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US 4,964,770 AGranted
Process of making artificial teeth
OwnerHans Steinbichler, Jurgen Willerinventors
Life of this patent
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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.
Claims12
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.times.(1+m.times.cos .theta.) (1)
- wherein:
- I=intensity
- a=background brigthness
- m=contrast
- .theta.=angle,
- and
- forming an artificial tooth having the required shape as determined by said data.
8 more elements
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.times.(1+m.times.cos .theta.) (1)
- I.sub.2 =a.times.(1+m.times.cos (.theta.+.theta..sub.2)), and (2)
- I.sub.3 =a.times.(1+m.times.cos (.theta.+.theta..sub.3)), (3)
- wherein
- I, I.sub.2, I.sub.3 =intensity,
- a =background brightness
- m =contrast
- .theta., .theta..sub.2, .theta..sub.3 =angle,
- and
- forming an artificial tooth having the required shape as determined by said data.
10 more elements
Dependencies are inferred from the claim text.