透明压膜保持器与Hawley保持器对拔牙病例的保持效果比较

目的　比较透明压膜保持器与Hawley保持器对拔牙病例保持的临床效果差异。方法　选取40例儿童患者正畸完成病例，均拔除4个第一前磨牙，正畸治疗完成后随机分为2组，各20例：A组戴用透明压膜保持器，B组戴用Hawley保持器。采集治疗刚结束(T1)及治疗完成1年后(T2)的记存模型，分别进行PAR指数评价，用SPSS 13.0软件对实验数据进行统计分析。结果　治疗完成1年后，两组间牙齿排列的保持效果显著不同(P＜0.05)，其余指标未发现显著性差异。结论　对于拔除第一前磨牙的病例，透明压膜保持器在牙齿排列的保持效果上明显优于Hawley保持器。

Using PAR score to evaluate the clinical effects of thermoplastic retainer and Hawley retainer on patients with premolars extracted

Objective To find different clinical effects of thermoplastic retainer and Hawley retainer.Methods 40 children patients were chosen after orthodontic treatment with the first premolar extracted.20 patients wore thermoplastic retainer after their treatment(Team A),while 20 patients wore Hawley retainer(Team B).The models were collected on debonding day(T1) and one year after treatment(T2).The data were analysed with SPSS 13.0.Results There were no significant differences between the two groups,except for too...