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目的探讨骨性Ⅲ类错手术与非手术边缘病例的颅面特征,为选择临床治疗方法提供参考。方法选择完成治疗的骨性Ⅲ类错边缘病例,单纯正畸组13例,手术治疗组12例,统计分析2组病例治疗前的X线头影测量值。结果Mann-Whitneyu检验显示2组下颌骨前颅底长度比Go-Me/S-N(P=0.026)、上下颌切牙的交角U1-L1(P=0.030)、Holdaway角(P=0.026)的差异有统计学意义,逐步判别分析后仅有Holdaway角能对2组进行预测区分,区分值为12°,总判别准确率为72%。结论制定骨性Ⅲ类错边缘病例治疗计划时,下颌骨前颅底长度比、上下颌切牙的交角以及软组织的凹陷度是要重点分析的颅面结构项目,小于12°的Holdaway角可以作为需手术改善软组织侧貌的初步判定指标。
Objective To investigate the craniofacial features of patients with skeletal class Ⅲ malocclusion and non-surgical margins and to provide a reference for the selection of clinical treatment methods. Methods The complete skeletal class Ⅲ malocclusion borderline cases, 13 cases of orthodontic group and 12 cases of surgical treatment group were selected for the treatment. The X-cephalometry values of two groups before treatment were statistically analyzed. Results Mann-Whitneyu test showed that the length of mandibular anterior skull base was significantly lower than that of Go-Me / SN (P = 0.026), the angles of U1-L1 (P = 0.030) and Holdaway (P = 0.026) There is statistical significance. Only the Holdaway angle can discriminate the two groups after the discriminant analysis step by step. The discriminant value is 12 ° and the total discriminant accuracy is 72%. CONCLUSIONS: The craniofacial structural items to be analyzed are mainly focused on the length of mandibular anterior skull base, the angle of the mandibular incisors and the dent of the soft tissue. The Holdaway angle of less than 12 ° As a preliminary assessment of the need to improve soft tissue profile.