A Local Deformation Method of Denture Surface Based on Topological Reconstruction

Abstract

The invention discloses a local deformation method of a denture surface based on topology reconstruction, comprising the following steps: A. calculating the influence area of ​​a drag point according to denture model data; B. deleting the drag point in the influence area of ​​the drag point The topological information of all points other than the hole is formed to form a hole, and the information of all points on the hole boundary is stored; C. According to the drag point and the above hole boundary point information, the hole is repaired through the deformation operation. The method of the present invention uses the projection distance as the topological distance on the denture model, which is closer to the projection distance of the real topological distance, and uses the interpolation method to reconstruct the topology as the result of local deformation, completely avoiding the self-intersection of the triangular mesh of the denture model question. As a local deformation method of the denture surface based on topology reconstruction, the invention can be widely used in the field of denture restoration.

Description

technical field [0001] The invention relates to the field of denture restoration, in particular to a method for local deformation of denture surfaces based on topology reconstruction. Background technique [0002] Definition of terms: [0003] 1. Drag point: the basis of local deformation. The tooth preparation model determines the local deformation trend of the tooth preparation model according to the starting and ending positions of the drag point. [0004] 2. Influenced area: when the drag point is moved, the deformed area of ​​the tooth preparation model is called the affected area of ​​the drag point. [0005] 3. Projection distance: connect two points on the tooth preparation model to get a line segment, the projection of the line segment on the original model is called the projection line segment, and the distance of the projection line segment is called the projection distance. [0006] 4. Interpolation points: points generated under given constraints. [0007] 5....

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Problems solved by technology

[0010] 1. The local deformation method based on the subdivision deformation space. This method first constructs the subdivision deformation space of the restoration model, and maps the data into the space, and then indirectly changes the local shape of the restoration by changing the subdivision deformation space; This method is to change the tooth preparation by changing the subdivision space, but the definition of the subdivision space is not intuitive, and the deformation range is difficult to determine

[0011] 2. B-spline curve interpolation restoration model, this method interpolates the restoration model through the B-spline curve, and then realizes local deformation by changing the control points of the B-spline curve; since this method interpolates the restoration model through the B-spline curve, Then by changing the control points of the B-spline curve to achieve local deformation, the amount of calculation is large, and it is not suitable for systems with high real-time requirements.

[0012] 3. Curve-driven local deformation algorithm. This method fits the characteristic line, establishes the mapping relationship between the fitted curve and the vertex, and achieves local deformation by modifying the characteristic curve. The efficiency of the method is improved, but the improvement in efficiency is not enough to meet the requirements of good interactivity, and the calculation deviation of the topological distance of the deformation point at the concave and convex places is relatively large, and there may also be self-intersection problems

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