US4964770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making artificial teeth
Assignee: Individual
•
Filing: 1988-07-12
•
Granted: 1990-10-23
•
Expires: 2008-07-12
Abstract
Abstract In a process of making artificial teeth horizontal or other contour lines are generated on the ground tooth stump and on adjacent surfaces, said lines are detected by optoelectronic means, the data which have thus been acquired are used to compute the three-dimensional shapes of the tooth stump and of the required artificial tooth, and an artificial tooth having the shape which has thus been determined is then made by processes known per se.
Inventors
- 👤 Hans Steinbichler
- 👤 Jurgen Willer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:26
CPC Classifications
A; A61; A61C; A61C5/00; A61C5/70; A61C5/77; A61C13/00; A61C13/0003; A61C13/0004; A61C9/00; A61C9/004; A61C9/0046; A61C9/0053; A61C9/006; G; G01; G01B; G01B11/00; G01B11/24; G01B11/25; G01B11/254; G16; G16H; G16H20/00; G16H20/40
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
74 words
A process of making artificial teeth comprising, generating horizontal or other contour lines on a ground tooth and on adjacent surfaces, acquiring data derived from said lines by optoelectronic means, computing the three-dimensional shapes of the tooth and of the required artificial tooth from said data in accordance with the formula I=a×(1+m×cos θ) (1) wherein: I=intensity a=background brigthness m=contrast θ=angle, and forming an artificial tooth having the required shape as determined by said data.
Claim 2
Dependent Claim
74 words
A process of making artificial teeth comprising, generating horizontal or other contour lines on a ground tooth and on adjacent surfaces, acquiring data derived from said lines by optoelectronic means, computing the three-dimensional shapes of the tooth and of the required artificial tooth from said data in accordance with the formula I=a×(1+m×cos θ) (1) wherein: I=intensity a=background brigthness m=contrast θ=angle, and forming an artificial tooth having the required shape as determined by said data.
Claim 3
Dependent Claim
21 words
A process according to claim 1, characterized in that the horizontal or other contour lines are generated by a projection process.
Claim 4
Dependent Claim
23 words
A process according to claim 1, characterized in that the horizontal or other contour lines are recorded with utilization of the moire effect.
Claim 5
Dependent Claim
20 words
A process according to claim 1, characterized in that the horizontal or other contour lines are generated by shadow projection.
Claim 6
Dependent Claim
24 words
A process according to claim 1, characterized in that the horizontal or other contour lines are generated by interferometry by means of a laser.
Claim 7
Dependent Claim
19 words
A process according to claim 1, characterized in that the lines are recorded by means of a video camera.
Claim 8
Dependent Claim
97 words
A process of making artificial teeth comprising, generating horizontal or other contour lines on a ground tooth and on adjacent surfaces, acquiring data derived from said lines by optoelectronic means, computing the three-dimensional shapes of the tooth and of the required artificial tooth form said data, in accordance with the formula I=a×(1+m×cos θ) (1) I.sub.2 =a×(1+m×cos (θ+θ.sub.2)), and (2) I.sub.3 =a×(1+m×cos (θ+θ.sub.3)), (3) wherein I, I 2 , I 3 =intensity, a =background brightness m =contrast θ, θ 2 , θ 3 =angle, and forming an artificial tooth having the required shape as determined by said data.
Claim 9
Dependent Claim
97 words
A process of making artificial teeth comprising, generating horizontal or other contour lines on a ground tooth and on adjacent surfaces, acquiring data derived from said lines by optoelectronic means, computing the three-dimensional shapes of the tooth and of the required artificial tooth form said data, in accordance with the formula I=a×(1+m×cos θ) (1) I.sub.2 =a×(1+m×cos (θ+θ.sub.2)), and (2) I.sub.3 =a×(1+m×cos (θ+θ.sub.3)), (3) wherein I, I 2 , I 3 =intensity, a =background brightness m =contrast θ, θ 2 , θ 3 =angle, and forming an artificial tooth having the required shape as determined by said data.
Claim 10
Dependent Claim
21 words
A process according to claim 7, characterized in that the horizontal or other contour lines are generated by a projection process.
Claim 11
Dependent Claim
23 words
A process according to claim 7, characterized in that the horizontal or other contour lines are recorded with utilization of the moire effect.
Claim 12
Dependent Claim
20 words
A process according to claim 7, characterized in that the horizontal or other contour lines are generated be shadow projection.
Claim 13
Dependent Claim
24 words
A process according to claim 7, characterized in that the horizontal or other contour lines are generated by interferometry by means of a laser.
Claim 14
Dependent Claim
19 words
A process according to claim 7, characterized in that the lines are recorded by means of a video camera.
References Cited (Backward Citations)
US3861044A
Cited
US4182312A
Cited
EP0040165A1
Cited
EP0054785B1
Cited
US4575805A
Cited
EP0091876A1
Cited
US4611288A
Cited
EP0110797A1
Cited
US4663720A
Cited
US4821200A
Cited
US4837732A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-22 | 1994-04-23 | 1994-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-22 | 1998-04-23 | 1998-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-22 | 2002-04-23 | 2002-10-23 | $7700.00 | Window Closed / Lapsed |