Tooth and gingiva modeling method suitable for digital orthodontic application

Abstract

The invention relates to the technical field of digital orthodontics, in particular to a tooth and gingiva modeling method suitable for digital orthodontics application. The method comprises the following steps of: A, establishing a tooth local coordinate system by using a segmented dental crown curved surface; B, determining a tooth root section profile through a coordinate system tooth root coordinate axis; C, performing two-dimensional triangulation on the bottom surface of a tooth root, and adding position constraints and tangential constraints to perform convex shape control; D, generating tooth side grids by adopting a clustering method based on plane approximation and two-dimensional triangularization; E, optimizing side grids by adopting a Hermite curved surface interpolation algorithm; and F, performing shape fusion on the dental crown, the bottom surface and the side surfaces to enable the teeth to form a closed and complete triangular mesh model. The three-dimensional model can be obtained only through a scanner, teeth and gingiva are accurately reconstructed, a complete and closed triangular network model is formed, and the three-dimensional model 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 and gum modeling method suitable for digital orthodontic applications. 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 li...

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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 o...

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