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目的 :应用锥体束CT(CBCT)测量青少年安氏I、Ⅱ类错畸形患者髁突在关节窝中的位置,比较其间的差异。方法:选择符合实验设计的安氏I、Ⅱ类患者共90例,其中I类30例,Ⅱ类1分类30例,2分类亦为30例。研究对象摄取CBCT,使用Exam Vision软件进行关节间隙的测量,测量出髁突位于关节窝的位置,利用SPSS17.0软件包对结果进行统计学分析。结果:髁突位于关节窝的位置,安氏Ⅱ类患者较安氏I类患者前间隙大,后间隙小;安氏Ⅱ类2分类患者较1分类患者上间隙、前间隙明显增大,后间隙缩小,差异具有显著性(P<0.05)。安氏Ⅱ类患者髁突长度显著小于安氏I类患者,安氏Ⅱ类2分类者尤其短(P<0.05)。结论:青少年安氏Ⅱ类患者较I类患者髁突位置明显靠后下且髁突长度变短,Ⅱ类2分类患者尤为明显,应尽早进行正畸治疗,引导髁突回归正常位置。
OBJECTIVE: To measure the condylar position of the condyles in the Angle Class I and II malocclusion in the joint socket by using pyramidal tract computed tomography (CBCT), and to compare the differences. Methods: A total of 90 patients with Angle Class I and Type II were enrolled in this study. Among them, 30 were type I, 30 were class II and class 1 and 30 were class II. Subjects were inoculated with CBCT, the use of Exam Vision software for joint space measurement, the condylar position measured in the joint fossa, using SPSS17.0 package for statistical analysis of the results. Results: The condyles were located in the joint fossa. Class Ⅱ patients were larger than those in Class Ⅰ patients and had a small posterior gap. Class Ⅱ division 2 patients had more clearance and anterior clearance than those in group 1, The gap narrowed, the difference was significant (P <0.05). The length of condyles in Class Ⅱ patients was significantly less than those in Class I patients, especially in Class Ⅱ division 2 patients (P <0.05). CONCLUSION: Compared with type I patients, adolescent Class Ⅱ patients have significantly lower condyle position and shorter condyle length. Patients in class Ⅱ division 2 patients are more likely to have orthodontic treatment and lead condyles to normal position.