TOOTH TYPE JUDGMENT PROGRAM CROWN POSITION JUDGMENT DEVICE AND METHOD OF THE SAME

摘要

There is provided a crown position estimating program capable of estimating a tooth position of a tooth corresponding to a crown without specifying a point on the surface of the crown. In the crown position determination program, a three-dimensional normal line attachment point group representing the surface of the three-dimensional shape data is extracted from the input three-dimensional shape data, and one of the extracted three- The local coordinate system is calculated based on the variance of the normal line of the point group included in the extracted analysis target area and the local coordinate system of the unit normal vector corresponding to each point of the point group included in the region to be analyzed The distribution of directions in the local coordinate system of the unit normal vector corresponding to each point of the point group is stored in association with the kind of tooth and the kind of teeth corresponding to the obtained distribution As the kind of teeth in the region to be analyzed.