Three - Dimensional Finite Element Analysis Of Stress In Maxillary Ectopic Lateral Incisors And Periodontal Tissues

[Abstract] Objective: To explore the application of self-locking and correcting device inthe process of the correctional treatments, Force under the action of teeth in theorthodonticcorrection, Maxillary ectopic stress and displacement of the lateral incisors. This experime-nt used the three dimensional finite element method Establishes the high accuracy of Selfligating appliance maxillary dentition and periodontal tissue by means of the three dimens-ional l finite element method, Study the beginning of orthodontics ectopic maxillary late-ral incisor the stress in the periodontal tissues and tooth displacement[.Methods]: Multi slice spiral CT scanning of maxil-la for maxillary teeth andperiodontal tissue data, through the Mimics software to establish accurate maxillarydentition,periodontal membrane,alveolar bone, self-locking brackets,arch wire on Threedimensional finite element model.Including periodontal membrane for root evenly extendoutward form0.25mm Clinical treatment simulation wire into the bracket process tomeasure the tooth stress through the arch wire deformation, Analysis of maxillary lateralincisor correction in the process of peri-odontal tissue stress and displacement of the teeth.[Result]: In the early in use0.012inch NITI orthodontic tooth root stress is mainly theroot1/3and root at the central junction, periodontal membrane stress mainly for tooth neck,the stress of the alveolar bone is relatively complex, tooth movement for the tilt movement.In the late in use0.019×0.25inch wire orthodontic tooth root stress is mainly the middleof the root, periodontal membrane stress mainly for tooth neck, the stress of the alveolarbone is relatively complex, tooth movement for the tilt movement.[Conclusion]: According to the finite element modeling, stress analysis, Get orthodonticforce under the action of ectopic lateral incisor and the periodontal ligament, alveolar bonestress. One side cut fang root surface stress value is the largest, followed by alveolar boneand periodontal membrane stress is small.According to the ectopic lateral incisor and stress conditions, Lateral incisor indifferent phases of correctional tooth root stress biggest area for the tip of the root and rootin central, Periodontal membrane maximum stress area for tooth neck, The greatest stressarea in the alveolar bone for alveolar ridge top. According to the displacement of the tooth, the teeth is tilt movement. But due to thesame site compression and compression is different in different periods, tilt the direction ofthe movement is not the same. Therefore, in the course of clinical treatment the doctor canbe selected appropriate method to get the best treatment effect.