牙科高速手机细菌回吸量的体外实验研究

A Study on Bacterial Contamination of Dental Handpieces

目的 :研究不同细菌浓度、不同转动次数以及不同外表面消毒剂对手机细菌回吸量的影响。方法 :随机抽取新的牙科高速手机 2 0支 ,分别比较不同细菌浓度、不同转动次数和用不同外表面消毒剂消毒后 ,手机细菌回吸量的多少。结果 :随细菌浓度增大 ,手机细菌回吸量增多 ,不同浓度组间两两比较均有显著性差异 (P <0 0 5 ) ;在不同转动次数下手机细菌回吸量无显著性差异 (P >0 0 5 ) ;常用的消毒剂对手机外表面均能达到理想的消毒效果 ,但仅用外表面消毒不能减少手机内部的细菌回吸量。结论 :细菌浓度是影响手机内部回吸量的关键。

Objective: The aim of this study is to evaluate the effects of different factors, including concentration of the bacterial suspension, number of stops set on handpieces, and different disinfectants, on bacterial contamination of handpieces and their clinical significance. Methods: Bacterial contamination of 20 handpieces were analyzed in different concentration of bacterial suspension, number of stops set on handpieces and after using different out surface disinfectants. Results: Statistical increment (P<0 05) of handpieces inside contamination was observed relevant to increment of the bacterial suspension concentration. No statistical relevance was seen between handpiece inside contamination and the number of stops set on handpieces(P>0 05). Disinfection with different disinfectants significantly decreased out surface contamination(P<0 05), but no statistical change of bacteria (P>0 05) was observed inside handpieces. Conclusion:As the concentration of bacterial suspension is the key factor affecting the inside contamination of handpieces, oral cavity cleanness is essential before dental therapy. The surface disinfection of handpieces is necessary after dental therapy, but cannot prevent cross_contamination between patients.