摘要
目的:利用三维CT重建技术分析骨性Ⅲ类偏颌患者颌面部硬组织的对称性,研究造成颏部偏斜的主要骨性因素。方法:选择女性成人骨性Ⅲ类偏颌患者41例,根据颏点偏斜程度,将其分为实验组(偏斜超过4mm)和对照组(偏斜不足4mm)。三维CT成像后,测量并分析2组间及组内两侧的中面部、下颌骨结构的对称性差异。采用SPSS13.0软件包对数据进行配对t检验和Pearson相关分析。结果:⑴实验组偏斜侧U3及U6的垂直向位置显著高于对侧(P<0.01);2组间比较,上颌两侧牙槽高度之差具有统计学意义(P<0.01)。⑵实验组偏斜侧长度显著小于对侧及对照组偏斜侧(P<0.01),下颌角向上旋转(P<0.01);对侧明显向前、内侧倾斜(P<0.01),下颌角位置偏前、内侧(P<0.05)。⑶颏点偏斜与偏斜侧高度、两侧升支高度差异等骨性因素明显相关。结论:与偏斜侧相比,对侧升支生长过多,向前、内侧倾斜是导致骨性Ⅲ类偏颌患者颏部偏斜的主要骨性因素。
PURPOSE： To investigate the skeletodental factors relating to the chin point deviation of facial asymmetry in skeletal Class Ⅲ malocclusion patients using three-dimensional computed tomography. METHODS： Forty-one adult female patients with class Ⅲ malocclusion, who underwent three-dimensional CT examination before orthodontics treatment, were assigned as group of symmetry or group of asymmetry according to the amount of chin point deviation from the facial midline. Midfacial and mandibular variables were measured. The data was analyzed with SPSS13.0 software package. RESULTS： Patients in the group of asymmetry showed higher positions of the upper canine and first molar, shorter ramus height, more superior positioning of gonion on the deviated side, more mesial and frontal inclination of the ramus, medial and frontal positioning of gonion on the opposite side than the group of syrmnetry. Menton deviation correlated significantly with the difference of ramus height between the 2 sides ramus, ramus height in the deviated side and other skeletodental factors. CONCLUSIONS： Facial asymmetry in Class Ⅲ patients is due to the overgrowth,frontal and mesial inclination of the ramus in the opposite side.
出处
《上海口腔医学》
CAS
CSCD
2010年第1期6-10,共5页
Shanghai Journal of Stomatology
基金
山东省自然科学基金(Y2005C22)~~
