Optical measurement of teeth
AssigneeKaltenbach & Voight GmbH & Co.
InventorsRobert Massen, Joachim Gassler, Christian Konz, Harald Richter
Life of this patent
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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.
Claims12
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.
A method for determining correction values for error correction of optically measured coordinate values of the surface of a tooth, wherein:
- 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 that
- the 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.
Dependencies are inferred from the claim text.