热激活镍钛弓丝与普通镍钛丝在正畸治疗中的评价

背景:热激活镍钛弓丝是一种新型弓丝,有良好的记忆合金功能,不易形变,外环境温度的改变可能会对其性能产生影响.目的:对比观察热激活镍钛弓丝与普通镍钛丝临床应用效果的差异.方法:选择中山大学附属第一医院进行正畸治疗并且完成治疗的患者80例,随机将样本分为2组.普通组在排齐和整平阶段用普通镍钛丝,激活组在排齐和整平阶段使用热激活镍钛丝.并且匹配拔牙和非拔牙病例.观察两组的排齐时间,总疗程时间,弓丝断裂次数,托槽脱落次数,就诊次数.结果与结论:热激活组的病例在矫正时间,弓丝断裂次数与对照组比较,均差异有显著性意义(P<0.05),托槽脱落次数差异无显著性意义.使用热激活镍钛丝患者未发生过敏反应、毒性反应等不良反应.结果提示,热激活镍钛弓丝在正畸治疗过程中可以节省弓丝更换次数和减少弓丝断裂,缩短治疗时间.

Evaluation of heat-activated and common nickel-titanium wire for orthodontic treatment

BACKGROUND: Heat-activated nickel-titanium (HANT) wire is a new type of arch wire in orthodontic treatment, characterizing by well memory alloy ability and uneasily deformation. However, environmental temperature may affect its performance.OBJECTIVE: To compare the effects of HANT and common nickel-titanium wire in clinical application.METHODS: A total of 80 patients who have accepted and finished orthodontic treatment in the First Affiliated Hospital of Sun,Yat-sen University from July 2006 to November 2008 were randomly divided into two groups. The common group was treated with common arch wire in aligning and leveling stages, while the HANT group was treated using HANT in aligning and leveling stages. Tooth extracted cases were matched to non-tooth extracted cases. Indicators, such as time span for alignment, total treating time, times for wire breaking, times for bracket shedding, and times for return visits, were measured.RESULTS AND CONCLUSION: There was significant difference in treating time and times for wire breaking between the two groups (P < 0.05), but there was no significant difference in the times for bracket shedding. Anaphylactic response, toxic reaction,and other adverse reactions were not observed in the HANT group. Therefore, HANT wire can simplify orthodontic operation,shorten operation time beside the chair, save the total treating time, and reduce chances of shedding brackets and breaking wires.