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EVALUATION OF THERMAL DIFFUSION IN LOWER 2nd PRIMARY MOLAR WITH THERMOGRAPHY AND FINITE ELEMENT ANALYSIS

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Abstract

ÀÓ»ó¿¡¼­ ¼³ºñÀÇ ³ëÈijª °íÀå µîÀ¸·Î ÀÎÇØ °í¼Ó ÇÚµåÇǽºÀÇ ¹° ºÐ»ç¿¡ ÀÇÇÑ ³Ã°¢ÀÌ Á¾Á¾ ºÒ¿ÏÀüÇÏ°Ô ÀϾ ¼ö ÀÖ´Ù. ¶ÇÇÑ ¼ºÀο¡ ºñÇØ Ä¡·á¿¡ °üÇÑ °øÆ÷°¡ ½ÉÇÏ¿© ºñÇùÁ¶ÀûÀÎ ¼Ò¾ÆȯÀÚÀÇ °æ¿ì¿¡´Â ¹°ÀÇ ºÐ»ç³ª °í¼Ó ÈíÀαâÀÇ »ç¿ëÀ» °ÅºÎÇϰųª Áö±ØÈ÷ Çø¿ÀÇÏ´Â °æ¿ìµµ µå¹°Áö ¾Ê´Ù. ÀÌó·³ ³Ã°¢ÀÌ ÃæºÐÈ÷ ÀÌ·ïÁöÁö ¾ÊÀº »óȲ¿¡¼­ ½ÃÇàµÇ´Â ´Ù¾çÇÑ ¼ú½ÄÀº Ä¡¼öÁ¶Á÷¿¡ Ä¡¸íÀûÀÎ ¼Õ»óÀ» °¡ÇÒ ¼ö ÀÖ´Ù. º» ¿¬±¸ÀÇ ¸ñÀûÀº ÀÓ»ó ¼öº¹ ¼ú½ÄÀ» ½ÃÇàÇÏ´Â µ¿¾È °¢ Ä¡¾ÆÇ¥¸é¿¡¼­ ¹ß»ýµÇ´Â ¿­ÀÌ Ä¡¼ö ³»ºÎ·Î Àü´ÞµÇ´Â ¾ç»óÀ» Á¶»çÇϱâ À§ÇÔÀ̾ú´Ù. ¼®°í ºí·Ï¿¡ ½Ä¸³µÈ 90°³ÀÇ ÇÏ¾Ç Á¦2À¯±¸Ä¡¸¦ ´ë»óÀ¸·Î ¼öÁ¾ÀÇ ¼öº¹ ¼ú½ÄÀ» ½ÃÇàÇÏ¿´°í, ÇØ´ç Ä¡¾ÆÇ¥¸é¿¡¼­ ¹ß»ýµÇ´Â ¿­ÀÇ ¿Âµµ¸¦ Àû¿Ü¼± Ä«¸Þ¶ó¿Í thermography¸¦ ÀÌ¿ëÇÏ¿© ÃøÁ¤ÇÏ°í, À̸¦ Åä´ë·Î À¯ÇÑ¿ä¼Ò ºÐ¼®À» ÅëÇÑ Ä¡Áú³» ¿­Àüµµ¿¡ °üÇÑ Æò°¡¸¦ ½ÃÇàÇÏ¿´´Ù. º» ¿¬±¸¿¡¼­ ½ÃÇàµÈ ÀÓ»ó ¼ú½ÄÀÇ ÁÖ¼ö ÇÏ ÃÖ°í Ç¥¸é ¿Âµµ´Â 30.8¡É~43.6¡É, ºñ ÁÖ¼ö ÇÏ¿¡¼­´Â 51.2¡É~103.4¡ÉÀÇ ¹üÀ§¸¦ º¸¿´´Ù. ¼ú½Ä Áß¿¡¼­´Â Ä¡°ü Çü¼º°úÁ¤ÀÌ °¡Àå ³ôÀº ¿Âµµ¸¦, ¾Æ¸»°¨ Á¦°Å °úÁ¤ÀÌ °¡Àå ³·Àº Ç¥¸é¿Âµµ¸¦ º¸¿´´Ù. µ¿ÀÏ ¼ú½Ä ³»¿¡¼­ÀÇ ÁÖ¼ö¿Í ºñ ÁÖ¼ö Á¶°Ç°£¿¡´Â ¸ðµç ¼ú½ÄÀÌ À¯ÀÇÇÑ Â÷¸¦ ³ªÅ¸³Â´Ù(p<0.05). À¯ÇÑ¿ä¼Ò ºÐ¼®¿¡¼­ ³ªÅ¸³­ Ä¡¼ö°¢ÀÇ ¿Âµµº¯È­´Â ¸ðµç ºñ ÁÖ¼ö Á¶°Ç¿¡¼­´Â Å« ÆøÀ¸·Î »ó½ÂÇÑ ¹Ý¸é, ÁÖ¼ö ÇÏ¿¡¼­´Â Àü¹ÝÀûÀ¸·Î ¹Ì¾àÇÑ º¯È­¸¦ º¸¿´´Ù. ÀÌ»óÀÇ °á°ú´Â °í¼Ó Àý»è±â¸¦ »ç¿ëÇÑ ¼öº¹ °úÁ¤¿¡ ÁÖ¼ö¿¡ ÀÇÇÑ ÃæºÐÇÑ ³Ã°¢ÀÌ Ä¡¼ö »ýÈ°·ÂÀÇ À¯Áö¸¦ À§Çؼ­ ÇʼöÀûÀÓÀ» ½Ã»çÇØÁØ´Ù. ÇâÈÄ º¸´Ù ´Ù¾çÇÑ ¼ú½Ä°ú Á¶°ÇÀ» ºÎ¿©ÇÑ À¯»ç ºÐ¾ßÀÇ ¿¬±¸°¡ ÃßõµÈ´Ù.
It is not a rare occasion that certain dental procedures involving tooth reduction being performed under inadequate water cooling due to a variety of reasons. This situation could possibly inflict the critical insult to the pulpal tissue of indicated tooth. The purpose of this experiment was to study the pattern of diffusion of external heat produced during routine dental procedures into the pulpal tissue. 30 stone blocks containing three lower second primary molars were used for certain restorative procedures and the temperature of the indicated tooth surface was measured by thermography(Inframetrics 600) and further used as a baseline data for the finite element analysis model fabrication designed in order to evaluate the pattern of thermal diffusion. The ranges of highest surface temperature measured from several dental procedures under water cooling and non-water cooling were 30.81--43.6¢¥ and 51.21C-103.41C respectively. Among procedures studied, crown preparation showed the highest value and amalgam removal showed the lowest. Comparisons between data measured under water cooling and non-water cooling conditions have shown the statistically significant difference(p<0.05). All the non-cooling conditions have shown the relatively larger increment of temperature change at the pulp horn area than the cooling conditions. The results of this study strongly indicate that the water coolant is the essential element in restorative procedures for the maintenance of healthy pulp Further related studies involving more procedures and conditions are recommended.

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À¯ÇÑ¿ä¼ÒºÐ¼®;¿­;¿­È®»êµµ ºÐ¼®;¿Íµ¿ Çü¼º;Finite Element Analysis;Heat;Thermography;Cavity Preparation

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