Objective: This study took use of CBCT (Cone Beam Computed Tomography) to measure and to analyze the lingual concavity of the mandibular posterior region. When implanted in the mandibular posterior region, it provided some certain imaging references to preoperative diagnosis design and effective avoidance of concavity. Methods: According to the inclusion and discharge criteria, 318 of CBCT raw datas were there for measurement, upon which statistical analysis was performed through SPSS 22.0 statistical software package. Results: 1. The incidence of concavity was statistically different from age and tooth position. 2. The indentations of different tooth positions were statistically different in the ABC area for different teeth. 3. There were statistical differences among three groups of measurements from different tooth positions. 4. The three groups of measurements in the ABC area were statistically different.Conclusion: This study suggested that when large concavity occurred in the AB region, the chance of lingual perforation increased. Another finding of this study was that in the position of the second premolar of the lower jaw, sometimes there was a large undercut on the lingual side, and simultaneously an undercut on the buccal bone wall would be there, the rigorous design before surgery was especially important together with the presence of the buccal pupil.%目的:使用CBCT测量分析, 为术前有效规避倒凹提供一定的影像学参考.方法:按照纳入和排出标准, 选取了318例患者进行测量.采用SPSS22.0统计软件进行统计学分析.结果:1.倒凹的发生率与年龄、牙位有统计学差异.2.不同牙位的倒凹所在ABC区域具有统计学差异.3.不同牙位之间三组测量值均具有统计学差异.4. ABC区域的三组测量值情况均具有统计学差异.结论:当AB区域出现大的倒凹时, 发生舌侧穿孔的几率会增加.在下颌第二前磨牙的位置, 有时舌侧会存在较大的倒凹, 这时颊侧骨壁上也出现倒凹, 再加上颊侧颏孔的存在, 这时术前严谨的设计显得尤为的重要.
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