口腔正畸矫正弓丝固定方法的研究与分析

A study of different archwire ligatioms in fixed appliance

目的探讨正畸矫正弓丝两种不同固定方法对托槽周围致龋菌的影响,并比较两种固定方法的临床工作效率。方法随机选择使用固定矫治器的44名患者,采用随机法在牙列一侧使用结扎丝固定弓丝,另一侧使用结扎圈固定弓丝,比较两者的椅旁操作时间。并对患者托槽周围的菌斑进行细菌厌氧培养,研究使用两种弓丝固定方法3个月后牙面变形链球菌附着情况的变化。结果用结扎丝的拆、扎上下半口弓丝的总时间平均为170.89 s,用结扎圈的拆、扎上下半口弓丝的总时间平均为121.46 s。经统计学分析,两者之间有显著性差异(P<0.001)。固定矫治器粘结后托槽周围牙面菌斑变形链球菌数量和在总菌中的百分比有显著增高,但使用结扎丝固定弓丝与使用结扎圈固定弓丝的牙面菌斑之间没有显著性差异。结论固定矫治器粘结后患者龋易感性增强。弓丝固定材料的选择并不会对相应牙面菌斑的致龋性产生直接的影响。用结扎圈进行弓丝结扎固定能够节省椅旁操作时间,提高工作效率。但结扎圈的使用不能完全替代结扎丝。

Objective： To study the influence of two different archwire ligations to the cariogenic microorganisms surrounding the bracket, and compare the clinical efficiency of them. Methods： 44 patients undergoing fixed appliance treatment were observed. Randomly in one side of the denture wire ligatures were used, and in the other side clastomeric tings were used.. Chairtimes of the two ligations were compared. After 3 months S. mutans and total anaerobic bacteria around brackets were cultured anaerobically. Results： The mean time of elastometric ligation was 121.46 seconds, which was much shorter than the time of 170.89 seconds with wire ligatures, and there was significant statistic difference （P 〈 0. 001 ）. There was an obvious increasing of the number and percentage of S. mutans three months later after bonding straight wire appliance. But there was no significant difference between using wire ligatures and using elastometric ligation. Conclusion： The caries - associated capability of plaque increased after bonding straight wire appliance. But different ligated mesns will not affect the caries - associated capability of plaque directly. Elastometric rings can reduce the chairtimes and improve the clinical efficiency, although it cannot substitute the wire ligatures completely.