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A STUDY ON THE CHANGES IN DEGREE OF CONVERSION OF DUAL-CURE RESTORATIVE MATERIALS WITH TIME-ELAPSE

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Abstract

½É¹ÌÀû ¼öº¹Àç·áÀÎ º¹ÇÕ ·¹Áø°ú ±Û·¡½º ¾ÆÀÌ¿À³ë¸Ó ½Ã¸àÆ®´Â ÁßÇÕ¹æ½Ä¿¡ µû¶ó È­ÇÐÁßÇÕÇü, ±¤ÁßÇÕÇü, ±×¸®°í ÀÌ µÎ °¡Áö ÁßÇÕ¹æ½ÄÀ» °âºñÇÑ ÀÌÁßÁßÇÕÇüÀ¸·Î ºÐ·ùÇÒ ¼ö ÀÖ´Ù. È­ÇÐÁßÇÕÇü°ú ±¤ÁßÇÕÇü¿¡ ´ëÇؼ­´Â Áö±Ý±îÁö ´Ù¼öÀÇ º¸°í°¡ ÀÖ¾úÀ¸³ª, ÃæÀü¿ë º¹ÇÕ ·¹ÁøÀÇ °æ¿ì À̵é°ú ÀÌÁßÁßÇÕÇüÀ» ºñ±³ÇÑ ¿¹´Â ¾ÆÁ÷ ã±â Èûµç ½ÇÁ¤À̾úÀ¸¹Ç·Î, ÀÌ·¯ÇÑ °üÁ¡¿¡¼­ÀÇ ¿¬±¸°¡ ÇÊ¿äÇÒ °ÍÀ¸·Î »ç·áµÇ¾ú´Ù.
ÀÌ ¿¬±¸¿¡¼­´Â ÀÌÁßÁßÇÕ ¼öº¹Àç°¡ ´ÜÀÏÁßÇÕ¹æ½Ä¿¡ ºñÇØ ¾î¶°ÇÑ Æ¯¼ºÀ» º¸ÀÌ´ÂÁö¸¦ Ž±¸ÇÏ°íÀÚ ÇÏ¿´´Ù. »ç¿ëµÈ Àç·á´Â ±¤ÁßÇÕÇü º¹ÇÕ ·¹ÁøÀÎ Veridonfil-Photo¿Í ÀÌÁßÁßÇÕÇüÀÎ Bis-core, ÀÌÁßÁßÇÕÇüÀÇ ±Û·¡½º ¾ÆÀÌ¿À³ë¸Ó ½Ã¸àÆ®ÀÎ Fuji ¥± LC¿Í È­ÇÐÁßÇÕÇüÀÎ Ketac-filÀ» »ç¿ëÇÏ¿´´Ù. °¡·Î 30mm, ¼¼·Î 30mm, ³ôÀÌ 1mm¿Í 3mmÀÎ µÎ Á¾·ùÀÇ ¾ÆÅ©¸±¸¯ ¸ôµå Áß¾Ó¿¡ Á÷°æ 7mmÀÇ holeÀ» Çü¼ºÇÏ¿©, ¿©±â¿¡ 4 Á¾ÀÇ ¼öº¹À縦 ÃæÀüÇÏ¿´´Ù. ÃæÀü Á÷ÈĺÎÅÍ ½ÃÀÛÇÏ¿© 24½Ã°£ °æ°ú½Ã±îÁö ÀÏÁ¤ ½Ã°£ÀÇ °£°ÝÀ¸·Î Ç¥¸é, 1mm, 3mm ±íÀÌ¿¡¼­ÀÇ °æµµ¸¦ ¹Ì¼¼°æµµ°è(Shimadzu Micro Hardness Tester HMV-2000, Shimadzu Co. Japan)·Î ÃøÁ¤ÇÏ¿´´Ù. ÃøÁ¤Ä¡¸¦ Åë°èó¸®ÇÏ¿© ¾òÀº °á°ú´Â ´ÙÀ½°ú °°´Ù.
1. 4 Á¾ÀÇ ¼öº¹Àç ¸ðµÎ¿¡¼­, ÁßÇÕÁ÷ÈÄ¿¡ ºñÇØ 24½Ã°£ °æ°úÈÄÀÇ ¹Ì¼¼°æµµ°¡ Áõ°¡µÇ¾ú´Ù.
2. ÁßÇÕ Á÷ÈĺÎÅÍ 24½Ã°£ °æ°ú½ÃÁ¡±îÁöÀÇ ¹Ì¼¼°æµµ¸¦ ÃøÁ¤ÇÑ °á°ú, Ketac-filÀ» Á¦¿ÜÇÑ ³ª¸ÓÁö ¼öº¹Àç¿¡¼­´Â °¢ ±íÀÌ°£ °æµµÀÇ Â÷ÀÌ°¡ ÀÖ¾ú´Ù.
3. °¢ ¼öº¹Á¦ÀÇ ÃÖÁ¾ÁßÇÕ¿¡ µµ´ÞÇÏ´Â ½Ã°£À» Á¶»çÇÑ °á°ú, ÀÌÁßÁßÇÕÇüÀÌ 3mmÀÇ ±íÀÌ¿¡¼­ ±¤ÁßÇÕÇüÀ̳ª È­ÇÐÁßÇÕÇü¿¡ ÀÌÇØ ÁßÇÕÀÌ ´õ ¿À·¡ Áö¼ÓµÈ °ÍÀ¸·Î ³ªÅ¸³µ´Ù.
ÀÌ»óÀÇ °á°ú¿¡¼­ Á¶»ç±¤ÀÌ ÃæºÐÈ÷ µµ´ÞÇÏÁö ¸øÇÏ¿© ÁßÇÕÀÌ ÇöÀúÈ÷ ¶³¾îÁö´Â ¼öº¹ÀçÀÇ ½ÉºÎ¿¡µµ ÀÌÁßÁßÇÕ¹æ½ÄÀ» »ç¿ëÇÒ °æ¿ì¿¡´Â Áö¼ÓÀûÀÎ ÁßÇÕ¹ÝÀÀÀÌ ÀϾ ÁßÇÕµµ°¡ Áõ°¡ÇÏ´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù.
For the purpose of elucidating the polymerization modes of dual-cure restorative materials and comparing them with single-cure restorative materials, a study was performed on the light-cured composite resin, dual-cure composite resin, dual-cure glass ionomer cement and chemical-cure glass ionomer cement.
By measuring the microhardness of each material at Omm, 1mm and 3mm depth during initial 24 hours with predetermined interval, the state of polymerization and degree of conversion was indirectly evaluated for each material, and obtained results are as follows
1. All of four materials tested showed significant increase in microhardness after 24hrs compared with just after curing starts.
2. In all materials except Ketac-fil, there showed a significant difference in microhardness between each depth at each time interval.
3. In the test of lap time till final curing for each material, the polymerization process was revealed
to last longer in the dual-cure type materials than in single-cure type materials at 3mm depth.
Based on the results above, it was demonstrated with materials of dual cure mode that the degree of conversion increases by successive curing reactions even in the deeper layers where sufficient curing light is impermeable.

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ÁßÇÕµµ;¹Ì¼¼°æµµ;ÀÌÁßÁßÇÕÇü ¼öº¹Àç;Polymerization;Microhardness;Dual cure

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