Conclusion The hemisection can get satisfactory effect to repair the first mandibular molar with distal tooth reservated by selecting suitable tooth.
结论采用半切术技术保留下颌第一磨牙远中根的修复可获得满意效果。
Objective:To evaluate the contribution of radiogram in diagnosis of primary vertical root facture in mandibular first molar.
目的：评价直接数字化影像技术在下颌第一磨牙牙根纵裂诊断中的作用。
Results All parameters of 14 teeth were achieved The parameter of TM in mandibular incisor was the highest and in mandibular first molar lowest.
结果得到右侧上下颌14颗牙的牙动度参数的正常范围，其牙动度参数的均值以下颌前牙最大，下颌第一磨牙最小。
ObjectiveTo observe the effects of the two kinds of rigid fixed bridge design on the stress of the alveolar bone of mandibular first molar after hemisection.
目的观察下颌第一磨牙半切术后两种双端固定桥修复对牙槽骨应力分布的影响。
The fistula was connected with mandibular body but the first molar.
外斜线相连，与下颌第一磨牙根尖不相通连。
The fistula was connected with mandibular body but the first molar.
颊瘘与外斜线相连，与下颌第一磨牙根尖不相通连。
The three dimensional finite element method models of the mandibular first molar was constructed on the computer, which had 63715 nodes and 41676 tetrahedrons elements.
在计算机上建立了下颌第一磨牙三维有限元模型，总节点为63 715个，4面单元数为41 676个。
Methods: with the help of the POWERSHAPE and ANSYS software, we established 3d dentition FEA models with right mandibular first molar missing and fixed partial denture.
方法：在POWERSHAPE及ANSYS软件的帮助下，建立右下第一磨牙缺失及局部固定义齿的三维有限元模型。
Methods: with the help of the POWERSHAPE and ANSYS software, we established 3d dentition FEA models with right mandibular first molar missing and fixed partial denture.
方法：在POWERSHAPE及ANSYS软件的帮助下，建立右下第一磨牙缺失及局部固定义齿的三维有限元模型。
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