Disinfection effects of ultraviolet irradiation combined with ozone fumigation method on intraoral scanner camera

JIANG Yong; DU Jiao-hui; XIAO Yan; TAN Min-juan; TIAN Yu; WANG Sheng-chao; ZHANG Ya-qing; FAN Xiao-min

doi:10.15956/j.cnki.chin.j.conserv.dent.2025.01.002

Abstract：AIM:To study the in vitro antibacterial effect of ultraviolet irradiation combined with Ozone fumigation method and its disinfection effects on intraoral scanner cameras.METHODS:In the in vitro study,different concentrations of Escherichia coli,Staphylococcus aureus,Candida albicans and Streptococcus mutans were inoculated on Petri dishes and exposed to ultraviolet irradiation combined with ozone fumigation for 30 s,1 min,2 min,3 min and 5 min respectively.The antibacterial effects were then compared.According to the results of last step,the clinical study were divided into 3 groups.After taking intraoral images of the volunteers,the camera were disinfected by 75％alcohol wiping only(control group),75％alcohol wiping combined with soaking ortho-phthalaldehyde solution for 12 min(experimental group 1),or 75％alcohol wiping combined with ultraviolet irradiation and Ozone fumigation simultaneously for 5 min(experimental group 2)respectively.The effective rates of the three disinfection methods were compared by bacterial culture.RESULTS:In the in vitro study,the growth of almost all the four bacteria colonies was inhibited by 5 minute's ultraviolet irradiation combined with Ozone fumigation.In the clinical study,for aerobic bacteria,the effective rates of disinfection in experimental group 1(100％)and experimental group 2(100％)were significantly higher than that in the control group(88.3％)(P＜0.05).For anaerobic bacteria,the effective rates of disinfection in experimental group 1(100％)and experimental group 2(100％)were significantly higher than that in control group(88.3％)(P＜0.05).CONCLUSION:The disinfection effect of 75％alcohol combined with ultraviolet irradiation and Ozone fumigation simutaniously on intraoral scanner is similar to that of 75％alcohol combined with o-phthalaldehyde soaking,but the former has shorter disinfection time which is worth to be promoted in clinic.