直丝弓与方丝弓矫治器的疗效比较

目的 应用PAR指数评价直丝弓矫治器与方丝弓矫治器的治疗效果。方法 选取北京大学口腔医院正畸科1994-2001年采用直丝弓或方丝弓双颌固定矫治器完成治疗的错畸形患者80例，对治疗前后模型进行PAR指数测量，记录治疗前后PAR分值及其差值，以治疗前相同的PAR总分值和拔牙、非拔牙矫治方式将患者进行配对分组，分为直丝弓组和方丝弓组，每组40例，对两组患者的测量数据进行统计学检验。结果 治疗后直丝弓组后牙排列的PAR分值低于方丝弓组（P＜0.01），后牙排列效果较方丝弓组好。两组患者治疗后其余各项PAR分值及治疗前后PAR差值均无统计学差异（P＞0.05）。直丝弓组平均疗程缩短3.95个月。结论 直丝弓矫治器对牙齿排列尤其是后牙的定位较准确，在较短的时间内可取得与方丝弓矫治器相同的治疗效果，矫治效率较方丝弓矫治器高。

Comparison of Straight Wire Appliance versus Edgewise Appliance in Orthodontic Treatment Outcome

Objective To investigate the difference between straight wire appliance and edgewise appliance treatment outcome. Methods 80 cases finished with two-arch straight wire or edgewise appliance between 1994 and 2001 were selected. The PAR index on pre- and post-treatment dental casts and PAR score was recorded respectively. According to the same pre-treatment PAR score and extraction pattem, the samples were divided into two groups, straight wire group and edgewise group, and each group had 40 cases. The data were analyzed statistically. Results Estimated with the post-treatment PAR score of posterior teeth alignment, the treatment with straight wire appliance was lower than that with edgewise appliance (P<0.01). There was no statistical difference in other recorded PAR score between two groups. For the mean treatment duration, straight wire appliance (3.95 months) was shorter than edgewise appliance. Conclusion As for the posterior teeth alignment, the straight wire appliance was more accurate, and the straight wire appliance was more efficient than edgewise appliance.