【摘要】 目的：应用有限元法对比分析舌侧导板粘接位置的不同，对上切牙位移及应力产生的影响，以期寻找最适的粘接位置，为临床应用提供理论参考。方法：获取志愿者上颌骨及牙体等组织锥形束CT数据，使用Mimics、Geomagic、Creo、3 Shape和Ansys软件建立三维有限元模型。根据牙冠解剖分区，分为三组：第一组在牙冠颈1/3放置舌侧导板；第二组在牙冠中1/3放置舌侧导板；第三组在牙冠切1/3放置舌侧导板。对三组分别进行静力分析，对比三组切牙的位移趋势及应力分布差异。结果：三组数据中所有上颌切牙皆表现出压低和唇倾趋势。即：①舌侧导板粘接于牙冠颈1/3时，上切牙唇倾量最小，垂直压低量较佳；②舌侧导板粘接于牙冠切1/3时，上切牙唇倾量最大；③舌侧导板粘接于牙冠中1/3时，压低和唇倾量介于前两组之间。结论：临床使用舌侧导板时，牙冠舌面中1/3至颈1/3之间是适合的粘接区域，且越靠近颈1/3粘接，牙冠唇倾量越小，越有利于牙齿的绝对压低。更多还原

【Abstract】 Objective The objective of the study is using finite element analysis to compare the displacement and stress of maxillary incisors resulting from different bonding positions of the bite ramp.The identification of the most suitable bonding position will serve as a valuable theoretical reference for clinical application.Methods We obtained CT data of the volunteer to create a 3D finite element model.We utilized Mimics,Geomagic,Creo,3Shape,and Ansys to establish the model.There are three groups.In the first group,the bite ramp was placed on cervical of the crown.In the second group,it was placed on middle of the crown.The third group had the bite ramp placed on incisal of the crown.Static analysis was conducted on all three groups to compare the effects of different bonding positions on the displacement trend and stress distribution of maxillary incisors.Results The data from all three sets showed that there was a tendency for the maxillary incisors to intrude and lip tilt.The maxillary incisor had the smallest lip inclination and better vertical intrusion when the bite ramp on cervical of the crown.The bite ramp on incisal of the crown,the lip inclination of the crown was the largest.The bite ramp on middle of the crown,it results in moderate tooth intrude and lip tilt.Conclusion As a result,it is advisable to use bite ramp in the area between cervical and middle of the crown to adhere.Bonding closer to cervical of the crown reduces the crown lip tilt.更多还原