Kerr W J, McColl J H, Frostick L
Glasgow Dental Hospital and School.
Br Dent J. 1996 Jul 6;181(1):18-22. doi: 10.1038/sj.bdj.4809142.
One hundred and fifty removable appliance cases consecutively sampled by the Scottish Dental Practice Board were analysed using the PAR index. The cases were assessed as being suited or unsuited to the removable appliance approach based on the presenting features previously shown to be effectively treated by removable appliances. Using chi-squared tests of association, suitable cases were characterised as being in the mixed dentition, had one feature treated and one appliance used. Suitable cases on average showed 3-4 PAR points more improvement as a result of treatment than equivalent unsuitable cases; regression equations are given. Because of the wide variability within the sample it proved impossible to predict accurately the expected duration of treatment in the General Dental Service.
苏格兰牙科执业委员会连续抽取了150个可摘矫治器病例，采用PAR指数进行分析。根据先前显示可通过可摘矫治器有效治疗的呈现特征，将这些病例评估为适合或不适合采用可摘矫治器治疗方法。使用卡方关联检验，适合的病例特征为处于混合牙列期，治疗一个特征且使用一个矫治器。与同等不适合的病例相比，适合的病例经治疗后平均PAR得分改善多3 - 4分；给出了回归方程。由于样本内差异较大，事实证明无法准确预测普通牙科服务中预期的治疗时长。
