Àá½Ã¸¸ ±â´Ù·Á ÁÖ¼¼¿ä. ·ÎµùÁßÀÔ´Ï´Ù.

Er:YAG ·¹ÀÌÀúÀÇ »ó¾ÆÁú »èÁ¦È¿°ú ¹× ÀÌ¿¡ µû¸¥ ¿Âµµº¯È­

ANALYSIS OF ER:YAG LASER IRRADIATION ON CUTTING EFFICACY AND TEMPERATURE CHANGES OF DENTIN

´ëÇѼҾÆÄ¡°úÇÐȸÁö 2001³â 28±Ç 1È£ p.32 ~ 44
ÀÓ±¤È£, ÀÌâ¼·, ÀÌ»óÈ£,
¼Ò¼Ó »ó¼¼Á¤º¸
ÀÓ±¤È£ ( Im Kwang-Ho ) - Á¶¼±´ëÇб³ Ä¡°ú´ëÇÐ ¼Ò¾ÆÄ¡°úÇб³½Ç
ÀÌâ¼· ( Lee Chang-Seep ) - Á¶¼±´ëÇб³ Ä¡°ú´ëÇÐ ¼Ò¾ÆÄ¡°úÇб³½Ç
ÀÌ»óÈ£ ( Lee Sang-Ho ) - Á¶¼±´ëÇб³ Ä¡°ú´ëÇÐ ¼Ò¾ÆÄ¡°úÇб³½Ç

Abstract

Er : YAG ·¹ÀÌÀúÀÇ »ó¾ÆÁú »èÁ¦È¿°ú¿Í ÀÌ¿¡ µû¸¥ ¿Âµµº¯È­¸¦ Æò°¡ÇÏ°íÀÚ ¹ß°ÅµÈ ¼Ò±¸Ä¡¿Í ´ë±¸Ä¡·Î »ó¾Æ¼¼°ü³» Á¶Á÷¾×°ú Ä¡¼ö³»¾ÐÀ» À¯ÁöÇÒ ¼ö ÀÖ´Â »ó¾ÆÁú ½ÃÆíÀ» Á¦ÀÛÇÏ°í ÀÇ pulsed Er : YAG ·¹ÀÌÀú(SDL-300EN, »ï¼ºÀüÀÚ, Çѱ¹)¸¦ handpieceÇüÀÇ Àü´Þ°è¸¦ ÀÌ¿ëÇÑ ºñÁ¢ÃË½Ä ¹æ¹ýÀ¸·Î Á¶»ç¼¼±â, pulse repetition rate, Á¶»ç½Ã°£, ¹° ºÐ»ç¿©ºÎ µîÀÇ Á¶»çÁ¶°ÇÀ» ´Þ¸®ÇÏ¿© »ó¾ÆÁú ¸é¿¡ Á¶»çÇÏ°í À̶§ÀÇ »èÁ¦·®°ú »ó¾ÆÁú µÎ²²¿¡ µû¸¥ ¿Âµµº¯È­, ±×¸®°í »èÁ¦ÇüŸ¦ Á¶»ç, ºÐ¼®ÇÏ¿© ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù. 1. ·¹ÀÌÀú Á¶»ç¼¼±â¿Í pulse repetition rate°¡ Ŭ¼ö·Ï, ±×¸®°í Á¶»ç½Ã°£ÀÌ ±æ¼ö·Ï »èÁ¦·®ÀÌ Áõ°¡µÇ¾ú´Ù(P<0.05). ±×·¯³ª 5HzÀÇ pulse repetition rate¿¡¼­´Â Á¶»ç½Ã°£¿¡ µû¸¥ »èÁ¦·®ÀÇ Â÷ÀÌ°¡ Å©Áö ¾Ê¾Ò´Ù. 2. »èÁ¦µÈ ¿Íµ¿Àº ºñ±³Àû º¯¿¬ºÎ°¡ ¸íÈ®ÇÏ°í ±ú²ýÇÏ¿´À¸¸ç ¿Íµ¿ÀÇ ¹Ù´ÚÀº ¿øÃßÇüÀÌ¿´À¸¸ç ºÎµå·¯¿ü´Ù. Á¶»ç¼¼±â¿Í pulse repetition rate°¡ Ŭ¼ö·Ï, ±×¸®°í Á¶»ç½Ã°£ÀÌ ±æ¼ö·Ï ¿Íµ¿ÀÇ »óºÎ Á÷°æÀÌ ³Ð¾úÀ¸¸ç 150mJ, 5Hz, 5sec¿¡¼­´Â ¿Íµ¿º¯¿¬ºÎ¿¡ ¾à°£ÀÇ crackÀÌ °üÂûµÇ¾ú´Ù. 3. ·¹ÀÌÀú Á¶»ç¼¼±â¿Í pulse repetition rate°¡ Ŭ¼ö·Ï, ±×¸®°í Á¶»ç½Ã°£ÀÌ ±æ¼ö·Ï »ó¾ÆÁúÀÇ ¿Âµµ°¡ ´õ ¸¹ÀÌ »ó½ÂÇÏ¿´À¸¸ç ½ÃÆíÀÇ µÎ²²°¡ µÎ²¨¿ï¼ö·Ï ¿Âµµ»ó½ÂÀÌ Àû¾ú´Ù(P<0.05). 4. ¹°À» ºÐ»çÇÏ¸ç ·¹ÀÌÀú¸¦ Á¶»çÇÒ °æ¿ì ¹°À» ºÐ»çÇÏÁö ¾ÊÀº °æ¿ì¿¡ ºñÇØ ¿Âµµ»ó½ÂÀÌ ¸Å¿ì °¨¼ÒµÇ¾ú´Ù(P<0.05). ÀÌ»óÀÇ °á°ú¸¦ Á¾ÇÕÇØ º¼ ¶§ Er : YAG ·¹ÀÌÀú¸¦ »ó¾ÆÁú¿¡ Á¶»çÇÒ °æ¿ì ¿Íµ¿ÀÇ ÇüÅ°¡ ¸íÈ®ÇÏ°í ¹°À» ºÐ»çÇÒ °æ¿ì ¿Âµµ»ó½ÂÀÌ ¸¹ÀÌ À¯¹ßµÇÁö ¾ÊÀ¸¹Ç·Î½á »èÁ¦·ÂÀÌ ÁÁ°í Ä¡¼ö¿¡ À¯ÇØÀÛ¿ëÀÌ ¾ø´Â °ÍÀ¸·Î »ý°¢µÈ´Ù. ÇâÈÄ ÀÓ»ó¿¡¼­ Ä¡ÁúÀ» Á¦°ÅÇϴµ¥ È¿À²ÀûÀ¸·Î ÀÌ¿ëµÇ±â À§Çؼ­´Â ´õ¿í Å©°í ÀÌ¿¡ µû¸¥ ¿Âµµ»ó½ÂÀ» ÃÖ¼Ò·Î ÇÒ ¼ö ÀÖ´Â Á¶»ç ½Ã½ºÅÛ ¹× ¹æ¹ý¿¡ ´ëÇÑ ¿¬±¸°¡ °è¼ÓÀûÀ¸·Î ÀÌ·ç¾îÁ®¾ß ÇÒ °ÍÀ¸·Î »ç·áµÈ´Ù.

The purpose of this study was to investigate the effects of Er : YAG laser on cutting efficacy and temperature changes of dentin. We used the dentin specimens of human premolars and molars which contain the physiologic saline and maintain the pulpal pressure in dentinal tubules. Each specimen was exposed to Er : YAG laser with non-contact handpiece type delivery system under different treatment condition of irradiation energy, pulse repetition rate, and exposure time. Two procedures were conducted by the presence of water flow during lasing. The specimens were grouped by thickness of dentin. We investigated the cavity pattern, volume, and temperature change of dentin specimen to determine the cutting efficacy and temperature rise of Er : YAG laser, and obtained following results. 1. Cutting volume of dentin was increased by increasing the irradiation energy, pulse repetition rate, and exposure time(P<0.05). 2. Margins of abulated cavities were sharp and clean and floors of cavities were conical in shape and showing smooth surfaces. Upper diameter of abulated cavities were increasing as laser parameter of irradiation energy, pulse repetition rate, and exposure time were increased. A few cracks were observed on abulated surfaces under treatment condition of laser parameter with 150mJ, 5Hz, and 5sec. 3. Temperature was increased as laser parameter of irradiation energy, pulse repetition rate, and exposure time were increased, and temperature rise was decreased as dentin thickness was increased(P<0.05). 4. Temperature rise was decreased under water flow compared with no water flow during laser exposure(P<0.05). From these results, we think that the method of using a Er:YAG laser would be effective and safe in cutting dentin for clinical application.

Å°¿öµå

·¹ÀÌÀú;¾îºñ¿ò ¾ß±×;»ó¾ÆÁú;»èÁ¦È¿°ú;¿Âµµ»ó½Â
Laser;Er:YAG;Dentin;Cutting efficacy;Temperature rise

¿ø¹® ¹× ¸µÅ©¾Æ¿ô Á¤º¸

 

µîÀçÀú³Î Á¤º¸

KCI