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Polymerization of dual cured composites by different thickness

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±èÀ±ÁÖ ( Kim Yun-Ju ) - °æºÏ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç
Áø¸í¿í ( Jin Myoung-Uk ) - °æºÏ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç
±è¼º±³ ( Kim Sung-Kyo ) - °æºÏ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç
±ÇÅ¿± ( Kwon Tae-Yub ) - °æºÏ´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°ú»ýüÀç·áÇб³½Ç
±è¿µ°æ ( Kim Young-Kyung ) - °æºÏ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç

Abstract

º» ¿¬±¸´Â ÀÌÁß ÁßÇÕÇü º¹ÇÕ·¹Áø¿¡¼­ Àç·áÀÇ µÎ²², ÃæÀü¹æ¹ý ¹× ÁßÇÕ¹æ¹ý¿¡ µû¸¥ ÁßÇÕµµ¸¦ ¹Ì¼¼°æµµ ½ÃÇèÀ» ÀÌ¿ëÇÏ¿© ÃøÁ¤ÇÏ°íÀÚ ÇÏ¿´´Ù. ÀÌÁß ÁßÇÕÇü º¹ÇÕ·¹ÁøÀ¸·Î´Â MultiCore Flow (Ivovlar Vivadent AG, Schaan, Liechtenstein)¿Í Bis-Core (Bisco Inc., Schaumburg IL, USA)¸¦ »ç¿ëÇÏ¿´´Ù. ½ÃÆíÀÇ Á¦ÀÛÀº °¢°¢ µÎ²²°¡ 2(´ÜÀÏÃæÀü), 4 (´ÜÀÏÃæÀü), 6 (´ÜÀÏÃæÀü°ú ÀûÃþÃæÀü), 8 (´ÜÀÏÃæÀü°ú ÀûÃþÃæÀü) §®ÀÇ Teflon mold¿¡ Àç·á¸¦ ÁÖÀÔÇÑ ´ÙÀ½ ÇÒ·Î°Õ ±¤ÁßÇÕ±â (Optilux 501, Kerr, Danbury, USA)¸¦ »ç¿ëÇÏ¿© ±¤ÁßÇÕÇϰųª ¾Ï½Ç¿¡¼­ 30ºÐ µ¿¾È ±â´Ù¸° ÈÄ(ÀÚ°¡ ÁßÇÕ) Teflon mold¿¡¼­ Á¦°ÅÇÏ¿´´Ù. Á¦°ÅÇÑ ½ÃÆíÀº Áõ·ù¼ö¿¡ 24½Ã°£ µ¿¾È º¸°üÇÑ ÈÄ °¢ ½ÃÆíÀÇ À­¸é°ú ¾Æ·§¸éÀ» 2000¹ø ¿¬¸¶Á¦¿Í PoGo system (Dentsply, Konstanz, Germany)À» ÀÌ¿ëÇÏ¿© ¸¶¹«¸®ÇÏ¿´´Ù. Digital microhardness tester (FM-7, Future-Tech Corp., Tokyo, Japan)¸¦ ÀÌ¿ëÇÏ¿© °æµµ°ª(Knoop hardness number)À» ÃøÁ¤ÇÏ¿´À¸¸ç À­¸éÀÇ °æµµ°ª/¾Æ·§¸éÀÇ °æµµ°ªÀ» ÀÌ¿ëÇÏ¿© °æµµºñ¸¦ °è»êÇÏ¿´´Ù. °èÃøÄ¡´Â one-way ANOVA·Î Åë°è ºÐ¼® ÈÄ »çÈÄ°ËÁ¤Àº Scheffe ´ÙÁߺñ±³¹ýÀ» ÀÌ¿ëÇÏ¿´´Ù. ÀÌÁß ÁßÇÕÇü º¹ÇÕ·¹ÁøÀÇ ÁßÇÕµµ¿¡ ´ëÇÑ µÎ²²ÀÇ ¿µÇâÀ» º¸¸é Àç·á¿¡ µû¶ó ´Ù¸¥ °á°ú¸¦ º¸¿´´Ù. 2, 4, 6 mm ±º¿¡¼­´Â MulriCore Flow¿Í Bis-Core ¸ðµÎ µÎ²²¿¡ ÀÇÇÑ ¿µÇâÀ» ¹ÞÁö ¾Ê¾ÒÁö¸¸ 8 mm ±º¿¡¼­´Â MultiCore FlowÀÇ ¾Æ·§¸é¿¡¼­ ´Ù¸¥ µÎ²²ÀÇ ±ºº¸´Ù ³·Àº °æµµ°ªÀ» º¸¿´´Ù. ÃæÀü¹æ¹ý¿¡ µû¸¥ ÁßÇÕµµÀÇ Â÷À̸¦ º¸¸é, Àç·áÀÇ µÎ²²³ª Àç·á¿¡ µû¶ó ´Ù¸¥ °á°ú¸¦ º¸¿´´Ù. 6 mm ±º¿¡¼­´Â ´ÜÀÏÃæÀü±º°ú ÀûÃþÃæÀü±º »çÀÌ¿¡ Â÷À̸¦ º¸ÀÌÁö ¾Ê¾ÒÀ¸³ª, 8 mm ±º¿¡¼­´Â Bis-Core¿¡¼­´Â Â÷ÀÌ°¡ ¾ø´Â ¹Ý¸é MultiCore Flow¿¡¼­´Â ´ÜÀÏÃæÀüÇÑ ±ºÀÌ ÀûÃþÁßÀüÇÑ ±ºº¸´Ù ³·Àº °æµµºñ¸¦ º¸¿´´Ù. ÁßÇÕ¹æ¹ý¿¡ µû¸¥ ÁßÇÕµµÀÇ Â÷À̸¦ º¸¸é, Àç·á¿¡ µû¶ó ´Ù¸¥ °á°ú¸¦ º¸¿´´Ù. Bis-CoreÀÇ °æ¿ì¿¡´Â À­¸é°ú ¾Æ·§¸é ¸ðµÎ¿¡¼­ ÀÌÁß ÁßÇÕ ½ÃŲ ±ºÀÌ ÀÚ°¡ ÁßÇÕ ½ÃŲ ±ºº¸´Ù ³ôÀº °æµµ°ªÀ» º¸¿´´Ù. ±×·¯³ª MultiCore FlowÀÇ °æ¿ì, À­¸é¿¡¼­´Â ÀÌÁßÁßÇÕ ½ÃŲ ±ºÀÌ ´õ ³ôÀº °æµµ°ªÀ» º¸¿´Áö¸¸ ¾Æ·§¸é¿¡¼­´Â ´õ ³·Àº °ªÀ» º¸¿´´Ù. µû¶ó¼­ º» ¿¬±¸ÀÇ °á°ú¿¡ µû¸£¸é ÄÚ¾î¿ë ÀÌÁß ÁßÇÕÇü º¹ÇÕ·¹ÁøÀ» ±íÀº ¿Íµ¿¿¡ ÃæÀüÇÒ °æ¿ì ÀûÃþÃæÀüÀÌ ÃßõµÇ¸ç, ¶ÇÇÑ ±¤ÁßÇÕÀ» ÇØ ÁÜÀ¸·Î½á ´õ ÁÁÀº ¹°¸®Àû ¼ºÁúÀ» ±â´ëÇÒ ¼ö ÀÖÀ» °ÍÀ¸·Î »ç·áµÈ´Ù.

The purpose of this study was to evaluate the effect of thickness, filling methods and curing methods on the polymerization of dual cured core materials by means of microhardness test. Two dual cured core materials, MultiCore Flow (Ivoclar Vivadent AG, Schaan, Liechtenstein) and Bis-Core (Bisco Inc., Schaumburg, IL, USA) were used in this study. 2 mm (bulky filled), 4 mm (bulky filled), 6 mm (bulky and incrementally filled) and 8 mm (bulky and incrementally filled)-thickness specimens were prepared with light cure or self cure mode. After storage at for 24 hours, the Knoop hardness values (KHN) of top and bottom surfaces were measured and the microhardness ratio of top and bottom surfaces was calculated. The data were analyzed using one-way ANOVA and Scheffe multiple comparison test, with = 0.05. The effect of thickness on the polymerization of dual cured composites showed material specific results. In 2, 4 and 6 mm groups, the KHN of two materials were not affected by thickness. However, in 8 mm group of MultiCore Flow, the KHN of the bottom surface was lower than those of other groups (p < 0.05). The effect of filling methods on the polymerization of dual cured composites was different by their thickness or materials. In 6 mm thickness, there was no significant difference between bulk and incremental filling groups. In 8 mm thickness, Bis-Core showed no significant difference between groups. However, in MultiCore Flow, the microhardness ratio of bulk filling group was lower than that of incremental filling group (p < 0.05). The effect of curing methods on the polymerization of dual cured composites showed material specific results. In Bis-Core, the KHN of dual cured group were higher than those of self cured group at both surfaces (p < 0.05). However, in MultiCore Flow, the results were not similar at both surfaces. At the top surface, dual cured group showed higher KHN than that of self cured group (p < 0.05). However, in the bottom surface, dual cured group showed lower value than that of self cured group (p < 0.05).

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Dual cured core materials;Thickness;Filling methods;Curing methods;Polymerization;Microhardness test

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