牙科高速手机辅助微创拔牙的冷却水选择初探

A preliminary investigation on the selection of cooling water in minimally invasive exodontia assisted by high-speed dental handpiece

目的通过对临床常用的消毒牙科综合治疗台水路系统方法:次氯酸钠法消毒效果的评价,初步探讨牙科高速手机辅助微创拔牙的冷却水选择。方法随机选择10台独立水源口腔综合治疗台,分别采集其水路经700 mg/L次氯酸钠消毒后接诊患者前(8∶00)、中午下班前(11∶30)和下午下班前(17∶30)3个时间点高速手机出水口水样,检测并计算总菌落数。所得数据利用SPSS 19.0统计软件进行广义估计方程进行分析。结果不同时间点水样微生物总菌落数不同。未接诊病人时,水样中未检测出细菌。下午时间点细菌数量最多,中午时间点细菌数量次之。广义估计方程分析结果显示不同测量时间点上的微生物菌落数的差异具有统计学意义(P<0.05)。结论次氯酸钠消毒剂对口腔综合治疗台水路具有良好消毒效果,但随着时间的推移在综合治疗台使用过程中,水路系统会遭到污染,达不到拔牙手术无菌要求,需要选择其他方式的手机冷却水系统。

Objective To investigate the selection of cooling water in minimally invasive exodontia using high speed handpiece by evaluating the effect of sodium hypochlorite disinfection method which is a common approach to sterilize dental unit waterlines（ DUWLs）. Methods Ten dental units were randomly selected. Water samples were taken from their water outlets of high-speed handpiece at three different time points： 8∶ 00（ the time after sterilization with 700 mg / L sodium hypochlorite and before receiving patients）,11∶ 30（ the time right after semi-day＇s therapy） and 17∶ 30（ the time right before the end of the daily clinical work）,respectively. Then,Colony-Forming Units（ CFU） were counted. The data were analyzed by generalized estimating equation with SPSS 19. 0 software. Results The CFUs of water samples at different time points were significantly（ P〈0.05）. No microorganisms were detected in samples of 8 ∶ 00. Microorganisms were detected in samples of 11∶ 30 and 17∶ 30,and the CFUs observed in samples of the latter were more than those of the former. Conclusions Sodium hypochlorite has a good effect on DUWLs infection control. However,during the use of the dental unit,the waterlines can be contaminated,which does not cater for the requirements of exodontia which should be an aseptic operation. Therefore,it is necessary to apply other cooling water system for high- speed handpieces to cooling water systems in minimally invasive exodontia.