安格尔Ⅱ^1类减数矫治：我们到底能引起哪些硬组织侧貌的改变？

Extraction treatment of Class Ⅱ~1 cases: What can we change the patient's hard tissue profile?

目的 探讨安氏Ⅱ1类错畸形在用常规固定矫治器进行减数治疗后硬组织侧貌突度的变化趋势及其稳定性。方法 随机提取 30例经拔除 4个双尖牙用常规固定矫治器治疗的安氏Ⅱ1类青少年错畸形患者的X光片为研究对象 ,以 3人重复定点的方法对样本的治疗前、治疗后、随访期 (治疗后 4年左右 )的头颅侧位片进行计算机头影测量 ,并对这三期的硬组织侧貌变化情况进行配对t检验。结果 正畸治疗前后 ,上颌及上切牙突度均发生有统计学意义的减小 (P <0 .0 5及P <0 .0 0 1 ) ;而下颌骨突度基本没有变化。四年后复查显示 ,所有测量项目均有不同程度的复发。结论 Ⅱ1类错减数治疗后侧貌突度的改变主要为上颌及上前牙突度的减小 ,其中上前牙突度及唇倾度的改变最为显著 ,且即使在少量复发后 ,仍与治疗前的测量结果保持显著的临床及统计学意义的差别。

Objective [WT5”BZ]To evaluate hard tissue profile changes and stability in the Class Ⅱ 1 cases after extraction treatment with conventional fixed appliance.[WT5”HZ]Methods [WT5”BZ]Thirty Class Ⅱ 1 extraction cases were chosen as study sample. Computerized cephalometrics on X ray films before treatment, after treatment and after 4 year following up were performed repeatedly by three authors. The changes were compared by paired t test.[WT5”HZ]Results [WT5”BZ]After treatment: SNA reduced 1.0° (p< 0.05 ),U 1 PP reduced 14.9° (p< 0.001 ),U 1 FHV reduced 3.1mm (p< 0.001 ), SNPg increased 0.04° (p> 0.05 ). After following up: SNA increased 0.05° (p> 0.05 ),U 1 PP increased 3.9° (p< 0.05 ),U 1 FHV increased 0.9mm (p> 0.05 ),SNPg increased 0.6° (p< 0.05 ).[WT5”HZ]Conclusion [WT5”BZ]The main changes of extraction treatment in the Class Ⅱ 1 cases were the reduction of maxillary prominence, especially the prominence and the proclination of upper anterior teeth, which even after small relapse, still showed significantly statistical and clinical differences compared with pre treatment measures. [WT5”HZ]