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Influence of light source and curing time on surface hardness of resin composites

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±è´ë¾÷ ( Kim Dae-Eop ) - ¿ø±¤´ëÇб³ Ä¡°ú´ëÇÐ ¼Ò¾ÆÄ¡°úÇб³½Ç
À̱¤Èñ ( Lee Kwang-Hee ) - ¿ø±¤´ëÇб³ Ä¡°ú´ëÇÐ ¼Ò¾ÆÄ¡°úÇб³½Ç
¾ÈÈ£¿µ ( Ahn Ho-Young ) - ¿ø±¤´ëÇб³ Ä¡°ú´ëÇÐ ¼Ò¾ÆÄ¡°úÇб³½Ç

Abstract

ÇöóÁ ¾ÆÅ© ±¤¿øÀ» »ç¿ëÇÏ´Â ±¤ÁßÇձ⸦ ÀúÃâ·Â ÇÒ·Î°Õ ±¤¿øÀ» »ç¿ëÇÏ´Â ÀüÅëÀûÀÎ ±¤ÁßÇÕ±â¿Í ºñ±³ Æò°¡Çϱâ À§ÇÏ¿© ¼¼ Á¾·ùÀÇ º¹ÇÕ·¹ÁøÀ» µÎ²²°¡ 2, 3, 4, 5mmÀÎ ¸ôµå¿¡ ÃæÀüÇÏ°í ·¹Áø »ó¸éÀ» ÇÒ·Î°Õ ±¤À¸·Î 40ÃÊ°£ ÇöóÁ±¤À¸·Î 3, 6, 9ÃÊ°£ Á¶»çÇÑ ÈÄ ·¹Áø »ó¸é°ú ÇϸéÀÇ Ç¥¸é¹Ì¼¼°æµµ¸¦ °¢°¢ ÃøÁ¤ÇÏ¿´´Ù. ·¹Áø½ÃÆí »ó¸éÀÇ Ç¥¸é°æµµ¿Í ÇϸéÀÇ Ç¥¸é°æµµ °£ÀÇ Â÷ÀÌ´Â, µÎ²² 2mm ½ÃÆí¿¡ ÇÒ·Î°Õ ±¤À» 40ÃÊ°£ Á¶»çÇÏ¿´°Å³ª ÇöóÁ±¤À» 9ÃÊ°£ Á¶»çÇÑ °æ¿ìµéÀ» Á¦¿ÜÇÏ°í, ¸ðµÎ À¯ÀÇÇÏ¿´´Ù(P<0.05). ·¹Áø½ÃÆí »ó¸éÀÇ Ç¥¸é°æµµ´Â Àüü ½ÇÇ豺µé¿¡¼­ ¼­·Î À¯ÀÇÇÑ Â÷ÀÌ°¡ ¾ø¾ú´Ù. ·¹Áø½ÃÆí ÇϸéÀÇ Ç¥¸é°æµµ´Â ÀüüÀûÀ¸·Î º¸¾Æ ÇÒ·Î°Õ ±¤À» 40ÃÊ°£ Á¶»çÇÑ ±ºµé¿¡¼­ °¡Àå ³ô¾Ò°í ÇöóÁ±¤ÀÇ Á¶»ç½Ã°£ÀÌ °¨¼ÒÇÔ¿¡ µû¶ó °¨¼ÒÇÏ¿´À¸¸ç ·¹Áø½ÃÆíÀÇ µÎ²²°¡ Áõ°¡ÇÔ¿¡ µû¶ó °¨¼ÒÇÏ¿´´Ù. ÀÌ»óÀÇ °á°ú´Â º¹ÇÕ·¹ÁøÀÇ ÁßÇÕ±íÀÌ Ãø¸é¿¡¼­ º¼ ¶§ 3, 6, 9ÃÊ°£ Á¶»çÇÏ´Â °íÃâ·Â ÇöóÁ±¤ÀÇ ÁßÇÕ´É·ÂÀÌ 40ÃÊ°£ Á¶»çÇÏ´Â ÀúÃâ·Â Çҷΰձ¤ÀÇ ÁßÇմɷ¿¡ ¹ÌÄ¡Áö ¸øÇÔÀ» ½Ã»çÇÑ´Ù.

The purpose of study was to compare the plasma are light with the halogen light in compostie resin curing. Three composite resin materials(Z-100. 3M, USA; Tetric Ceram. Vivadent, Liechtenstein; SureFil, Dentsply, USA) were filled in the teflon molds (4mm in diameter and 2,3,4,5mm in thickness) and cured with esther the conventional low-intensity light curing unit with a halogen lamp (Optilux 360, Demetron, U.S.A) for duration of 40 seconds or with the high-intensity light curing unit with a plasma are lamp (Flipo, Lokki, France) for duration of 3, 6, and 9 seconds. The intensity of halogen light was about 370mW/cm2 and that of plasma light was about 1,900mW/cm2. After one week, the surface hardnesses of both the top and the bottom of the resin samples were measured with a microhardness tester(MXT70, Matsuzawa, Japan). There ware significant differences in the hardness between the top and the bottom of the resin samples except the 2mm thickness samples cured by halogen light for 40s or by plasma light for 9s. There was no significant difference between the hardness values of the top surfaces of the thickness groups. The hardness values of the bottom surfaces decreased as the curing time decreased and as the thickness of resin samples increased, and the three kinds of resin composites showed similar patters. The results suggest that the halogen light for 40 seconds might be able to cure greater depth of resin composites than the plasma light far 3, 6, or 9 seconds.

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Plasma;Halogen;Light-curing;Composite resin;Surface hardness

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