压力蒸汽灭菌对牙科手机使用性能的影响

Effects on performance of high-speed dental handpieces subjected to autoclaving

目的探讨压力蒸汽灭菌对牙科手机使用性能影响。方法压力蒸汽灭菌效果试验方法,设1种温度、1个时间段为一试验组,每一试验组取化学指示卡10个、生物指示菌片10片进行试验,灭菌温度范围是100-134℃,灭菌时间范围是1-45 min,根据压力蒸汽灭菌对嗜热脂肪杆菌芽胞的杀灭效果、化学指示卡检测结果论证压力蒸汽灭菌的可靠性;采用国产、进口2种品牌新牙科手机各10把进行试验,根据不同压力蒸汽灭菌器灭菌处理牙科手机后出现的性能变化,探讨压力蒸汽灭菌对牙科手机使用性能的影响。结果经对221支经压力蒸汽灭菌处理后牙科手机无菌检测均达到合格标准的结果证明,压力蒸汽灭菌牙科手机的灭菌效果可靠;根据化学指示卡灭菌效果指示,在121℃条件下包内达到灭菌要求需要20 min、包外达到灭菌要求仅需要15 min,在134℃条件下包内达到灭菌要求需要4 min、包外达到灭菌要求仅需要2 min,证明物品包装后灭菌较裸露灭菌所需时间长;压力蒸汽灭菌对牙科手机使用性能有影响,快速压力蒸汽灭菌器灭菌牙科手机,对牙科手机的使用性能影响较小,在一定的灭菌循环次数范围内,灭菌全过程为6 min的快速压力蒸汽灭菌器对牙科手机的使用性能影响是可复的。结论压力蒸汽灭菌效果可靠;为了减少压力蒸汽灭菌对牙科手机使用性能的影响,对牙科手机可不进行包装灭菌,应使用快速压力蒸汽灭菌器灭菌牙科手机。

Objective To investigate the effects on performances of high-speed dental handpieces subjected to autocalving. Methods The method of trial used to evaluate the effect of autoclaving included that ten chemical and ten biological indicators were arranged in each trial group being set by one sort of temperature and sterilization time. The range of temperature was from 100 ℃ to 134 ℃ and the sterilization time was from 1 to 45 minutes. The reliability of autoclaving was evaluated by the result of chemical indicator and the endospores of Bacillus stearothermophilus subjected to autoclaving. Ten newly imported and ten new domestic dental handpieces in two different brands were used to carry out this trial. The effects produced by autoclaving on performances of dental handpieces subjected to different type autoclaves were evaluated by some parameters. Results The eligible outcome in killing test of the 221 sterilized dental handpieces proved that the sterilization effect of autoclaving on deantal handpieces was reliable. The chemical indicators showed that under the condition of 121 ℃ it needed 20 minutes to reach sterilization standard in the inner package and only 15 minutes on the outer package, and under the condition of 134 ℃ it took 4 minutes to reach sterilization standard in the inner package while only 2 minutes on the outer package. This outcome proved that material with package was more time-consuming than that without package during autoclaving. Autoclaving has positive effects on the performance of dental handpieces, while the autoclave with less-time full sterilization cycle has less effect on it. The performance of dental handpieces sterilized by the autoclave with 6-minute full sterilization cycle might be restorable within certain times of sterilization cycle. Conclusion The sterilization effect of autoclaving is reliable. In order to reduce the influence on the performance of dental handpieces subjected to autoclaving, it should be reasonable to use the autoclave by which a full sterilization cycle might take less time and no use of package.