Optical measurement of teeth
First Claim
1. A method of optical measurement of teeth, comprising a first step of optically measuring a surface of a tooth to determine measured coordinate values of a plurality of measured points on said tooth surface, and a second step of performing error correction upon at least some of said measured co-ordinate values to determine corrected co-ordinate values of said tooth surface wherein a correction value used for the error correction in said second step is determined using a value which depends upon the position of the point to be corrected and the position of a projection system used in said first step.
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Accused Products
Abstract
3D tooth measurement by means of an optical probe wherein a prior matting treatment of the tooth to be measured can be dispensed with. The consequential reflection-dependent measuring errors are compensated by an error correction method.
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Citations
12 Claims
- 1. A method of optical measurement of teeth, comprising a first step of optically measuring a surface of a tooth to determine measured coordinate values of a plurality of measured points on said tooth surface, and a second step of performing error correction upon at least some of said measured co-ordinate values to determine corrected co-ordinate values of said tooth surface wherein a correction value used for the error correction in said second step is determined using a value which depends upon the position of the point to be corrected and the position of a projection system used in said first step.
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7. A method for determining correction values for error correction of optically measured coordinate values of the surface of a tooth, wherein:
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the exact coordinate values of any desired point on the tooth surface are determined and stored as reference coordinate values; the desired point is furthermore measured optically from different projection/pick-up positions of a measuring apparatus in such a way as to be subject to measuring errors caused by reflection; and
in thatthe differences between the reference coordinate values and the measured coordinate values are calculated for each projection/pick-up position and stored as said correction values together with a corresponding projection/pick-up position value. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification