安氏Ⅲ类错[牙合]的颅面形态研究.pdfVIP

第42卷 第3期 哈尔滨医科大学学报 v01．42。No．3 2O08年6月 JOURNAL OF HARBIN MEDJCAL I矾n，ERSⅡTY Jun．．撇 安氏Ⅲ类错殆的颅面形态研究 刘 洋，邵 坪 (哈尔滨医科大学13腔医学院正畸科，黑龙江哈尔滨150001) [摘要】 曰的 将几何形态测量学引入口腔正畸领域来探讨颅底、下颌形态在骨性Ⅲ类错殆形成中的作用。方法 随机选取恒牙初期骨性Ⅲ类与I类错胎患者头颅侧位片各30张，描记颅底的9个标志点及下颌的15个标志点， 数字化后采用Procrustes重叠法、薄板曲线法、欧式距离矩阵法和常规头影测量法，对骨性Ⅲ类与I类错殆患者的颅 底形态及下颌形态进行比较。结幕 Ⅲ类错殆组后颅底变化显著，水平向向前缩窄，垂直向向下延长，前颅底长度 变小，sSe段上扬，颅底角无变化，髁状突长度、升支高度、下颌体长度增加，颞颌关节、颏部都靠前，下切牙代偿性 的倾斜来掩饰骨骼畸形。结论 Ⅲ类错殆的颅底、下颌形态各有特点，并影响Ⅲ类错殆的形成。 [关键词】 Ⅲ类错殆；颅底；下颌骨；几何形态测量法 [中图分类号】R783．5 [文献标识码]A [文章编号]1000—1905(2008)03—0296—04 LIU Yang，SHAO Ping (Department ofOrthodontics，School ofStomatology，Harbin Medical University，Harbin 150001，China) Abstract：Ohm：tire To explore the function of cranial base and mandible in dass m malooclusion by intro— ducing geometric morphometric analysis．Methods The lateral·cephalograms of 60 skeletal class I and class m malocclusion were~lected randomly．The cephalograms were traced and 9 homologous landmarks on cranial base and ifhomologous landmarks on mandible weIe identified and digitized．Procrustes superimposition，thin— plate spline，euclidean distance matrix and conventional cephalometrics cnalysis were performed to compare the diffemn~s in cranial base and mandible morphology of subjects between class I and class m malocclusion．Re— mlts The greatest difference in morphology occurred in the posterior cranial base region，which consisted of vertical expansion，horizontal compression，and size contraction in class m．Horizontal direction constricted for- ward，vertical direction extend downwards，the length of the anterior cranial base changed shortly，and s-Se cklI1ged upwards．Cranial base re,on remained the