Evaluation of bactericidal effects of ultraviolet light C irradiation on cariogenic bacteria: An in vitro study

BMC Oral Health

Fahad Bakitian¹  Moayyad Alharbi²  Ali Alenezi³ 

[1] Department of Conservative Dentistry, College of Dentistry, Umm Al-Qura University, Makkah, Saudi Arabia;Department of Preventive Dentistry, Ministry of Health, Tabuk, Saudi Arabia;Department of Prosthodontics, College of Dentistry, Qassim University, Buraydah, Saudi Arabia;

关键词: Ultraviolet light C;    Dental caries;    Streptococcus mutans;    Bactericidal effect;   

DOI  :  10.1186/s12903-021-01767-x

来源: Springer

【 摘 要 】

BackgroundsUltraviolet light C (UVL-C) irradiation has demonstrated an antimicrobial action against various pathogens. This study aimed to evaluate the bactericidal effect of UVL-C irradiation against cariogenic oral bacteria (Streptococcus mutans) in single layers and colonies grown on solid surfaces.MethodsTwo different experiments were performed. In the first experiment, a single layer of Streptococcus mutans bacteria on agar plates was exposed to UVL-C irradiation at energies from 0 to 21 mWs/cm2. The second experiment was conducted to inhibit viability of bacterial colonies on solid surfaces. The samples were derived from saliva from a patient where bacteria were grown on plastic strips and then exposed to UVL-C. The highest energy was 1050 mWs/cm2.ResultsExposure to 21 mWs/cm2 was bactericidal in single layers of Streptococcus mutans. The result for bacterial colonies on solid surfaces indicated only a bacteriostatic effect, even at energies of 1050 mWs/cm2.ConclusionsUltraviolet light C exhibits bactericidal effects on single layers of Streptococcus mutans but has a limited effect on bacterial colonies in a biofilm. It is a matter of debate whether these in vitro results would have the same effect in clinical setting.

【 授权许可】

CC BY