Establishment method of coordinate system based on target dental arch curve, automatic tooth arrangement method and tooth movement evaluation method

Abstract

The invention relates to an establishment method of a coordinate system based on a target dental arch curve, and an automatic tooth arrangement method and a tooth movement evaluation method established based on the coordinate system of the dental arch curve. The dental arch curve coordinate system has different local coordinate systems consisting of a tangent axis, a main normal axis and a secondary normal axis at different points of a curve, and adapts to three-dimensional positions of teeth, so that more efficient and accurate automatic tooth arrangement can be guided, and clinical tooth movement evaluation can be better met; more scientific, more reasonable and more accurate tooth movement scheme design and curative effect evaluation are facilitated.

Description

technical field [0001] The invention belongs to the technical field of dental orthodontics, and in particular relates to a method for establishing a coordinate system based on a target dental arch curve, an automatic tooth arrangement method and a tooth movement evaluation method based on the dental arch curve coordinate system. [0002] technical background [0003] Nowadays, orthodontic treatment has entered the digital era. Whether it is digital fixed orthodontics or digital invisible orthodontic technology without brackets, it is necessary to digitally arrange teeth based on the digital dental model before treatment, arrange the target dental model, and carry out the process from the initial Evaluation of tooth movement to target position. The establishment of efficient and accurate automatic tooth arrangement and scientific and accurate tooth movement evaluation method is of great significance for the design of treatment goals, the construction of treatment mechanics sys...

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Problems solved by technology

Although this method has a personalized tooth movement direction, it is affected by the misalignment of the teeth before treatment. The status has a great influence, and the error The tooth movement direction pointed by the local coordinate system established by the position along its long axis is not the same as the clinically realistic movement direction pointed by the normal arrangement of teeth

Therefore, the above two methods for evaluating tooth movement are not suitable for clinical practice, and only have mathematical significance, and cannot scientifically and accurately evaluate tooth movement.

Considering that the essence of orthodontic tooth movement is the reconstruction of the alveolar bone guided by mechanical force, a tooth movement evaluation method based on the curved natural coordinate system of the alveolar bone shape was proposed (for example, refer to the following patent document 4), which The method endows the teeth with personalized biomechanical movement evaluation, but requires personalized or big data mean CBCT alveolar bone data

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