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INHIBITORY EFFECTS OF ER:YAG LASER ON THE GROWTH AND ACID PRODUCING ABILITY OF STREPTOCOCCUS MUTANS

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Abstract

Ä¡¾Æ¿ì½ÄÁõÀº »ê¿¡ ÀÇÇØ ¹ý¶ûÁúÀÌ Å»È¸µÇ´Â Çö»óÀ¸·Î ¼Ò¾Æ ¹× û¼Ò³â±â¿¡ °¡ÀåÈçÈ÷ ¹ß»ýÇÏ´Â ±¸°­Áúȯ ÁßÀÇ Çϳª·Î¼­,Ä¡¾Æ¿ì½ÄÁõÀÇ ¿øÀοä¼Ò Áß ´Ù¸¥ ÀÎÀڵ麸´Ù °´°üÀûÀ¸·Î Á¶»çÇÒ ¼ö ÀÖ´Â ±¸°­³» ¼¼±Õ¿¡ ´ëÇÑ ¿¬±¸°¡ È°¹ßÈ÷ ÀÌ·ç¾îÁ® ¿Ô´Ù. ÀÌ ¿¬±¸´Â ±¸°­³»ÀÇ Ä¡Å¶ó´Â °íü»óÅÂÀÇ Á¶°Ç°ú À¯»çÇÑ »óÅ·ΠEr:YAG ·¹ÀÌÀú°¡ ±¸°­³» »ê »ý¼º¼¼±ÕÀÎ S. mutansÀÇ Áõ½Ä¿¡ ¹ÌÄ¡´Â ¿µÇâ ¹× ·¹ÀÌÀúÀÇ Á¶»ç½Ã°£¿¡ µû¸¥ Â÷À̸¦ Æò°¡ÇÏ°íÀÚ ÇÏ¿´´Ù.
Er:YAG ·¹ÀÌÀúÀÇ ±¸°­³» »ê »ý¼º ¼¼±ÕÀÎ S. mutans¿¡ ´ëÇÑ Áõ½Ä¾ïÁ¦È¿°ú¸¦ Æò°¡Çϱâ À§ÇÏ¿© S. mutans pellet¿¡ Er:YAG ·¹ÀÌÀú¸¦ ºñÁ¢ÃË½Ä ¹æ¹ýÀ¸·Î, 50mJ, 10Hz, ±×¸®°í Á¶»ç½Ã°£À» 1ÃÊ, 3ÃÊ, 5ÃÊ, 7ÃÊ, 9ÃÊ·Î ´Þ¸®ÇÏ¿© Á¶»çÇÏ°í À̶§ÀÇ ¼¼±ÕÀÇ ¼ºÀå·ü°ú »ê »ý¼º´ÉÀ» 0, 2, 4, 8, 12, 24, 36, 48½Ã°£ µ¿¾È ÃøÁ¤ÇÑ °á°ú ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù.
1. ·¹ÀÌÀú¸¦ Á¶»çÇÑ ±ºÀÌ ·¹ÀÌÀú¸¦ Á¶»çÇÏÁö ¾ÊÀº ´ëÁ¶±º¿¡ ºñÇØ ¼¼±ÕÀÇ ¼ºÀå·üÀÌ °¨¼ÒµÇ¾ú´Ù(P<0.01).
2. ·¹ÀÌÀú¸¦ Á¶»çÇÑ ÈÄ 12½Ã°£±îÁö 1, 3, 5ÃÊ Á¶»ç±º¿¡ ºñÇØ 7, 9ÃÊ Á¶»ç±º¿¡¼­ ¼¼±ÕÀÇ ¼ºÀåÀ²ÀÌ À¯ÀÇÇÏ°Ô °¨¼ÒµÇ¾úÀ¸³ª (P<0.05), 24½Ã°£ ÈĺÎÅÍ´Â ¼­·Î À¯ÀÇÇÒ¸¸ÇÑ Â÷À̸¦ º¸ÀÌÁö ¾Ê¾Ò´Ù.
3. ·¹ÀÌÀú¸¦ Á¶»çÇÑ ½Ã°£ÀÌ Áõ°¡ÇÔ¿¡ µû¶ó ¼¼±ÕÀÇ »ê »ý¼º´É·ÂÀÌ È¸º¹µÇ´Â ½Ã°£ÀÌ ±æ¾îÁüÀÌ °üÂûµÇ¾ú°í 24½Ã°£ ÈÄ¿¡´Â ´ëÁ¶±º°ú Â÷À̸¦ º¸ÀÌÁö ¾ÊÀ½À¸·Î½á ÀÏÁ¤ ½Ã°£ ÀÌÈÄ¿¡´Â Á¡Â÷ÀûÀ¸·Î »ê »ý¼º´É·ÂÀÌ È¸º¹µÊÀ» ¾Ë ¼ö ÀÖ¾ú´Ù.

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 650 ¥ìm diameter beam by non-contact mode. Irradiated parameters were 50mJ, 10Hz and expo¡þsure time were is, 3s, 5s, 7s, 9s respectively. We obtained the following results of relative growth rate and acid¡þproducing 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 is, 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.

Å°¿öµå

Ä¡¾Æ¿ì½ÄÁõ;S. mutans;Er:YAG laser;Dental caries

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