Abstract: Objective To explore the effect of combined intervention on reducing the infective aerosols in the dental clinics, and to discuss the transmission risk of 2019-nCoV in dental clinics on the basis of it. Methods The General Department of Jiangsu Stomatology Hospital has developed a joint intervention strategy to control the infectious aerosol in the clinic since January 2018. The air samples were collected and detected at different time points and locations by plate sedimentation method. The levels of air bacterial colony in the dental clinics were monitored one month before and after the implementation of the combined intervention strategy. Results The number of air colonies in the consulting room was the highest 2 hours after oral treatment. The numbers of air colonies before and after combined intervention were (6.45±1.23) CFU/m3 and (1.31±0.42) CFU/m3, respectively, with statistical significance (P＜0.01). With the increase of sampling distance, the number of air colonies in the consulting room decreased significantly and the number of air colonies with different sampling distances before and after combined intervention was statistically significant (P＜0.01). Although the air quality of the clinic after combined intervention met the national standard, the number of colonies did not reach zero. 2019-nCoV is transmitted through respiratory droplets and contact, which has the risk of contaminating the air in the clinic and infecting the medical staff. Conclusion The combined intervention strategy can effectively reduce the production of infectious aerosols and the risk of cross infection in the dental clinics, which is worthy of promotion and application in the dental clinics.

Key words: combined intervention, dental clinic, infectious aerosol, Novel Coronavirus pneumonia