CAJ | 학술논문

背景:微螺钉种植体虽然能提供强支抗,但控制牙齿的三维移动存在不足.Tomas 微种植钉的顶部设计成十字形,可固定方形弓丝,从而利用方丝控制牙齿的三维移动,目前对于研究 Tomas 微种植钉此方面的研究尚未见报道.目的:观察 Tomas 微种植体复合矫治力系统对竖直倾斜磨牙的影响.方法:对上颌第二恒磨牙向近中、颊侧倾斜的干燥头颅骨进行多层螺旋 CT 扫描,利用有限元软件建立上颌第二恒磨牙及其牙周支持组织的三维有限元模型,观察计算机模拟微种植体位于不同位置、施加不同的远中向力值和根颊向力偶矩值作用下磨牙牙周膜 Von Mises 应力.结果与结论:牙周膜的最大应力均出现在上颌第二恒磨牙颈部,沿着根尖的方向应力逐渐减小,在2个牙根的根尖处未出现应力集中.提示实验所建立的有限元模型达到了几何相似性和生物力学相似性,可用于精确的生物力学分析;Tomas 微种植体可控制牙齿的移动方式.
배경:미라정충식체수연능제공강지항,단공제아치적삼유이동존재불족.Tomas 미충식정적정부설계성십자형,가고정방형궁사,종이이용방사공제아치적삼유이동,목전대우연구 Tomas 미충식정차방면적연구상미견보도.목적:관찰 Tomas 미충식체복합교치력계통대수직경사마아적영향.방법:대상합제이항마아향근중、협측경사적간조두로골진행다층라선 CT 소묘,이용유한원연건건립상합제이항마아급기아주지지조직적삼유유한원모형,관찰계산궤모의미충식체위우불동위치、시가불동적원중향력치화근협향력우구치작용하마아아주막 Von Mises 응력.결과여결론:아주막적최대응력균출현재상합제이항마아경부,연착근첨적방향응력축점감소,재2개아근적근첨처미출현응력집중.제시실험소건립적유한원모형체도료궤하상사성화생물역학상사성,가용우정학적생물역학분석;Tomas 미충식체가공제아치적이동방식.
BACKGROUND: Although mini-screws anchorage implant can provide strong anchorage, it cannot control the three-dimensional movement of the tooth. Tomas-pin can be fixed in a square archwire and designed into a cross, in order to control the three-dimensional movement of the tooth. And this research has not been reported. OBJECTIVE: To investigate the effects of combined force for maxil ary second molar uprighting with micro-implant anchorage system. METHODS: Maxil ary second molar and tipped mesiobuccal y were selected to be the tooth sample, and maxil ary which corresponds with sample tooth was also selected to be the alveolar bone sample. Multi-slice spiral CT scanning was taken for both of samples to get legible and accurate image information. A three-dimensional model of maxil ary second molar with periodontal tissues was established by finite element software. Effects of embedding position of micro-implant, orientation of the loading force and loading force on the Von Mises stress of the periodontal tissue were investigated. RESULTS AND CONCLUSION: The maximum stress of the periodontal ligament was detected in the cervix of the maxil ary second molar, and the stress was gradual y decreased along with the apical. However, stress concentration could not be found in the apex of each root. The finite element model could be exhibited similarity in geometry and biomechanics, and could be used for the precisely biomechanics analysis. The bodily movement or tipping movement can be achieved with Tomas-pin.