不同清洗方法对牙科手机灭菌效果及损耗情况的影响

目的比较全自动热清洗机清洗法和全自动清洗注油养护机清洗法对牙科手机灭菌效果及损耗情况的影响。方法将全新的NSK牙科手机80支根据随机数字表法分为A、B两组各40例，A组采用全自动热清洗机清洗，B组采用全自动清洗注油养护机清洗，每支牙科手机反复清洗、注油、灭菌、使用200次，记录损耗的情况；每组随意抽取18支进行无菌检测。结果80支牙科手机在实验过程中，有20支出现故障，其中11支经维修后继续使用，A组有9支，B组有2支，两组比较差异有统计学意义（X2=5．165，P〈0．05）。无菌检测A组18支手机均无细菌生长，B组18支手机中有1支真菌阳性，两组比较差异无统计学意义（X2=1．029，P〉0．05）。结论两种清洗方法对牙科手机灭菌效果的影响无差异，全自动热清洗机清洗法因内部无法完全干燥增加了牙科手机缺油现象的发生，全自动清洗注油养护机清洗法是一种对牙科手机损耗小的清洗方法。

Effect of two cleaning methods on the sterilizing efficacy and dental handpiece wear

Objective To compare the sterilizing efficacy and dental handpiece wear of automatic hot cleaner and automatic cleaning-oiling maintainer cleaning methods. Methods Eighty new NSK handpieces were randomly divided into two groups, with 40 cases for each group. Group A were cleaned by hot cleaner and group B were cleaned by automatic cleaning-oiling maintainer. Each handpiece was cleaned, oiled, sterilized and used in the clinic for 200 times. The handpiece wear situation was recorded and eathl8 handpieces from two groups were randomly taken to Beijing Centers for Diseases Control and prevention for sterilization inspection. Results During the experiment, 20 of the 80 handpieces went out of order and 11 of them were reused after maintenance, among which nine were from group A and two were from group B. The difference between two groups were statistically significant（ X2 = 1. 029, P 〈0. 05 ）. No bacteria was detected in 18 handpieces in group A, while one of the eighteen handpieces in group B was contaminated with fungus. There was no statistically significant difference between the two groups （ X2 = 5. 165, P 〉 0. 05 ）. Conclusions There was no significant difference in the sterilizing efficacy between two cleaning methods. The cleaning method of automatic hot cleaner can increase the incidence of insufficient oiling for its incomplete internal desiccation. Therefore, cleaning-oiling maintainer is a low-wear cleaning method to dental handpiece cleaning.