摘要
目的 :评价Nd :YAG激光对三种细菌的杀菌效果。方法 :用剂量分别为 10 0mJ、2 5Hz、2 5W、140mJ、2 5Hz、3 5W及 16 0mJ、2 5Hz、4 0W的脉冲Nd :YAG激光对三种细菌悬液照射 4min后 ,计算其杀菌率。结果 :从低剂量到高剂量 ,激光对各菌种的杀菌率依次为绿脓杆菌 47 0 7%、86 74%和 10 0 % ;金黄色葡萄球菌为 2 5 6 9%、6 0 90 %和 10 0 % ;大肠埃希氏杆菌为14 81%、33 6 8%和 85 0 6 %。结论 :脉冲Nd :YAG激光对三种细菌的杀菌作用随激光剂量的增加而增强。不同细菌对激光照射的耐受性不同。
Objective:To detemine the bactericidal effects of the pulsed Nd:YAG laser on three species bacterial strains in vitro Cell suspensions of each strain were exposed to three laser energy groups of 100mJ,25Hz,2.5W;140mJ,25Hz,3.5W and 160mJ,25Hz,4.0W.Then the colonies were counted and the bactericidal rates were measured.Results:From low to high dosages,the bactericidal rates of Pseudomonas aeruginosa were respectively 47 07%,86 74% and 100%,Staphylococcus aureus were 25 69%,60 90% and 100%,Escherichia coli were 14 81%,33 68% and 85 06% under three laser parameters.Conclusion:These findings suggest that higher energy levels increased the bactericidal effects of the Nd:YAG laser.The relative resistance to laser radiation was different with each of the bacteria.We discussed the possibility of the laser in improving the clinical treatment of periodontitis.
出处
《口腔医学》
CAS
北大核心
2000年第1期16-17,共2页
Stomatology
基金
广东省自然科学基金资助项目!编号 :940 845
