论文部分内容阅读
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 To investigate the trend and stability of dislocation of hard tissue in Angle Ⅱ1 malocclusion after reduction treatment with conventional fixed appliance. Methods X-ray films of 30 patients with malocclusion of Class Ⅱ 1 deformity who were treated with conventional fixed appliances were randomly selected from 30 patients with pre-treatment and before treatment After the follow-up period (4 years after treatment), cephalometric films were measured by computer cephalometry. Paired t-tests were performed on the changes of the hard tissue profiles in these three periods. Results Before and after orthodontic treatment, the maxillary and upper incisors had statistically significant decreases (P <0.05 and P <0.01), while the mandibular condyle had no significant changes. Four years after the review showed that all measurements have different levels of recurrence. Conclusions The change of lateral condyle in the treatment of type Ⅱ1 malocclusion is mainly caused by the decrease of the maxillary and anterior superior demarcation. The change of the anterior condyle and lip inclination is the most significant. And even after a small amount of recurrence, Still with the pre-treatment measurements to maintain a significant clinical and statistical significance of differences.