关键词: 骨性Ⅰ类, 骨性Ⅱ类, 髁突位置, 锥形束 CT

Abstract:

 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 ofgroup A waslarger than that ofgroup B (P<0.05). Conclusion The subjectsof skeletalclass Ⅰ show an anteriorcondyleposition. The subjectsof skeletal class Ⅱ show a posterior condyleposition.

Key words: skeletal class Ⅰ, skeletal class Ⅱ, condylarposition, cone-beam computedtomography