【摘要】 目的:通过有限元分析方法对T型曲作用下上颌各牙齿的位移趋势和牙根及牙周支持组织内的应力分布规律进行研究,为临床治疗中合理选用矫治力系统以便有效地控制牙齿移动类型提供可靠的理论依据。方法:通过有限元方法分析标准T型曲打开1mm情况下牙齿初始位移和牙齿及牙周支持组织的应力分布规律。结果:T型曲作用下前、后牙段均有伸长且各牙均表现为倾斜移动,冠部大于根部。结论:①在T型曲作用下前后牙段各牙的应力分布规律基本相同(牙根表面应力最大,齿槽骨表面次之,牙周膜应力最小)。②在T型曲作用下,上颌前、后牙段各牙均表现为倾斜移动,冠部大于根部。③T型曲关闭间隙时会引起上前牙伸长至覆牙合加深。更多还原

【Abstract】 Objective This study is designed to investigate the displacement trend of each maxillary tooth and the stress distribution on the root and periodontal tissues and under the action of T-loop through three-dimensional finite element approach so as to provide reliable theoretic basis for the appropriate selection of correcting system to achieve effective displacement control. Methods To analyze through finite element method the initial displacement and the stress distribution on each tooth and periodontal tissues when standard T-loop pulling 1mm. Results Both anterior and back teeth are protracted and all teeth take on tipping movement under the action of T-loop, with crown’s displacement larger than root’s. Conclusion ① The stress distributions on anterior and back teeth under the action of T-loop are similar. The stress on the surface of roots is the greatest, following by the surface of alveolar bone and the periodontal ligament.②Both anterior and the posterior teeth take on tipping movement under the action of T-loop, with crown’s displacement larger than root’s.③The anterior teeth were protracted when T loop was activatied,which will result in the deeper overbit.更多还原