两种正畸粘接剂托槽生存率的比较研究

Comparison of Bracket Survival Rate between a Self-etching and a Two-step Etch and Primer Adhesive System

目的:比较自酸蚀粘接剂和全酸蚀粘接剂粘接托槽的临床效果。方法:选择42名固定正畸患者,采用自身对照研究,分别使用一步法自酸蚀粘接剂和两步法全酸蚀粘接剂粘接726个托槽,计算12个月内托槽的脱落率,卡方检验比较4种因素(粘接剂、牙弓、牙位和性别)对托槽脱落率的影响;Kaplan-Meier法绘制托槽生存率曲线,log-rank检验分析上述4种因素对托槽生存率的影响,同时评价牙釉质表面的剩余粘接剂指数。结果:两种粘接剂的托槽脱落率无统计学差异;生存分析表明粘接剂类型和牙弓位置对托槽生存率的影响无统计学差异,但前磨牙托槽的生存率比切牙和尖牙低,女性患者的托槽生存率高于男性;自酸蚀粘接剂的剩余粘接剂指数与全酸蚀粘接剂无统计学差异。结论:自酸蚀粘接剂与两步法全酸蚀粘接剂都具有较高的托槽生存率,均能满足正畸临床粘接的要求。

Objective： To compare the survival rate of orthodontic brackets over a 12--month period between a self -- etching primer bonding system and a two-- step etch and primer adhesive. Methods ： In forty-- two patients, seven hundred and six--two brackets were bonded by one operator with a split--mouth design, using either a self--etch- ing primer or two--step etch and primer adhesive system. Bracket failure rates were estimated with respect to bond- ing procedure, dental arch, type of tooth, and gender. The results were evaluated using the chi--square test. The survival rate of the brackets was estimated by Kaplan--Meier analysis. Bracket survival distributions with respect to bonding procedure, dental arch, type of tooth, and patient gender were compared using the log--rank test. Results： The failure and survival rates did not show significant differences between thebonding procedures or upper and low er dental arches. Lower survival rates were found for premolar teeth than incisors and canine. Bond failure rates were lower for females than males. Conclusion： The self--etching primer adhesive can he effectively used for bond ing of orthodontic brackets and can serve as a practicable alternative to the two--step etch and primer adhesive.