1Pedodontic and Preventive Dentistry Department, Collage of Dentistry, University of Baghdad, Iraq
*Corresponding Author: Khamaal IM. Al-Hasnawi, Pedodontic and Preventive Dentistry Department, Collage of Dentistry, University of Baghdad, Iraq, Email: d.khamaal1977@gmail.com
Online published on 23 December, 2019.
Laser has an antibacterial action on dentine and enamel through the vaporization of cariogenic bacteria(Streptococcus mutans and Lactobacilli). many investigations related to the application of Neodymium doped yttrium-aluminium-garnet (Nd: YAG) laser in preventive dentistry have been proposed as caries prevention therapies.
The aim of the study was to investigate the antibacterial effect of Nd-YAG laser on the viable counts of salivary mutans streptococci and lactobacilli.
Standardized suspensions of bacterial growth of Streptococcus Mutans and Lactobacilli that each one were inoculated in seven sterile screw capped bottles, one of them was control and the other six were the study bottles (study groups) exposed to Nd-YAG laser beam at different powers and different exposure times.
The results of Streptococcus mutans and Lactobacilli, which exposed to Nd-YAG laser, showed a heavy bacterial growth in the control group, but after radiation, there was a reduction in the mean values of CFU/ml for Streptococcus Mutans, while heavy reduction in the mean values of CFU/ml for Lactobacilli, with the maximum reduction was in the group that was exposed to (80mj for 30s) for two bacteria.
The Nd-YAG laser was represented antibacterial effect on Lactobacilli with minimal exposure time and energy, while less effect on Streptococcus mutans with maximum energy and exposure time.
NdYAG laser, Streptococcus mutans, Lactobacilli
