SO SÁNH ĐẶC ĐIỂM HÌNH THÁI BỀ MẶT LỒI CẦU Ở NHÓM SAI KHỚP CẮN ANGLE HẠNG II CHI 2 VÀ NHÓM KHỚP CẮN BÌNH THƯỜNG TRÊN HÌNH ẢNH CBCT

Abstract

Objective: To compare the condylar articular surface morphology of the temporomandibular joint between individuals with Class II Division 2 malocclusion and those with normal occlusion. Subjects and Methods: A descriptive cross-sectional study was conducted on 40 adults (aged 20–31 years; 22 males and 18 females), divided into two groups: Class II Division 2 (n = 20) and normal occlusion (n = 20). Each participant underwent CBCT imaging of the temporomandibular joint, and the condylar articular surface morphology was assessed separately for each side according to the method of Peyron and Altman (1992). Results: In the Class II Division 2 group, on the left side, normal condylar surfaces accounted for 50%, flat surfaces 30%, worn surfaces 15%, and surfaces showing bone resorption 5%, with no cases of osteophytes or sclerosis. On the right side, the corresponding proportions were 40%, 25%, 20%, 10%, and 5%, with no sclerosis observed. In the normal occlusion group, on the left side, normal condylar surfaces accounted for 80%, flat surfaces 15%, and worn surfaces 5%. On the right side, normal surfaces accounted for 85%, flat surfaces 10%, and worn surfaces 5%. No cases of osteophytes, sclerosis, or bone resorption were observed. Differences between groups were statistically significant on the right side (p < 0.05), but not on the left side (p > 0.05). Conclusion: On the right side, condylar articular surface morphology differed significantly between the two groups, with the Class II Division 2 group showing a lower proportion of normal surfaces compared to the normal occlusion group. On the left side, no statistically significant difference was observed.