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Failure of non-vacuum steam sterilization processes for dental handpieces

机译:用于牙科手机的非真空蒸汽灭菌方法的失效

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Summary Background Dental handpieces are used in critical and semi-critical operative interventions. Although some dental professional bodies recommend that dental handpieces are sterilized between patient use there is a lack of clarity and understanding of the effectiveness of different steam sterilization processes. The internal mechanisms of dental handpieces contain narrow lumens (0.8–2.3 mm) which can impede the removal of air and ingress of saturated steam required to achieve sterilization conditions. Aim To identify the extent of sterilization failure in dental handpieces using a non-vacuum process. Methods In-vitro and in-vivo investigations were conducted on widely used UK bench-top steam sterilizers and three different types of dental handpieces. The sterilization process was monitored inside the lumens of dental handpieces using thermometric (TM; dataloggers), chemical indicator (CI), and biological indicator (BI) methods. Findings All three methods of assessing achievement of sterility within dental handpieces that had been exposed to non-vacuum sterilization conditions demonstrated a significant number of failures [CI: 8/3024 (fails/no. of tests); BI: 15/3024; TM: 56/56] compared to vacuum sterilization conditions (CI: 2/1944; BI: 0/1944; TM: 0/36). The dental handpiece most likely to fail sterilization in the non-vacuum process was the surgical handpiece. Non-vacuum sterilizers located in general dental practice had a higher rate of sterilization failure (CI: 25/1620; BI: 32/1620; TM: 56/56) with no failures in vacuum process. Conclusion Non-vacuum downward/gravity displacement, type N steam sterilizers are an unreliable method for sterilization of dental handpieces in general dental practice. The handpiece most likely to fail sterilization is the type most frequently used for surgical interventions.
机译:摘要背景技术牙科手机用于批判性和半关键的操作干预措施。虽然一些牙科专业机构建议牙科手机在患者使用之间消毒,但缺乏清晰度和了解不同蒸汽灭菌过程的有效性。牙科手机的内部机制含有窄的流明(0.8-2.3mm),其可以妨碍去除空气和饱和蒸汽的进入,以实现灭菌条件。旨在使用非真空过程确定牙科手机中灭菌失效程度。对体外和体内研究的方法是广泛使用的英国台式蒸汽灭菌器和三种不同类型的牙科手机进行的。使用温度计(TM; DIALOGGERS),化学指标(CI)和生物指标(BI)方法在牙科手持内部监测灭菌过程。调查结果,在暴露于非真空灭菌条件的牙科手机内评估无菌在牙科手机内的所有三种方法表现出大量的故障[CI:8/3024(试验/无效。测试); BI:15/3024; TM:56/56]与真空灭菌条件相比(CI:2/1944; BI:0/1944; TM:0/36)。牙科手机最有可能在非真空过程中灭菌的灭菌是手术手动。在一般牙科实践中的非真空灭菌器具有更高的灭菌失败率(CI:25/1620; BI:32/1620; TM:56/56),真空过程中没有故障。结论非真空向下/重力位移,N型蒸汽灭菌器是一种不可靠的方法,用于一般牙科实践中的牙科手机灭菌。最有可能失效灭菌的手机是最常用于外科干预的类型。

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