Comparison of reduction rate of bacterial contamination of dental office air during dental procedures using conventional suction –high vacuum suction-aerosol suction device – ozone water – retractor

Abstract

Introduction: Due to the type of dental treatment and the proximity of staff to patients, dental services can be a suitable environment for aerosol release. The use of aerosol reduction systems and methods is of great importance. The aim of this study was to investigate the reduction of bacterial contamination of dental office air during dental procedures by conventional suction methods , high vacuum suction ,aerosol suction device(fan) , ozone water. Method and material: In this experimental study, sampling was performed from a private dental office located in the city of Tabriz, which had the facilities and equipment of the research. The study in 8 groups included separate systems and a combination of water and high vacuum suction, fan, retractor and ozone. For each of the aerosol reduction methods, 3 patients with Class 2 restorative treatment were evaluated. Sampling was performed during the treatment of each patient in 6 points of the office at the same height as the patient's head. In each procedure, before treatment, the entire office was disinfected with UV light and patients rinsed their mouths with 1% betadine mouthwash. An ozone maker device was used to prepare the ozone water and added to the unit tank. Result: The effect of high vacuum suction was significantly greater at all distances than conventional suction in reducing aerosols (p \u003c.001). But on PC, two types of suction had similar function. Addition of retractor had no significant effect on colony reduction, but the effect was greater at long distances. Adding a fan to the \"suction\" high vacuum group and the \"suction + high vacuum +ozone\" group significantly reduced the colonies at all distances (p \u003c.001). The most important factor affecting the number of colonies was the addition of ozone to the unit water, which caused at intervals of 0.5 m (35.2%), 1.5 m (38.6%), 2 m (38%) and in pc (47.3%) had a significant decrease in cfu compared to high vacuum suction (p \u003c.001). The effect of ozone on reducing aerosols at longer distances (2 m and pc) is greater than close distances. Conclusion: The best way to reduce aerosols in the entire office space is the combined and simultaneous use of ventilation systems (high vacuum suction + ozone + fan).