Journal of the Korean Academy of Pediatric Dentistry 2003;30(4):660-666.
Published online November 30, 2003.
INHIBITORY EFFECTS OF ER:YAG LASER ON THE GROWTH AND ACID PRODUCING ABILITY OF STREPTOCOCCUS MUTANS
1
2 
Er:YAG 레이저 조사가 S. mutans의 성장 및 산 생성능에 미치는 영향
김희진1, 국중기2, 이상호1, 이난영1
1조선대학교 치과대학 소아치과학 교실 및 구강생물학연구소
2조선대학교 치과대학 구강생화학교실 및 구강생물학연구소
Correspondence:  , 
Abstract
The purpose of this study was to investigate the inhibitory effect of Er:YAG laser against the intraoral acid producing bacterium of S. mutans. Bacterial pellet containing S. mutans KCTC 3065 was irradiated by Er:YAG laser having a 650μm diameter beam by non-contact mode. Irradiated parameters were 50mJ, 10Hz and exposure time were 1s, 3s, 5s, 7s, 9s respectively. We obtained the following results of relative growth rate and acid-producing ability of S. mutans by culturing for 48hrs. 1. The growth rate of S. mutans was decreased in the group of laser irradiation compared to the control group(P<0.01). 2. The growth rate at laser irradiation group of 7s, 9s irradiation time was decreased significantly compared to the laser irradiation group of 1s, 3s, 5s irradiation time, until 12 hours(P<0.05). After 24 hours, all groups of laser irradiation were not found to be statistically different in each other. 3. The acid-producing ability of S. mutans was inhibited for a certain duration by irradiation of laser. In summary, the growth rate and acid producing ability of S. mutans decreased according to laser irradiation. This effect was directly related to the amount of irradiation time. These results suggested that Er:YAG laser had an growth inhibition effect on S. mutans.
Key Words: Dental caries, S. mutans, Er:YAG laser


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