| INHIBITORY EFFECT OF Er:YAG LASER ON THE GROWTH OF STREPTOCOCCUS MUTANS |
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| Er:YAG 레이저 조사가 Streptococcus mutans의 증식억제에 미치는 효과 |
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송광철, 이창섭, 이상호, 이난영 |
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조선대학교 치과대학 소아치과학교실 |
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| Abstract |
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The purpose of this study is to investigate the sterilization effect of Er:YAG laser against the intraoral acid producing bacterium, S. mutans, by irradiating the culture solution containing S. mutans KCTC 3065 with Er:YAG laser having a 650μm diameter beam through the non-contact method. We obtained the following results after examining the temperature changes of the culture solution, numbers of bacterial colonies, and acid-producing ability and attaching ability on teeth by measuring the amount of extracellular polysaccharide produced by S. mutans. The number of bacterial colony was decreased in 10μl culture solution irradiated with laser in overall compared to the control solution. The number decreased as the irradiation intensity and pulse repetition rate were larger and as the exposure time was increased. However, it did not change significantly in 100μl culture solution compared to the control solution. Although the acid-producing ability of S. mutans was inhibited for a certain duration after laser irradiation in 10r1 bacterial culture solution, it did not change in 100μm solution compared with the control solution. The amount of extracellular polysaccharide synthesized by S. mutans was partially decreased through laser irradiation in 10μm culture solution but did not change in 100μm culture solution. Based on these findings, we concluded that Er:YAG laser has an sterilization effect on S. mutans in which we presume that the mechanism is through the heat effect rather than the mechanical effect from development of ultrasound. |
| Key Words:
Er:YAG laser, Streptococcus mutans |
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