A tooth modeling method with gingiva for digital orthodontics

Abstract

The present invention relates to the technical field of digital orthodontics, in particular to a tooth modeling method suitable for digital orthodontics with gingiva, which adopts the following steps: A. Using the segmented crown surface to establish a tooth local coordinate system; B. Through the root coordinate axis of the coordinate system, determine the cross-sectional profile of the tooth root; C. Carry out two-dimensional triangulation on the bottom surface of the tooth root, and add position constraints and tangential constraints to control the convex shape; D. Use the clustering method based on plane approximation and two Three-dimensional triangulation to generate the tooth side mesh; E. Use the Hermite surface interpolation algorithm to optimize the side mesh; F. Fusion the shape of the crown, bottom surface, and side surface to make the tooth a closed and complete triangular mesh model; it can only rely on The 3D model obtained by the scanner accurately reconstructs the teeth and gums to form a complete closed triangular network model, which can be used for orthodontic digital applications such as tooth arrangement design, orthodontic animation demonstration and 3D printing.

Description

technical field [0001] The invention relates to the technical field of digital orthodontics, in particular to a tooth modeling method with gingiva which is suitable for digital orthodontics. Background technique [0002] In the field of oral digitalization, digital tooth and gum models are the core data of computer-aided orthodontic systems, and are widely used in orthodontic digital processes such as doctor-patient communication, invisible orthodontics, bracket positioning, and artificial intelligence smile design. In order to be able to Orthodontic digital applications such as tooth arrangement design, orthodontic animation demonstration, and 3D printing require the construction of complete and separated surface models of teeth and gums. [0003] Structured light and CT (tomography) technology can measure the three-dimensional shape of teeth and gums. However, in order to reduce the cost and complexity, in the actual digital application of orthodontics, the CT measurement ...

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Problems solved by technology

For example, in "Filling holes in meshes" by Liepa P., in the effect of filling holes on the crown surface, the hole filling method can neither control the extension direction and length of the root surface, nor the shape of the tooth side, which cannot meet the requirements of orthodontics. In the application, the position and posture of the tooth root and the requirements for preventing the collision and interference of the side surfaces of adjacent teeth are required

[0007] Given the tooth model, Dai N, Yu X et al. proposed in "Gingival morphology‐controlled design of the complete denture baseplate[J]" that the gingival margin line and shape function are used to construct the gingival surface. This method is oriented to the application of removable complete dentures , does not construct the gum base required for orthodontic applications and does not support gum deformation animation

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