内蒙古地区成年人下颌骨三维CT测量及分析

目的 为成人下颌骨缺损修复重建、重塑面部骨骼整体形态提供解剖学参数。 方法 招募志愿者49例（男21例，女28例），收集71例下颌骨干骨标本进行CT扫描，使用Mimics软件建立内蒙古地区人120例下颌骨三维模型，测量120例内蒙古地区人下颌骨指标，并将下颌骨数据作两侧比较、男性与女性比较以及与现代华北地区下颌骨数据比较。 结果 男、女志愿者双侧所有测量数据的均无统计学差异（P>0.05），下颌骨各项测量数据除下颌角外均为男性大于女性，下颌角女性大于男性。 结论 内蒙古地区人群较华北其他地区人群下颌骨更宽、下巴更为突出，下颌角小，咀嚼肌力量大；为内蒙古地区人群设计下颌骨假体时，设计为下颌体厚，矢状面横截面积较大，体高与下颌支高较小的形态更为合适。 【关键词】 下颌骨； 三维测量； 内蒙古地区

Three-dimensional CT measurement and analysis of mandible in adults in Inner Mongolia

Objective To provide anatomical parameters for adult mandibular defect repair, reconstruction and facial bone remodeling. Methods A total of 49 volunteers (21 males and 28 females) were recruited. Seventy-one mandibular shaft specimens were collected for CT scanning. Mimics software was used to establish three-dimensional models of mandible for 120 cases from Inner Mongolia, and mandible indexes of 120 cases from Inner Mongolia were measured. The mandible data of 120 cases from Inner Mongolia were compared bilaterally, in male and female, with modern mandible data from North China. Results There were no statistical differences in all bilateral measurements between male and female volunteers (P>0.05), except for mandibular angle, male was larger than female, and female was larger than male in mandibular angle. Conclusions Compared with other areas of North China, Inner Mongolia population has wider mandible, more prominent jaw, smaller mandibular angle and stronger masticatory muscle. When designing mandibular prosthesis for people in Inner Mongolia, it is more appropriate to design the shape of thick mandibular body, large sagittal cross-section area and small body height and mandibular ramus height.