- 1996-07-31 RU RU98107247/14A patent/RU2155014C2/en not_active IP Right Cessation
- 1996-07-31 CN CN96197092A patent/CN1104872C/en not_active Expired - Fee Related
- 1996-07-31 KR KR10-1998-0702004A patent/KR100435297B1/en active IP Right Grant
- 1996-07-31 AU AU70828/96A patent/AU7082896A/en not_active Abandoned
- 1996-07-31 DE DE59603683T patent/DE59603683D1/en not_active Expired - Lifetime
- 1996-07-31 CA CA002232564A patent/CA2232564C/en not_active Expired - Fee Related
- 1996-07-31 AT AT96931739T patent/ATE186631T1/en active
- 1996-07-31 BR BR9610559A patent/BR9610559A/en not_active IP Right Cessation
- 1996-07-31 EP EP96931739A patent/EP0851744B1/en not_active Expired - Lifetime
- 1996-08-22 US US08/701,688 patent/US5823776A/en not_active Expired - Lifetime
- 1996-09-10 KR KR1019970709271A patent/KR100269977B1/en not_active IP Right Cessation
-
2000
- 2000-01-25 GR GR20000400160T patent/GR3032466T3/en unknown
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| GR3032466T3 (en) | 2000-05-31 |
| EP0851744A1 (en) | 1998-07-08 |
| CA2232564A1 (en) | 1997-03-27 |
| KR100435297B1 (en) | 2004-09-08 |
| KR19990045760A (en) | 1999-06-25 |
| RU2155014C2 (en) | 2000-08-27 |
| CN1104872C (en) | 2003-04-09 |
| EP0851744B1 (en) | 1999-11-17 |
| DE59603683D1 (en) | 1999-12-23 |
| AU7082896A (en) | 1997-04-09 |
| ES2140133T3 (en) | 2000-02-16 |
| ATE186631T1 (en) | 1999-12-15 |
| BR9610559A (en) | 1999-07-06 |
| JP4065562B2 (en) | 2008-03-26 |
| US5823776A (en) | 1998-10-20 |
| DE19534979C1 (en) | 1997-01-09 |
| KR19990022802A (en) | 1999-03-25 |
| WO1997010769A1 (en) | 1997-03-27 |
| JPH11512324A (en) | 1999-10-26 |
| CN1196670A (en) | 1998-10-21 |
| KR100269977B1 (en) | 2000-11-01 |
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| MKLA | Lapsed |
Effective date: 20160801 |