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- deciduous central incisor 乳中切牙
- With the loss of the alveolar height, the maximum equivalent stress and the principle stress of the upper central incisor periodontium increased. 随着牙槽骨高度的降低，上中切牙牙周膜最大等效应力和主应力逐渐增大。
- Instaneous Center of Rotation(ICR) was analyzed by defining different M/F ratios applied at the center of clinical crown of the central incisor. 用三维有限元分析法研究作用于上颌中切牙托槽部位(距切缘4.;4mm)矫治力系统中力偶矩M与舌向水平力F的比值(即M/F)与牙齿移动瞬间转动中心((ICR)之间的关系。
- A scissor bite is preferred, but a level bite is acceptable. It is not unusual to see dropped (receding) lower central incisor teeth. 如剪刀状完全吻合的咬合是最好的，咬合稍微偏差一点是可以被接受的。但上下齿看起来不可以是明显地前后落差。
- Methods: A maxillary central incisor up tocriterion was selected to construct the three-dimensional finite element model on computer. 分析不同材料桩核的修复效果。
- Methods:A maxillary central incisor model was made by three dimensional finite element method based on the average anatomic morphology of Chinese. 方法:运用有限元法建立模型,观察模型的不同部位同一载荷下受力情况。
- It is successful to build a three-dimension finite element model of a maxillary central incisor by helix CT films and scanning data. 2. 在此基础上生成了包括桩冠各组成部分和支持组织的三维有限元模型，模型具有良好的几何相似和力学相似性，完全可用于不同箍设计桩冠的力学研究。
- METHODS: Spiral CT (SCT) scanning technology, digital image transfer and transcription were used to obtain the initial 3-D data of the upper central incisor. 方法：采用螺旋CT扫描、数字影像传输与转录方法，获得中切牙三维形态的原始数据。
- RESULTS: With the loss of the alveolar height, the maximum equivalent stress and the principle stress of the upper central incisor periodontium increased. 结果：随着牙槽骨高度的降低，上中切牙牙周膜最大等效应力和主应力逐渐增大。
- Compared with restoration with traditional clasp, the stress fringe value of mesial alveolar bone of central incisor was relatively higher in restoration with attachment. 与传统卡环修复体比较，附着体修复的中切牙近中牙槽嵴应力条纹级数相对较高。
- Objective: To study how the depth and morphology of affected the dentinal stress distribution of the root of maxillary central incisor using three-dimensional-finite-element analysis. 摘要目的：应用三维有限元法研究石英纤维桩的不同外形和深度对上领中切牙桩冠修复后牙根应力分布的影响。
- Methods: The models of 3-dimensional finite element analysis (3-D FEA) of left upper permanent central incisor were designed by microtomy.Comparative studies of stress distribution were carried out. 方法： 采用切片法建立上颌左侧恒中切牙的三维有限元模型，研究3种瓷贴面复合体的应力分布。
- Impaction of the permanent maxillary central incisor is uncommon, and fusion of mandibular lateral incisors and canines is even more rarely seen. 摘要上颚正中门齿的阻生是少见的，而下颚双侧恒牙的侧门齿与犬齿融合则更少见；
- Mandibular left central incisor tooth 下颌左中切牙
- Mandibular right central incisor tooth 下颌右中切牙
- Maxillary left central incisor tooth 上颌左中切牙
- The case was a 12 years old girl with an impacted maxillary right canine and a supernumerary tooth located in between two central incisors. 本文介绍一位12岁的女孩病例，临床检查发现上颚犬齿阻生以及门齿间一颗多生牙。
- Maxillary right central incisor tooth 上颌右中切牙
- A clinical examination revealed a moderate midline diastema between maxillary central incisors. 临床检查：上中切牙间中缝，中度大小。
