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EFFECT OF THE EXPONENTIAL CURING OF COMPOSITE RESIN ON THE MICROTENSILE DENTIN BOND STRENGTH OF ADHESIVES

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¼º¼Ò·¡ ( Seong So-Rae ) - ¼­¿ï´ëÇб³ Ä¡ÀÇÇдëÇпø Ä¡°úº¸Á¸Çб³½Ç
¼ÕÈ£Çö ( Son Ho-Hyun ) - ¼­¿ï´ëÇб³ Ä¡ÀÇÇдëÇпø Ä¡°úº¸Á¸Çб³½Ç
Á¶º´ÈÆ ( Cho Byung-Hoon ) - ¼­¿ï´ëÇб³ Ä¡ÀÇÇдëÇпø Ä¡°úº¸Á¸Çб³½Ç
ÀÌÀκ¹ ( Lee In-Bog ) - ¼­¿ï´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç
¼­´ö±Ô ( Seo Deog-Gyu ) - ¼­¿ï´ëÇб³ Ä¡ÀÇÇдëÇпø Ä¡°úº¸Á¸Çб³½Ç

Abstract

Á¢ÂøÁ¦¸¦ ÅëÇØ Ä¡¾Æ¿¡ Á¢ÂøµÇ´Â »óºÎÀÇ º¹ÇÕ·¹ÁøÀÇ ºü¸¥ ÁßÇÕÀº Á¢ÂøÁ¦Ãþ¿¡ ³ôÀº ÁßÇÕ¼öÃàÀÀ·ÂÀ» ¹ß»ý½ÃŲ´Ù. ÁßÇÕ¼öÃàÀÀ·ÂÀ» °æ°¨½ÃÅ°±â À§Çؼ­, LED ±¤ÁßÇÕ±âÀÇ ÇϳªÀÎ Elipar FreeLight 2 (3M ESPE, USA)¿¡¼­´Â ÃÖÃÊ 5ÃÊ À̳»¿¡ ±¤°­µµ¸¦ Áõ°¡½ÃÅ°´Â exponential ÁßÇÕ¹ýÀ» äÅÃÇÏ°í ÀÖ´Ù. º» ¿¬±¸¿¡¼­´Â ªÀº ½Ã°£³»¿¡ ±¤°­µµ¸¦ Áõ°¡½ÃÅ°´Â exponential ÁßÇÕ¹ýÀÌ º¹ÇÕ·¹ÁøÀÇ Ãʱâ ÁßÇÕ¼öÃà¼Óµµ¸¦ È¿°úÀûÀ¸·Î Á¶ÀýÇÒ ¼ö ÀÖ´ÂÁö¸¦ ¾Ë¾Æº¸±â À§ÇØ Á¢ÂøÁ¦ Àû¿ë ÈÄ »óºÎÀÇ º¹ÇÕ·¹ÁøÀ» exponential ÁßÇÕ¹ý°ú continuous ÁßÇÕ¹ýÀ¸·Î ÁßÇÕÇÏ¿© »ó¾ÆÁúÁ¢ÂøÁ¦ÀÇ ¹Ì¼¼ÀÎÀåÁ¢Âø°­µµ¸¦ ºñ±³ÇÏ¿´´Ù. 3M»çÀÇ Scotchbond Multipurpose Plus (MP), Single Bond 2 (SB), ¹× Adper Prompt (AP)ÀÇ ¼¼ Á¾·ùÀÇ Á¢ÂøÁ¦¸¦ ¹ßÄ¡ÇÑ ´ë±¸Ä¡ÀÇ ±³ÇÕ¸é »ó¾ÆÁú¿¡ Á¦Á¶»çÀÇ Áö½Ã¿¡ µû¶ó Àû¿ëÇÏ°í, È¥ÇÕÇü º¹ÇÕ·¹ÁøÀÎ Denfil (Vericom, Korea)À» µÎ °¡Áö±¤ÁßÇÕ¹æ¹ýÀ¸·Î ÁßÇÕÇÏ¿´´Ù. Á¢Âø ÈÄ 48½Ã°£¿¡ ¹Ì¼¼ÀÎÀåÁ¢Âø°­µµ¸¦ ÃøÁ¤ÇÏ°í, ÆÄÀý¸éÀº FE-SEM.À¸·Î °üÂûÇÏ¿´´Ù. ±× °á°ú, °¢°¢ÀÇ Á¢ÂøÁ¦¿¡¼­ ÁßÇÕ¹æ¹ý¿¡ µû¸¥ Á¢Âø°­µµÀÇ Â÷ÀÌ´Â °üÂûÇÒ ¼ö ¾ø¾ú´Ù(Two-way ANOVA, p > 0.05). MP¿Í SBÀÇ ¹Ì¼¼ÀÎÀåÁ¢Âø°­µµ´Â AP¿¡ ºñÇØ À¯ÀÇÇÏ°Ô ³ô¾Ò´Ù(p < 0.05). ´ëºÎºÐÀÇ ÆÄÀý½ÃÆí¿¡¼­´Â È¥ÇÕÇü ÆÄÀýÀÌ °¡Àå ¸¹ÀÌ °üÂûµÇ¾úÀ¸³ª, ÁßÇÕ¹æ¹ý¿¡ µû¸¥ ÆÄÀý¾ç»óÀÇ Â÷ÀÌ´Â ¾ø¾ú´Ù. °á·ÐÀûÀ¸·Î 5ÃÊ À̳»ÀÇ ÂªÀº ½Ã°£¿¡ ±¤°­µµ¸¦ Áõ°¡½ÃÅ°´Â exponential ÁßÇÕ¹ýÀº continuous ÁßÇÕ¹ý°ú ºñ±³ÇÏ¿© »ó¾ÆÁúÁ¢ÂøÁ¦ÀÇ ¹Ì¼¼ÀÎÀåÁ¢Âø°­µµ¿¡ ¿µÇâÀ» ÁÖÁö ¾Ê¾Ò´Ù.

Objectives: Rapid polymerization of overlying composite resin causes high polymerization shrinkage stress at the adhesive layer. In order to alleviate the shrinkage stress, increasing the light intensity over the first 5 seconds was suggested as an exponential curing mode by an LED light curing unit (Elipar FreeLight2, 3M ESPE). In this study, the effectiveness of the exponential curing mode on reducing stress was evaluated with measuring microtensile bond strength of three adhesives after the overlying composite resin was polymerized with either continuous or exponential curing mode. Methods: Scotchbond Multipurpose Plus (MP, 3M ESPE), Single Bond 2 (SB, 3M ESPE), and Adper Prompt (AP, 3M ESPE) were applied onto the flat occlusal dentin of extracted human molar. The overlying hybrid composite (Denfil, Vericom, Korea) was cured under one of two exposing modes of the curing unit. At 48h from bonding, microtensile bond strength was measured at a crosshead speed of 1.0 mm/min. The fractured surfaces were observed under FE-SEM. Results: There was no statistically significant difference in the microtensile bond strengths of each adhesive between curing methods (Two-way ANOVA, p > 0.05). The microtensile bond strengths of MP and SB were significantly higher than that of AP (p < 0.05). Mixed failures were observed in most of the fractured surfaces, and differences in the failure mode were not observed among groups. Conclusion: The exponential curing method had no beneficial effect on the microtensile dentin bond strengths of three adhesives compared to continuous curing method.

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ÁßÇÕ¼öÃà;Exponential ÁßÇÕ¹ý;»ó¾ÆÁúÁ¢ÂøÁ¦;¹Ì¼¼ÀÎÀåÁ¢Âø°­µµ;ÆÄÀý¾ç»ó
Polymerization shrinkage;Exponential curing;Dentin adhesive;Microtensile bond strength;Failure mode

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