A method and device for analyzing the force of a tooth model simulating wearing an appliance

Abstract

The invention discloses a force analysis method for a tooth model simulating wearing an orthodontic appliance, which comprises the following steps. Step S110: collecting intraoral scan data to generate a basic orthodontic model. Step S120: Virtually generate a periodontal ligament geometric model on the basic orthodontic model. Step S130: Determine the constitutive model of the periodontal ligament, and establish a finite element model of the periodontal ligament. Step S140: use the finite element method to simulate and calculate the movement of the teeth, compare the tooth movement collected in the experiment, and determine the undetermined parameters in the periodontal ligament constitutive model. Step S150: Obtain a complete orthodontic model. Step S160: Using the finite element method to simulate and calculate the force distribution of the teeth after they are fitted with the appliance. Step S170: According to the force distribution of the teeth, simulate the alveolar bone remodeling and tooth movement after the teeth are stressed. The invention establishes a complete orthodontic model including the periodontal ligament, and performs simulation calculation on the teeth after wearing the appliance, 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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