Patent ID: 7810249
Filing Date: 2010-10-12
Classification: A61C,G06T,G16H

Abstract:
1. A non-transitory computer readable medium having a program stored therein that when executed by a processor makes cutting data for inner face of a dental prosthesis, and performs steps comprising: creating with a surface model creating means a surface model of a portion, at which a dental prosthesis is mounted, based on three-dimensional data obtained by a three-dimensional measuring device to measure the three-dimensional coordinates (x, y, z) of the shape of a gypsum model including an abutment tooth; specifying with a cutting direction specifying means a direction of a center shaft of a cutting bar of an automatic cutting machine for cutting a dental prosthesis to be produced, the direction being specified with respect to the surface model; and creating with a surface model for machining creating means a surface model for machining by the steps of: adjusting a basic axis (z axis) of the three-dimensional data of the surface model created by the surface model creating means so as to be in parallel with the center shaft of the cutting bar; changing the three-dimensional data of the surface model to three-dimensional data having new coordinates by determining plane moving coordinates (X axis and Y axis) of the cutting bar of an automatic cutting machine for cutting a dental prosthesis in a view in which the surface model is seen from the occlusion face side in parallel with the center shaft of the cutting bar, and determining a base axis (Z axis) in the surface model; and converting the plane moving coordinates of a point which is on the straight line being rectangular to the base axis and crossing the base axis on a cross sectional plane of the changed new three-dimensional data, to be equal to the plane moving coordinates of a point having the highest height from a specified face being rectangular to the base axis at the opposite side of the occlusion face of the surface model, the distance from the base axis to the point on the straight line being shorter than the distance from the base axis to the point having a high height from the specified face.