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Effect of an aerosol- reduction device on spreading infected aerosols during ultrasonic scaling
P.  ghalyani Isfahani , Sa. Keyhan , A. Shirani ,
Volume 16, Issue 2 (5-2003)
Abstract

Statement of Problem: Ultrasonic Scaling is one of the main sources of producing infected aerosols in dentistry. These aerosols are able to spread pathogens such as microorganisms associated with tuberculosis, conjunctivitis, influenza and other respiratory diseases, herpetic and other skin diseases, ADIS and hepatitis B.
Purpose: The aim of this study was to investigate the clinical effectiveness of an aerosol- reduction device attaching to ultrasonic scaler handpiece.
Materials and Methods: In this experimental study 18 patients participated. Randomly, mandibular and maxillary quadrants of one side, in each subject, were scaled using an ultrasonic scaler with aerosol-reduction device for 5 minutes. After 30 minutes, another quadrant was scaled by ultrasonic scaler without aerosol- reduction device. In order to determine the effectiveness of aerosol- reduction device, blood agar plates attached to the surgical mask of the operator, 30 cm far from the patient's mouth, were incubated in 37°c for three days and the colonies were counted. Median, Interquartile eange and Wilcoxon test, at the 0.05 level of significance, were used to analyze the data.
Results: The median and interquartile range for the number of colony forming units (CFUS) without aerosol- reduction device was 17.5 (8, 24), while the median for the number of CFUS when using aerosol-reduction device was 0 (0, 1), indicating significant statistical difference (PO.001)

Conclusion: The aerosol- reduction device significantly reduces the amount of aerosols produced during ultrasonic scaling.


Detection of SARS-CoV-2 RNA in aerosols of clinical and non-clinical areas of a dental clinic during the post-pandemic period
Mogtaba Bayani, Hadiseh Mohammadi, Behzad Khonsarinejad, Dr. Seyed Hamed Mirhoseini,
Volume 39, Issue 0 (3-2026)
Abstract
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Background and Aims: The SARS-CoV-2 virus, capable of airborne transmission through aerosols, poses a significant challenge in clinical settings such as dental clinics. The use of high-speed instruments, including handpieces and ultrasonic scalers, generates considerable aerosols that, if contaminated, may facilitate infection transmission. This study aimed to detect the presence of the  SARS-CoV-2 virus in the clinical and non-clinical areas of a dental clinic.

Materials and Methods: In this cross-sectional study, 20 air samples were collected from various sections of the Dental School of Arak University of Medical Sciences. Sampling was performed using a pump equipped with a filter for two hours at a flow rate of 5 L/min and a height of 1.5 m above the floor. The samples were transported under a cold chain, the viral RNA was extracted, and then were analyzed using a specific RT-PCR kit.

Results: Out of 20 collected air samples, 3 samples (15%) tested positive for SARS-CoV-2 RNA. Two from clinical departments (restorative and fixed prosthodontics) and one from a non-clinical area
(pre-clinic).

Conclusion: The findings of this study indicated that SARS-CoV-2 RNA was detectable in some air samples from both clinical and non-clinical areas of the dental clinic. These results highlight the importance of strict adherence to infection control protocols across all sections of dental clinics to minimize the risk of airborne transmission.


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