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EFFECT OF SOFT-START LIGHT CURING ON THE POLYMERIZATION AND THE CONTRACTION STRESS OF COMPOSITE RESIN
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KMID : 0358920050320020332
Abstract
º» ¿¬±¸¿¡¼´Â ±âÁ¸ÀÇ ÇÒ·Î°Õ ±¤ÁßÇձ⸦ ÀÌ¿ëÇÏ¿© 40ÃÊ°£ Á¶»çÇÏ¿© º¹ÇÕ·¹ÁøÀ» ÁßÇÕÇÑ °æ¿ì¿Í ÇöóÁ ±¤ÁßÇձ⸦ ÀÌ¿ëÇÑ °í°µµÀÇ ÁßÇÕ ¹× ¿Ï¼Ó±â½Ã ÁßÇÕ ¹æ½Ä, ±×¸®°í LED ±¤ÁßÇձ⸦ ÀÌ¿ëÇÑ Åë¹ýÀÇ ÁßÇÕ°ú ¿Ï¼Ó±â½Ã ÁßÇÕ ¹æ½ÄÀ¸·Î º¹ÇÕ·¹ÁøÀ» ÁßÇÕÇÏ¿© ¹ß»ýµÇ´Â ¼öÃàÀÀ·ÂÀ» ºñ±³ÇÏ°í ¹Ì¼¼°æµµ¸¦ ÃøÁ¤ÇÏ¿© ÁßÇÕµµ¸¦ Æò°¡ÇÏ¿´´Ù.
³»°æ 7mm, ¿Ü°æ 10mmÀÇ ¾ÆÅ©¸±¸¯ ÁÖÇüÀ» Á¦ÀÛÇÏ°í ¿Ü¸é¿¡ ½ºÆ®·¹ÀΰÔÀÌÁö¸¦ ºÎÂø ½ÃŲ µÚ °¢°¢ÀÇ ±¤¿ø¿¡ µû¸¥ ÁßÇÕ¸ðµå·Î ±¤ÁßÇÕ ÇÏ¿´´Ù. ±¤Á¶»ç ½ÃÁ¡ºÎÅÍ 1ÃÊ °£°ÝÀ¸·Î 600ÃÊ°£ ¼öÃàÀÀ·ÂÀ» ÃøÁ¤ÇÏ¿´À¸¸ç, ÁßÇÕ 24½Ã°£ ÈÄ °¢ ±ºÀÇ ¹Ì¼¼°æµµ¸¦ ÃøÁ¤ÇÏ¿© Åë°è ºÐ¼®ÇÏ¿´´Ù. ¼öÃàÀÀ·Â ÃøÁ¤ ÈÄ ½ÃÆíÀ» Á¾´ÜÇÏ¿© ÁÖ»çÀüÀÚÇö¹Ì°æÀ¸·Î ·¹Áø¼öº¹¹°°ú ¾ÆÅ©¸±¸¯ ÁÖÇü °è¸éÀ» °üÂûÇÏ¿´´Ù.
ÀÌ»óÀÇ ½ÇÇèÀ» ÅëÇØ ¾òÀº °á°ú´Â ´ÙÀ½°ú °°´Ù.
1. ÇöóÁ ±¤°ú LED ±¤¿øÀÇ ¿Ï¼Ó±â½Ã ÁßÇÕ¹æ½ÄÀº °¢°¢ÀÇ ±âº» ÁßÇÕ¹æ½Ä¿¡ ºñÇØ ÁßÇÔ 10ºÐ ÈÄ¿¡ ¼öÃàÀÀ·Â °¨¼Ò¸¦ º¸¿´´Ù(P<0.05).
2. ¿Ï¼Ó±â½Ã ÁßÇÕ¹æ½ÄÀÇ ÇöóÁ ±¤ÀÌ °¡Àå ³·Àº ¼öÃàÀÀ·ÂÀ» º¸¿´À¸³ª ¹Ì¼¼°æµµ ¶ÇÇÑ °¡Àå ³·¾Ò´Ù(P<0.05).
3. ¿Ï¼Ó±â½Ã ÁßÇÕ¹æ½ÄÀÇ LED ±¤ÁßÇÕÀº ±âÁ¸ÀÇ ÇÒ·Î°Õ ±¤°ú LED ±¤ÁßÇÕ ¹æ¹ý¿¡ ºñÇÏ¿© ³·Àº ¼öÃàÀÀ·ÂÀ» º¸¿´´Ù(P<0.05).
4. ¿Ï¼Ó±â½Ã ÁßÇÏÀå½ÄÀÇ LED ±¤À¸·Î Á¶»çÇÑ ½ÃÆíÀÇ ¹Ì¼¼°æµµ´Â ´ÜÀϱ¤µµ·Î Á¶»çÇÑ ÇÒ·Î°Õ ±¤°ú LED ±¤ÁßÇÕ°ú ºñ±³ÇÏ¿© À¯ÀÇÇÒ¸¸ÇÑ Â÷ÀÌ°¡ ³ªÅ¸³ªÁö ¾Ê¾Ò´Ù(P>0.05).
5. ±âÁ¸ÀÇ ÇÒ·Î°Õ Àå°ú ¿Ï¼Ó±â½Ã ÁßÇÕ¹æ½ÄÀÇ LED·Î ÁßÇÕÇÑ ½ÃÆíÀÌ ÇöóÁ ±¤°ú ´ÜÀÏ°µµÀÇ LED·Î Á¶»çÇÑ ±ºº¸´Ù ´õ ³ªÀº ¹ø¿¬ºÀ¼â¸¦ º¸¿´´Ù.
The purpose of this study was to evaluate the influence of soft-start light curing on contraction stress and hardness of composite resin.
Composite resin mold was cured using the one-step continuous curing method with three difference light sources; conventional halogen light curing for 40 seconds at 400 mw/§², plasma arc light curing for 6 seconds at 1300 mW/§² and LED light curing for 10 seconds at 700 mW/§². For the soft-start curing method 2 seconds light exposure at 650 mW/§² followed by 3 seconds at 1300 mW/§² and exponential increase with 5 seconds followed by 10 seconds at 700 mW/§² were used.
Contraction stress was measured using strain gauge method and Vickers hardness was measured 24 hours after polymerization at the top and bottom of specimens.
Resin-acrylic interfaces were observed using a scanning electron micro scope(SEM).
The results of present study can be summarized as follows:
1. Contraction stresses at 10 min after polymerization were significantly reduced with the soft-start curing both in plasma and LED light sources(P<0.05).
2. Plasma light curing with soft-start resulted in not only the lowest contraction stress, but also the lowest hardness (P<0.05).
3. LED light curing with soft-start showed lower contraction stress than the one-step continuous halogen and LED light curing(P<0.05).
4. Micro hardness of specimens cured by LED light with soft-start was equivalent to that of cured by the one-step continuous halogen and LED light(P>0.05).
5. Curing by LED light with soft-start and conventional halogen light resulted in better marginal sealing than plasma light and one-step LED light curing.
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Soft-start light curing;Contraction stress;Microhardness
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