Stress analysis method and device for tooth model for simulating wearing of appliance

Abstract

The invention discloses a stress analysis method for a tooth model for simulating wearing of an appliance. The method comprises: S110, collecting intraoral scanning data, and generating a basic orthodontic model; S120, virtually generating a periodontal ligament geometric model on the basic orthodontic model; S130, determining a periodontal ligament constitutive model, and establishing a finite element model of the periodontal ligament; S140, simulating and calculating the movement amount of teeth by using a finite element method, comparing with the tooth movement conditions acquired by experiments, and determining the to-be-determined parameters in the periodontal ligament constitutive model; S150, obtaining a complete orthodontic model; S160, simulating and calculating a stress distribution condition of the teeth after the teeth are worn with a appliance by using a finite element method; and S170, simulating alveolar bone reconstruction and tooth movement conditions after the teeth are stressed according to the tooth stress distribution conditions. According to the invention, a complete orthodontic model containing periodontal ligament is established, and simulation calculation is carried out on teeth after a appliance is worn, so that the process of orthodontic treatment can be simulated on the biomechanical level.

Description

technical field [0001] The invention relates to a computer-aided design technology, in particular to a method for computer-aided generation of a tooth orthodontic model and using the tooth orthodontic model for tooth force analysis. Background technique [0002] Orthodontics is aimed at tooth alignment deformity or malocclusion, using fixed orthodontic appliances composed of arch wires, brackets, etc., or removable invisible orthodontic appliances, to apply three-dimensional orthodontic force and torque to the teeth, and adjust the facial bones, teeth and The balance and coordination among the three maxillofacial muscles can improve facial shape, align teeth and improve masticatory efficiency after a period of orthodontic treatment. [0003] Regardless of whether it is fixed correction or invisible correction, in the stage of correction, the doctor's experience is usually used to formulate a correction plan. The method is to manually cut each tooth on the dental model after...

AI Technical Summary

Problems solved by technology

Collecting 3D image data of soft and hard tissues of patients, performing diagnostic analysis and treatment prediction, cutting and aligning teeth through computer simulation, and finally realizing the personalized production of the orthodontic system, is becoming the development direction of 3D digital orthodontics. The operation method is controlled by computer simulation software. Due to the large intraoral differences of different patients, it is impossible to accurately predict the alignment effect when encountering some complicated cases. In addition, clinicians can modify the virtual correction process according to clinical experience, but This method is related to the doctor's personal experience value. The modification process output by different doctors may be different, and it cannot be quantified and unified.

[0005] For simulating the process of digital tooth arrangement, the digital jaw model and digital alveolar bone model used in the prior art are used for virtual design. Peripheral membrane is soft tissue, and its changes during tooth movement are difficult to simulate. Therefore, in the current virtual orthodontic process, only the tooth model and alveolar bone model are used to simulate the orthodontic process. The above method deviates from the actual tooth movement process. , if the simulation design is improper, after wearing the appliance, if the actual correction result deviates greatly from the treatment plan, it is easy to cause damage to the patient

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