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A STUDY ON THE EFFECT OF THE ND:YAG LASER IRRADIATION ON THE MECHANICALLY EXPOSED PULP

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Abstract

ÀÌ ¿¬±¸´Â ±â°èÀûÀ¸·Î ³ëÃâµÈ ¼º°ßÀÇ Ä¡¼ö¿¡¼­ Ä¡¼ö³» ¿°Áõ¼º º¯È­¿Í »ó¾ÆÁú±³ÀÇ Çü¼º°ú ÀÜÁ¸ »ýÈ°Ä¡¼öÀÇ ¼¶À¯¸ð¼¼Æ÷ÀÇ ±¸Á¶Àû º¯È­¸¦ Æ÷ÇÔÇÏ´Â Ä¡À¯°úÁ¤¿¡¼­ÀÇ Nd:YAG laserÀÇ È¿°ú¸¦ Æò°¡ÇÏ¿´´Ù.
½ÇÇè 1±ºÀº ·¹ÀÌÀú·Î 3W, 30Hz, 0.2sec Á¶»çÁ¶°ÇÀ¸·Î ±¤¼¶À¯¸¦ Ä¡¼ö¿¡ Á÷Á¢ Á¢Ã˽ÃÄÑ 2~3Ãʵ¿¾È Á¶»çÇÏ¿´´Ù. ½ÇÇè 2±ºÀº ³ëÃâµÈ Ä¡¼ö¸¦ ·¹ÀÌÀú·Î µ¿ÀÏÇÑ Á¶°ÇÀ¸·Î 2~3ÃÊ µ¿¾È Ä¡¼ö¿¡ Á¢ÃËÇÏ¿© Á¶»çÇÑ ÈÄ ¼ö»êÈ­Ä®½· ºÐ¸»À» µµÆ÷ ÇÏ¿´´Ù. Ç¥º»Àº 3, 7, 14, 30ÀÏ¿¡ ±¤ÇÐ Çö¹Ì°æ°ú ÀüÀÚ Çö¹Ì°æÀ¸·Î °üÂûÇÑ ¹Ù, ´ÙÀ½°ú °°Àº °á·ÐÀ» ¾ò¾ú´Ù.
1. Ä¡¼öÀÇ ¿°Áõ¾ç»óÀº ´ëÁ¶±º, Á¦ 2±º°ú Á¦ 3±ºÀÌ Á¦ 1±º¿¡ ºñÇØ °¨¼ÒÇÏ¿´À¸¸ç Á¦ 2±º°ú Á¦ 3±ºÀº ¿°ÁõÀÇ Á¤µµ°¡ ºñ½ÁÇϳª Á¦ 3±º¿¡¼­ Ä¡¼öÀÇ ´õ ±íÀº ºÎÀ§±îÁö ¿°ÁõÀÌ °üÂûµÇ¾ú´Ù.
2. Á¦ 2±º°ú Á¦ 3±ºÀÌ ´ëÁ¶±º¿¡ ºñÇØ 14ÀÏ, 30ÀÏ Ç¥º»¿¡¼­ »ó¾ÆÁú±³ÀÇ Çü¼ºÀÌ Àü¹ÝÀûÀ¸·Î ±ÕÀÏÇÏ°Ô ³ªÅ¸³µÀ¸¸ç Á¶»ó¾Æ¼¼Æ÷ÀÇ ¹è¿­»óŵµ ´õ ±ÕÀÏÇÏ°Ô ³ªÅ¸³µ´Ù.
3. ·¹ÀÌÀú¸¸À» Á¶»çÇÑ ½ÇÇè 2±ºÀº ½Ã¼ú 3ÀÏ, 7ÀÏ°¿¡ Ä¡¼öÀÇ ÃµºÎ¿¡ Á¶Á÷ÀÇ ±«»ç ¹× ºó °ø°£ÀÌ ¸¹ÀÌ °üÂûµÇ¾úÀ¸¸ç ¼¼Æ÷¸·ÀÇ ¼Ò½Ç, ¼¼Æ÷ÀÇ °øÆ÷È­ µî ¼¼Æ÷ÀÇ º¯ÇüÀÌ °üÂûµÊÀ¸·Î½á ´Ù¸¥ ±º¿¡ ºñÇØ Á¶Á÷ÀÇ ¼Õ»óÀÌ ´õ ¸¹Àº °ÍÀ¸·Î ³ªÅ¸³µ´Ù.
4. ·¹ÀÌÀúÁ¶»ç¿Í ¼ö»êÈ­Ä®½·À» µµÆ÷ÇÑ Á¦ 2±º°ú Á¦ 3±ºÀº ´ëÁ¶±º°ú Á¦ 1±º¿¡ ºñÇØ ¼¶À¯¾Æ¼¼Æ÷ÀÇ È°¼ºµµ°¡ Áõ°¡µÊÀ¸·Î½á Á¶Á÷ÀÇ Ä¡À¯°¡ »ó´ëÀûÀ¸·Î ºü¸¥ °ÍÀ¸·Î ³ªÅ¸³µ´Ù.
The purpose of this study was to investigate the effects of Nd:YAG laser on mechanically exposed pulp of dog by the observation of pulpal inflammatory change and heal process including dentinal bridge, structural changes of fibroblasts of thr remaining vital pulp tissue.
In experimental group 1, the exposed pulps were irradiated with Nd:YAG laser(3W, 30Hz, 0.2sec) for 2?3 second followed by capped with aluminium tin foil. In group 2 and group 3, the exposed pulps were irradiated with Nd:YAG laser via contact(Group 2) and non-contact(Group 3) methods followed by capped with calciumhydroxide paste.
The animal were sacrificed at the intervals of 3. 7, 14 and 30days for histologic evaluation.
The results were as follows
1. The dentinal bridges were formwd more fast and broadly in the experimental group 1 and 2 than other groups, but there were no histologic differences in the degree of their formation among control group, experimental group 1.
2. Odontoblastic activities at amputated pulp was increased in the experimental group 2, 3 than other group but there no histologic difference in the odontblastic activitiy among control group, experimental group I.
3. The infalmmation was severe at the postoperative 1 week of all groups, but its condition subsideed with time elapsed. At the postoperative 3, 7 days, its condition in experimental group 2, 3 were less severe than in the group I.
4. There were no histologic differences between the experimental group 2 and 3 according to the degree of dentin bridge formation.

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Nd:YAG ·¹ÀÌÀú;¼ö»êÈ­Ä®½·;»ó¾ÆÁú±³;Nd:YAG Laser;Calcium hydoxide;Dentinal bridge

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