Objective: To investigate the differences in the condylar position of subjects with skeletal class I and skeletal class II. To provide a basis of diagnosis and treatment.
Methods: Group A was composed of 50 subjects with skeletal class I (27 males and 26 females; age range = 18 years to 30 years; mean age=26 years). Group B comprised 50 subjects with skeletal class II (24 males and 26 females; age range = 18 years to 28 years; mean age=25 years). The condylar position and the shapes of the condyle and the glenoid fossa were linearly measured on the sagittal and coronal sections by cone-beam computed tomography (CBCT). Data were analyzed by SPSS 19.0.
Results: No statistically significant differences were found in the measurements of the condylar position between the sides of each group on the sagittal plane and the coronal plane (P > 0.05). There were significant differences on the anterior space and the posterior space between group A and B (P < 0.05). The A/P joint space ratio of group A was larger than that of group B (P < 0.05).
Conclusion: The subjects of skeletal class I show an anterior condyle position. The subjects of skeletal class II show a posterior condyle position.
目的: 比较骨性Ⅰ类和骨性Ⅱ类受试者的髁突位置，为临床诊断与治疗提供指导。
方法: 选择50例骨性Ⅰ类受试者（A组，男27例，女23例，年龄18~30岁，平均年龄26岁）和50例骨性Ⅱ类受试者（B组，男24例，女26例，年龄18~28岁，平均年龄25岁）。两组均拍摄锥形束CT（CBCT）并应用相应软件进行测量分析，测量髁突位置相关测量项目。所有数据采用SPSS 19.0统计学软件进行统计分析。
结果: A组和B组双侧髁突位置测量值差异无统计学意义（P>0.05）；A组前后间隙与B组相比较，差异有统计学意义（P<0.05）；A组前后间隙比较B组大，差异有统计学意义（P<0.05）。
结论: 骨性Ⅱ类受试者相对骨性Ⅰ类受试者髁突位置为居中位偏后。