Computer-implemented method for digitally designing a dental restoration and a computer-readable medium

摘要

Computer-implemented method for digitally designing a dental restoration for a rest tooth, wherein the rest tooth is described by data of the rest tooth and wherein a tooth template is described by data of the tooth template, by means of an Laplacian surface deformation to deform the tooth template towards the surface of the rest tooth, wherein the method uses, for the Laplacian surface deformation, an angle weighting function depending on: the angle between the normal direction of a target on the surface of the rest tooth or the normal direction of a handle on the tooth template; and the direction of a line connecting the target and the handle; wherein the angle weighting function is used to weight the handle for deforming the tooth template towards the rest tooth. Further, the invention is related to a computer-readable medium having stored thereon instructions, which when executed by a processor, are adapted to perform the method steps of the inventive computer-implemented method.

主权项

1. Computer-implemented method for digitally designing a dental restoration for a rest tooth using a tooth template, wherein the rest tooth is described by scanned data of the rest tooth or a dental model of the rest tooth, and the tooth template is described by data of the tooth template, and wherein a normal direction to a surface at a point is the same as a normal direction to a tangent plane to the surface at the point, the method comprising the steps of:
generating, via a processor, for display on a computer display, data sets for the rest tooth and tooth template depicted as objects; automatically deforming, via the processor, the tooth template towards the surface of the rest tooth by Laplacian surface deformation using an angle weighting function depending on: the angle between the normal direction of a target on the surface of the rest tooth or the normal direction of a handle on the tooth template; and the direction of a line connecting the target and the handle; wherein the angle weighting function is used to weight the handle for deforming the tooth template towards the rest tooth; and defining the data of the tooth templates as a first polygonal mesh describing a surface of the tooth template and defining the data of the rest tooth as a second polygonal mesh describing the surface of the rest tooth, wherein the handle lies inside, on an edge or on a vertex of a polygon of the first polygonal mesh, and wherein the target lies inside, on an edge or on a vertex of a polygon of the second polygonal mesh.