WO2002043606A2 - Method of finishing resin-based dental restorations - Google Patents
Method of finishing resin-based dental restorations Download PDFInfo
- Publication number
- WO2002043606A2 WO2002043606A2 PCT/US2001/044719 US0144719W WO0243606A2 WO 2002043606 A2 WO2002043606 A2 WO 2002043606A2 US 0144719 W US0144719 W US 0144719W WO 0243606 A2 WO0243606 A2 WO 0243606A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bur
- restoration
- resin
- burs
- low speed
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/0003—Making bridge-work, inlays, implants or the like
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/12—Tools for fastening artificial teeth; Holders, clamps, or stands for artificial teeth
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C3/00—Dental tools or instruments
- A61C3/02—Tooth drilling or cutting instruments; Instruments acting like a sandblast machine
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C5/00—Filling or capping teeth
- A61C5/50—Implements for filling root canals; Methods or instruments for medication of tooth nerve channels
Definitions
- the present invention relates to a method for finishing resin-based dental restorations for human teeth and, in particular, to a method for contouring and polishing resin-based dental restorations.
- the preparation of dental restorations for human teeth using resin-based materials is well known in the art.
- the process of finishing such restorations - i.e., contouring and polishing the restorations to create a natural appearance - can be a time-consuming multi-step process, requiring the use of several different tools.
- the resin-based restoration is first subject to initial contouring, using a diamond or tungsten carbide bur to roughly reproduce the occlusal anatomy of the tooth.
- the restoration is then fine contoured, using a tungsten carbide finishing bur to blend the restoration into the tooth and to characterize the restoration by creating developmental grooves, lobes, ridges and other secondary and tertiary anatomy.
- a tungsten carbide finishing bur to blend the restoration into the tooth and to characterize the restoration by creating developmental grooves, lobes, ridges and other secondary and tertiary anatomy.
- the restoration is then smoothed using rubber finishing instruments, such as rubber discs, cups and points.
- the restoration is polished to create an enamel-like finish, using diamond or aluminum oxide polishing pastes applied by rubber cups and points.
- Fine contouring and smoothing are the most important steps in the process of finishing a resin-based restoration. Creating a smooth and accurately defined transition or margin between the resin and the tooth extends the life of the restoration by reducing general wear and minimizing the risk of microleakage, chipping, staining and other wear problems that may cause deterioration of the restoration and increase the risk of recurrent caries.
- the step of fine contouring a resin-based restoration is performed using tungsten carbide burs in connection with high-speed, low-torque handpieces.
- the operation of the bur at high speeds is thought to permit rapid removal of material, thereby reducing the treatment time and minimizing the generation of frictional heat.
- the use of high-speed burs requires a high level of skill and attention.
- High-speed tungsten carbide burs rapidly and aggressively remove resin and enamel, thereby increasing the risk of accidental damage to the restoration and/or enamel of the tooth. .
- the operation of the bur at low torque limits the amount of pressure that can be applied to the bur.
- the inadvertent application of excessive pressure can cause the bur to unexpectedly seize up and stop rotating.
- the operator may lose control of the bur, allowing the bur to slip and gouge or chatter across the surface of the restoration and tooth, causing damage to the restoration and enamel of the tooth.
- high-speed burs must be operated under a constant spray of water to avoid generating frictional heat, which may cause damage to the restoration and tooth. This spray of water also creates a mist which can obscure the working area.
- the step of fine contouring the restoration using high-speed, low-torque burs must be performed by removing the material in small steps, using light contact pressure to minimize the risk of inadvertently damaging the restoration or enamel of the tooth.
- the process of finishing restorations can be time consuming and tedious, requiring a high degree of skill and patience.
- a method of finishing resin-based dental restorations is described, using burs operated at low-speed, high-torque, which provides distinct advantages when compared to the prior art methods using high-speed, low-torque burs.
- the method of the present invention comprises contouring and polishing resin-based restorations using burs operated at low-speed and high-torque, without the subsequent smoothing and polishing steps of prior art methods.
- Initial contouring of the restoration to reproduce the rough occlusal anatomy of the tooth is accomplished using a bur in connection with a low-speed, high-torque handpiece.
- low-speed means operation at less than approximately
- high-torque means sufficient torque to maintain a constant speed between approximately 12,000 rpm to 30,000 rpm, when firm, continuous pressure is applied to the bur as the restoration is being contoured.
- Burs used for contouring resin-based restorations are commercially available having from 8 to 30 flutes - the burs having a higher number of flutes providing a smoother finish and being more useful for fine contouring. Such burs are provided in a variety of shapes, each shape designed to perform a particular task in reproducing the various anatomical features of the restoration.
- the step of initial contouring using a bur having from 8 to 16 flutes, to rapidly create the rough occlusal anatomy of the restoration.
- the selection of the bur shape or shapes used in contouring the restoration is a function of the shape of the anatomy which must be reproduced and the preference of the individual operator.
- the restoration is then fine contoured to blend the restoration into the tooth and to characterize the restoration by reproducing secondary and tertiary anatomy, such as developmental grooves, lobes, ridges and other anatomy.
- the fine contouring step is performed using a low-speed, high-torque bur having at least approximately 20 flutes and, preferably, 30 flutes.
- Firm, continuous pressure is applied to the bur in forming the anatomy of the restoration and in defining the margin between the restoration and tooth.
- contouring resin-based restorations using low-speed, high-torque burs and applying firm, continuous pressure to the bur produces a burnishing effect on the resin material.
- the resulting contoured restoration has a smooth, enamel-like finish, such that the subsequent steps of smoothing and polishing the surface of the restoration are generally not required.
- the operator is able to accomplish the steps of contouring, smoothing and polishing in a single step, thereby dramatically reducing treatment time and the need to use multiple instruments, such as rubber smoothing and polishing instruments.
- the prior art method of contouring restorations using high-speed burs results in a cutting effect on the resin material, which produces fine ridges on the surface of the contoured restoration. This uneven surface is aesthetically unacceptable and, more importantly, makes the restoration less wear resistant and more susceptible to staining.
- the prior art methods of finishing restorations require the additional steps of smoothing and polishing the surface of the contoured restoration.
- the method of the present invention using low-speed, high-torque burs further provides the operator with greater control over the bur in comparison to prior art methods. Because the bur operates at low speed, it removes material at a slower rate than prior art high-speed burs. As a result, the operator has more time to manipulate the bur and form fine anatomy. Moreover, because the burs of the present invention are operated at high-torque, the operator may exert firm pressure on the bur without the risk that the bur may seize up and cause the operator to lose control over the bur. Thus, the inventive method of operating burs at low-speed and high-torque allows the operator to contour the restoration using firm, continuous movements of the bur. This increased level of control over the bur is critical in forming smooth and accurately defined margins between the restoration and the enamel of the tooth.
- the prior art high-speed, low-torque burs remove material rapidly and aggressively, with a corresponding increase in the risk of inadvertent damage to the restoration and to the enamel of the tooth.
- the operation of the bur at low torque creates a further risk that the inadvertent application of excessive pressure on the bur may cause the bur to seize up and stop rotating. As a result, the operator may lose control over the bur, permitting the bur to slip and cause damage to the restoration and enamel of the tooth.
- prior art high-speed, low-torque burs must be used with light contact pressure to remove material in small steps, allowing the operator little time to manipulate the bur to form detailed anatomy and smooth, accurately defined margins.
- the prior art methods do not provide the operator with sufficient control over the bur to permit the firm, continuous movement of the bur required to produce smooth and accurately defined margins between the restoration and the enamel of the tooth.
- the inability to produce accurately defined margins cannot be corrected by subsequent smoothing and polishing using rubber instruments, which are incapable of contouring the restoration.
- the method of the present invention typically results in restorations with a superior finish in comparison to prior art methods.
- the present method of using low-speed burs minimizes the generation of frictional heat, which may cause damage to the restoration and to the enamel of the tooth.
- the low-speed burs may be used without spraying the working surface of the restoration with water or air to prevent the buildup of heat, as is required by prior art methods using high-speed burs.
- This spray of water creates a mist which can obscure the working area, thereby increasing the risk of accidental damage to the restoration and to the enamel of the tooth.
- the use of prior art high-speed burs forces the operator to frequently pause during the contouring of the restoration to permit the progress of the work to be checked.
- the present method provides the operator with increased control over the bur, permitting the bur to be used more surely with firm, continuous pressure and little risk of accidental damage to the restoration and the enamel of the tooth.
- the prior art high-speed, low-torque burs remove material at a much more rapid rate, the corresponding loss of control over the bur and increased risk of accidental damage to the restoration and to the enamel of the tooth require the operator to exercise a much higher level of skill and attention during the contouring steps of finishing the restoration.
- tungsten vanadium steel burs commercially available from Busch & Co., Germany
- the relative softness of steel burs is believed to produce a superior burnishing effect in comparison to tungsten carbide burs having the same size and shape. This burnishing effect significantly enhances the ability of low-speed, high-torque burs to polish resin-based restorations.
- burs having a higher number of flutes produce a smoother and more polished finish.
- tungsten carbide burs may be used to fine contour the restoration, which have a modified profile to increase the ability of the bur to burnish rather than cut resin-based restorations.
- burs are typically designed having flutes that are angled toward the direction of rotation to increase the cutting action of the bur. It is believed that changing the profile of the bur, such that the flutes are normal to the axis of the bur or angled away from the direction of rotation, increases the ability of the bur to burnish rather than cut resin- based restorations.
- the use of tungsten carbide provides increased wear resistance and corrosion resistance in comparison to steel.
- tungsten carbide burs are more wear resistant and may be repeatedly sterilized by autoclaving, in comparison to steel burs which typically must be discarded after one or two procedures and can be corroded by autoclaving.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002436877A CA2436877A1 (en) | 2000-12-01 | 2001-11-29 | Method of finishing resin-based dental restorations |
EP01998275A EP1349512A4 (en) | 2000-12-01 | 2001-11-29 | Method of finishing resin-based dental restorations |
AU2002219927A AU2002219927A1 (en) | 2000-12-01 | 2001-11-29 | Method of finishing resin-based dental restorations |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US25056000P | 2000-12-01 | 2000-12-01 | |
US60/250,560 | 2000-12-01 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002043606A2 true WO2002043606A2 (en) | 2002-06-06 |
WO2002043606A3 WO2002043606A3 (en) | 2003-01-30 |
Family
ID=22948247
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2001/044719 WO2002043606A2 (en) | 2000-12-01 | 2001-11-29 | Method of finishing resin-based dental restorations |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1349512A4 (en) |
AU (1) | AU2002219927A1 (en) |
CA (1) | CA2436877A1 (en) |
WO (1) | WO2002043606A2 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3872594A (en) * | 1974-01-21 | 1975-03-25 | Jerome M Gerteisen | Rotary burnishers |
US3872593A (en) * | 1965-10-20 | 1975-03-25 | Dentsply Research Dev Corp | Dental console |
US4775320A (en) * | 1986-09-02 | 1988-10-04 | Howard B. Marshall | Method and apparatus for making a dental prosthesis and product therefrom |
US4906185A (en) * | 1980-04-07 | 1990-03-06 | Minnesota Mining And Manufacturing Company | Orthodontic bracket adhesive and abrasive for removal thereof |
US5927976A (en) * | 1996-05-10 | 1999-07-27 | Cyberdent, Inc. | Medication injection device and method |
-
2001
- 2001-11-29 WO PCT/US2001/044719 patent/WO2002043606A2/en not_active Application Discontinuation
- 2001-11-29 EP EP01998275A patent/EP1349512A4/en not_active Withdrawn
- 2001-11-29 CA CA002436877A patent/CA2436877A1/en not_active Abandoned
- 2001-11-29 AU AU2002219927A patent/AU2002219927A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3872593A (en) * | 1965-10-20 | 1975-03-25 | Dentsply Research Dev Corp | Dental console |
US3872594A (en) * | 1974-01-21 | 1975-03-25 | Jerome M Gerteisen | Rotary burnishers |
US4906185A (en) * | 1980-04-07 | 1990-03-06 | Minnesota Mining And Manufacturing Company | Orthodontic bracket adhesive and abrasive for removal thereof |
US4775320A (en) * | 1986-09-02 | 1988-10-04 | Howard B. Marshall | Method and apparatus for making a dental prosthesis and product therefrom |
US5927976A (en) * | 1996-05-10 | 1999-07-27 | Cyberdent, Inc. | Medication injection device and method |
Non-Patent Citations (1)
Title |
---|
See also references of EP1349512A2 * |
Also Published As
Publication number | Publication date |
---|---|
AU2002219927A1 (en) | 2002-06-11 |
EP1349512A2 (en) | 2003-10-08 |
WO2002043606A3 (en) | 2003-01-30 |
EP1349512A4 (en) | 2006-02-22 |
CA2436877A1 (en) | 2002-06-06 |
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