Patent US4878842A successfully refreshed from Google Patents.
US4878842A
Expired / Lapsed
US
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Apparatus and method for preparing teeth for crown or bridge work or other dental work
Assignee: Individual
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Filing: 1987-11-02
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Granted: 1989-11-07
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Expires: 2007-11-02
Abstract
Abstract Selection of a proper drill bit for preparing a tooth to receive a crown or a bridge is accomplished through the use of a kit which includes a measuring guide and a template showing the profiles of various drill bits. The measuring guide and template are adapted to cooperate with the conventional X-ray. The X-ray is placed behind the measuring guide and oriented with the axis of the tooth perpendicular to a scale which is printed on the measuring guide. The measuring guide is otherwise transparent. By holding the X-ray and measuring guide up to light, a safe margin around the pulp chamber can be identified by the lines of the scale. Next, the drill template is placed in the measuring guide and manipulated until a drill bit profile is located which will maintain the safe margin around the pulp chamber and yet not cut into adjacent teeth. The method is taught together with a kit for practicing the method. The kit includes a selection of drill bits, the drill bit template, and measuring guide.
Inventors
- 👤 Louis J. Malcmacher
- 👤 Jeffrey S. Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:03
CPC Classifications
A; A61; A61C; A61C19/00; A61C19/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
126 words
A dental drilling kit comprising a plurality of drill bits of different profiles and measuring means for determining the proper one of the bits for use in preparing a tooth, said measuring means comprising a first transparent sheet having a reference scale printed on it and a second reference sheet having a profile of each of the drill bits printed on it, said first sheet formed of a transparent plastic material folded to define a front panel and a rear panel, said front panel and said rear panel being adapted to receive said second reference sheet therebetween, said front and rear panels including congruent arcuate cut-outs in opposite lateral edges to facilitate manipulation of said second reference sheet between said front panel and said rear panel.
Claim 2
Dependent Claim
126 words
A dental drilling kit comprising a plurality of drill bits of different profiles and measuring means for determining the proper one of the bits for use in preparing a tooth, said measuring means comprising a first transparent sheet having a reference scale printed on it and a second reference sheet having a profile of each of the drill bits printed on it, said first sheet formed of a transparent plastic material folded to define a front panel and a rear panel, said front panel and said rear panel being adapted to receive said second reference sheet therebetween, said front and rear panels including congruent arcuate cut-outs in opposite lateral edges to facilitate manipulation of said second reference sheet between said front panel and said rear panel.
Claim 3
Independent Claim
110 words
A method of selecting a drill bit for reducing a patient's tooth said method comprising the steps of providing an X-ray of the tooth to be prepared and surrounding teeth, if any, the X-ray showing the outline of the pulp chamber of the tooth to be prepared, superimposing a reference scale on the X-ray, using the reference scale to identify a safe margin around the pulp chamber of the tooth to be prepared, and superimposing a drill bit profile on the X-ray and scale, the drill bit profile demonstrating that a drill bit having the profile will provide adequate clearance for the pulp chamber and will not contact adjacent teeth.
Claim 4
Independent Claim
110 words
A method of selecting a drill bit for reducing a patient's tooth said method comprising the steps of providing an X-ray of the tooth to be prepared and surrounding teeth, if any, the X-ray showing the outline of the pulp chamber of the tooth to be prepared, superimposing a reference scale on the X-ray, using the reference scale to identify a safe margin around the pulp chamber of the tooth to be prepared, and superimposing a drill bit profile on the X-ray and scale, the drill bit profile demonstrating that a drill bit having the profile will provide adequate clearance for the pulp chamber and will not contact adjacent teeth.
Claim 5
Dependent Claim
53 words
The method of claim 2 wherein the step of superimposing a drill bit profile includes the step of superimposing a sheet with a plurality of drill bit profiles and manipulating the sheet to selectively position one of the drill bit profiles over the portion of the selected tooth which is to be reduced.
Claim 6
Dependent Claim
36 words
The method of claim 2 wherein the step of superimposing a reference scale includes the step of positioning a reference scale with its mid-line approximately centered on the pulp chamber of the tooth to be reduced.
Claim 7
Dependent Claim
50 words
The method of claim 2 wherein the step of superimposing a sheet with a plurality of drill bit profiles includes the step of inserting the sheet with a plurality of drill bit profiles between the front and rear panels of a transparent sheet on which the reference scale is printed.
Claim 8
Dependent Claim
46 words
The method of claim 5 wherein the step of superimposing a reference scale on the X-ray includes the step of placing the X-ray behind the rear panel of a transparent sheet having front and rear panels, the reference scale being printed on the front panel thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-06 | 1993-05-08 | 1993-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-06 | 1997-05-08 | 1997-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-06 | 2001-05-08 | 2001-11-07 | $7700.00 | Window Closed / Lapsed |