目的：为了探讨悬臂梁的存在及其长度对种植牙周骨界面应力传递、分布规律的影响。
Objective: To investigate the influence of cantilever lengths on the load transfer and stress distribution patterns of the interface between the bone and dental implants.
方法用根尖定位仪测量36例患牙的每个根管工作长度，并进行比较。
Methods We used the root apex locator to measure work length of each root canal of 36 cases and compared the measured results.
更多选择：除标准规格外，可根据需要订制螺纹长度及其它螺牙标准准。
More options: besides standard specifications, thread length and other specification can be made according to order.
对选择适宜长度的牙种植体，避免牙种植体损伤下牙槽神经等具有重要意义。
It is significant for choosing appropriate length of dental implantation, which avoid the injury for the inferior alveolar nerve.
目的：统计分析下颌第一、第二、第三磨牙牙冠近远中宽度、牙体长度、分根情况以及相关因素。
Objective: Statistical analysis of mandibular molar mesiodistal crown width and tooth length and development of root.
结果：种植体长度变化对种植体周围骨界面及牙槽骨应力的大小有较大的影响，两者呈负相关关系；
Results: A negative correlation between implant diameter or length and the strees distribution in the implant-bone interface or the alveolar bone was found.
实验组102颗牙180个根管，用根管长度测量仪测量其工作长度，进行根管预备和充填，术后拍片；
The experiment group for 102 cases with 180 roots, applying root length surveyor test its working length, undertake root preparing and filling up, took X ray after operation;
实验组102颗牙180个根管，用根管长度测量仪测量其工作长度，进行根管预备和充填，术后拍片；
The experiment group for 102 cases with 180 roots, applying root length surveyor test its working length, undertake root preparing and filling up, took X ray after operation;
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