Tolidis K, Sandy J R
Department of Child Dental Health, Bristol Dental School.
Br Dent J. 1994 Sep 24;177(6):203-7. doi: 10.1038/sj.bdj.4808558.
Recent changes in the teaching of orthodontics to undergraduates and postgraduates at Bristol Dental School led us to examine treatment results achieved by undergraduates over a 10-year period. In a sample of 225 orthodontic cases (mean pre-treatment age 12.5 years) which presented for the final BDS examination there was good evidence that students were achieving acceptable treatment results before 1988. The mean percentage reduction of PAR scores for the period 1982-1987 was 64%. In contrast, in the more recent period 1988-1992, the mean percentage reduction of the PAR scores achieved by the students was 47%. This statistically significant reduction appeared to correlate with changes in teaching staffing levels since other factors such as age, type of malocclusion, appliance type or initial PAR scores were not significantly different in any of the years examined.
布里斯托尔牙科学院本科及研究生正畸教学最近的变化促使我们对本科生在10年期间取得的治疗效果进行研究。在225例接受BDS期末考试的正畸病例样本（治疗前平均年龄12.5岁）中，有充分证据表明学生们在1988年之前就能取得可接受的治疗效果。1982 - 1987年期间，PAR评分的平均降低百分比为64%。相比之下，在更近的1988 - 1992年期间，学生们实现的PAR评分平均降低百分比为47%。这种具有统计学意义的降低似乎与教学人员水平的变化相关，因为在所研究的任何一年中，年龄、错颌类型、矫治器类型或初始PAR评分等其他因素并无显著差异。
