Method for generating a restart of a tooth alignment treatment plan

Abstract

An aspect of the present application provides a method for generating a restart orthodontic treatment plan, comprising: obtaining a first set of M three-dimensional digital models of teeth, each representing a last M successive tooth arrangement in a previous orthodontic treatment plan of a dentition; obtaining a first three-dimensional digital model of teeth, representing a tooth arrangement of the dentition at a restart of the orthodontic treatment; and generating a restart orthodontic treatment plan based on the first three-dimensional digital model of teeth and the first set of three-dimensional digital models of teeth, wherein M is a natural number greater than 2, and the orthodontic treatment plan comprises a plurality of successive tooth arrangements from an initial tooth arrangement to a target tooth arrangement, representing a path of the orthodontic treatment.

Claims

1. A method for generating a restart tooth alignment scheme, comprising: Obtain the first set of three-dimensional digital models of teeth, which includes M three-dimensional digital models of teeth, each representing the layout of the last M teeth in the previous tooth arrangement scheme of a dental arch. Obtain a three-dimensional digital model of the first tooth, which represents the tooth layout of the dentition when orthodontic treatment is restarted; The model of at least one tooth in the first set of three-dimensional digital models of teeth is replaced with the model of the corresponding tooth in the first set of three-dimensional digital models of teeth to obtain the second set of three-dimensional digital models of teeth, which includes M three-dimensional digital models of teeth. Collision and gap optimization are performed on the last one in the second set of three-dimensional digital models of teeth to obtain a second three-dimensional digital model of teeth representing the target tooth layout of the restarted tooth arrangement scheme. Select the one from the second group of three-dimensional digital models of teeth that is closest to the first three-dimensional digital model of teeth; as well as Based on the positional differences of each moving tooth between the first three-dimensional digital model of teeth and the selected three-dimensional digital models of teeth, the positional differences of each moving tooth between the selected teeth in the second group of three-dimensional digital models of teeth and the last tooth in the second group of three-dimensional digital models of teeth, a restart tooth arrangement plan is generated. Where M is a natural number greater than 2, the tooth arrangement plan includes multiple successive tooth layouts from the initial tooth layout to the target tooth layout, representing the path of orthodontic treatment.

2. The method for generating a restart tooth alignment scheme as described in claim 1, characterized in that, The replacement is based on the ICP algorithm.

3. The method for generating a restart tooth alignment scheme as described in claim 1, characterized in that, For each moving tooth, its pose in the selected three-dimensional digital model of the tooth is closer to the target position than that in the first three-dimensional digital model of the tooth.

4. The method for generating a restart tooth alignment scheme as described in claim 1, characterized in that, It also includes: Based on the pose differences of each moving tooth between the first 3D digital model of teeth and the selected 3D digital models of teeth, the pose differences of each moving tooth between the selected teeth in the second group of 3D digital models of teeth and the last moving tooth in the second group of 3D digital models of teeth, the pose of each moving tooth in the corresponding keyframe in the restarted tooth arrangement scheme is calculated, and the restarted tooth arrangement scheme inherits the keyframe positions of the previous tooth arrangement scheme; and Based on the pose of each moving tooth in the corresponding keyframe of the tooth re-alignment scheme, the pose of each moving tooth in each step of the tooth re-alignment scheme is obtained by interpolation. Among them, the keyframe is the starting or stopping step of the spatial transformation of any tooth.

5. The method for generating a restart tooth alignment scheme as described in claim 1, characterized in that, It also includes: At least one tooth in the dentition is selected as the anchor tooth, which was fixed or moved only slightly in the previous dentition arrangement; and Using the anchored tooth as a reference, the three-dimensional digital model of the first tooth is aligned with the three-dimensional digital model of the tooth in the previous tooth arrangement plan, and the screening is performed on the basis of the alignment.

6. The method for generating a restart tooth alignment scheme as described in claim 1, characterized in that, The filtering is based on the number of steps taken.

Images