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目的:探讨替牙晚期骨性III类错矫治对颞下颌关节的影响。方法:选择替牙晚期骨性Ⅲ类错患者32例,施行前方牵引联合直丝弓矫治技术,矫治前后均做Helkimo主诉症状指数分析和头影测量分析。结果:矫治后患者Helkimo指数分布发生了明显改变,Ai 0级比例明显升高,AiⅡ级比例减少为零。矫治后Co-y距、Y轴角、ANB角等明显增大(P<0.05);Co-x距、SNB角、NP-FH角等明显减小(P<0.05);且N-S-Ar角、N-S-Go角、N-S-Pg角变化值为依次增加。结论:替牙晚期骨性Ⅲ类错矫治对患者Helkimo主诉症状有改善作用。矫治后髁突点发生了向后上的位移,下颌生长受到抑制,下颌的位置相对后移,以髁突为中心发生了顺时针旋转。
Objective: To investigate the effect of advanced skeletal Class III malocclusion treatment on temporomandibular joint. Methods: Thirty-two patients with advanced skeletal Class Ⅲ malocclusion were selected and treated with anterior traction combined with straight arch appliance. Helkimo symptom index and cephalometric analysis were performed before and after treatment. Results: After treatment, the distribution of Helkimo index changed obviously, the ratio of Ai 0 grade was significantly increased, and the Ai Ⅱ grade proportion was reduced to zero. Co-y distance, Y-axis angle and ANB angle were significantly increased (P <0.05); Co-x distance, SNB angle and NP-FH angle were significantly decreased , NS-Go angle, NS-Pg angle changes in order to increase. Conclusion: The treatment of advanced skeletal Class Ⅲ malocclusion with tooth decay improves the symptoms of Helkimo complained in patients. After correction, the posterior condylar point displacement occurred, the growth of the mandibular is inhibited, the position of the mandible relatively backward, with the condyle as the center of a clockwise rotation occurred.