The Adjustment Method of Rotation Pivot in Orthodontics

Abstract

The invention provides a method for adjusting the fulcrum of rotation in orthodontics, which includes the following steps: S1, determine the occlusal surface according to the tooth model; S2, generate the occlusal axis according to the occlusal surface; S3, obtain the initial position of each tooth Normal axis and tangential axis; S4, calculate the center point of the intersection contour line between the occlusal surface and the surface model of the tooth, and the center point forms the fulcrum of tooth rotation; S5, generate the initial spin axis of the tooth; S6, parallel to the occlusal surface And pass through the plane of the tooth rotation fulcrum, move the normal axis so that the normal axis is parallel to the buccal-lingual or labial-lingual direction; S7. Adjust the self-rotation axis so that it passes through the tooth rotation fulcrum so that it perpendicular to the normal axis and the tangential axis in step S6. The present invention can overcome the problem that the actual orthodontic effect is not consistent with the expected one. It is based on simultaneous modeling of the crown and root, and effectively adjusts the rotation fulcrum according to the established modeling of the crown and root, thereby obtaining the most ideal orthodontic effect .

Description

technical field [0001] The invention relates to the technical field of orthodontics, in particular to a method for adjusting a rotational fulcrum in orthodontics. Background technique [0002] At present, for orthodontics, the crown surface model can be segmented from the patient's intraoral scan data, and the crown surface model can be rotated and translated to align the teeth, and then generate a sequence of teeth, and finally, according to the sequence of teeth Manufactured a series of aligners. [0003] The above-mentioned orthodontic methods mainly rely on the accuracy of the tooth surface model and the tooth rotation fulcrum. However, currently there is no tooth root model in the tooth arrangement process, so the rotation fulcrum can only be at the bottom of the crown surface model or other fixed positions. The above-mentioned rotation fulcrum is likely to be inconsistent with the fulcrum in the actual orthodontic process, so the generated braces act on the patient, w...

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned orthodontic methods mainly rely on the accuracy of the tooth surface model and the tooth rotation fulcrum. However, currently there is no root model in the process of tooth arrangement, so the rotation fulcrum can only be at the bottom of the crown surface model or other fixed positions

However, the above rotation fulcrum is likely to be inconsistent with the fulcrum during the actual orthodontic process, so the generated braces act on the patient, which may cause the orthodontic (rotation) direction of the patient to be inconsistent with the expectation during the treatment process.

In this way, in mild cases, the correction effect is not ideal, and in severe cases, the teeth may even move out of the alveolar bone, resulting in serious medical accidents

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