Disinfection effect of photocatalyst air sterilizer on dental clinic air under different humidity conditions

[Objective]To observe the dynamic disinfection effect of photocatalyst air sterilizer on dental clinic air under different humidity conditions.[Methods]Under the condition of normal temperature,there were two groups according to the indoor humidity: Group A( humidity less than 60%) and Group B( humidity greater than 60%). By using the ordinary agar plate exposure method,the photocatalyst air sterilizer worked under the conditions of no medical activities day( the static environment) and normal working day( the dynamic environment) respectively. The air bacteria sampling was conducted during different periods,to compare the total bacteria count in two groups.[Results]When the photocatalyst air sterilizer run for 30 minutes in the static environment,the sterilization rate of Group A( 80. 65%) was higher than that of Group B( 60. 57%) significantly( P 0. 01). When the photocatalyst air sterilizer run for 60 minutes,the sterilization rate of Group A and Group B was 89. 27% and 88. 95% respectively,and the difference was not significant. In the dynamic environment,when disinfection lasted for 30 minutes,the difference in total bacteria count between two groups was not significant. When disinfection lasted for 60,120 and 180 minutes,the total bacteria counts of Group A were significantly lower than those of Group B.[Conclusion]The humidity condition may affect the disinfection effect of photocatalyst air sterilizer. When indoor humidity is less than 60%,the disinfection effect is rapid in the static environment,while the disinfection effect can be maintained for? longer period in the dynamic environment.