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Effect of 457 nm light on the polymerization of dental composite resins

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±Ç¿ëÈÆ ( Kwon Yong-Hoon ) - ºÎ»ê´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úÀç·áÇб³½Ç

Abstract

º» ¿¬±¸´Â 457 nmÀÇ ºûÀÌ º¹ÇÕ·¹ÁøÀÇ ÁßÇÕ¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» Æò°¡ÇÑ °ÍÀÌ´Ù. À̸¦ À§ÇÏ¿© ÆÄÀåÀÌ 457 nmÀÎ ·¹ÀÌÀú¿Í LED¸¦ ±¤¿øÀ¸·Î ±×¸®°í 6Á¾ÀÇ º¹ÇÕ·¹ÁøÀ» ½Ã·á·Î ¼±ÅÃÇÏ¿´´Ù. ±¤ ¼¼±â´Â ·¹ÀÌÀú¿Í LED ±¤Á¶»ç±â°¡ °¢°¢ 530 mW/cm2°ú 900 mW/§² À̾ú°í ±¤ Á¶»çµÈ ½Ã·áÀÇ ¹Ì¼¼°æµµ¿Í ÁßÇÕµµ¸¦ Æò°¡ÇÏ¿´´Ù. ±× °á°ú ½Ã·áÀÇ ÁßÇÕµµ´Â µÎ ±¤¿ø¿¡ ´ëÇؼ­ ºñ½ÁÇÏ¿´´Ù (À­¸é¿¡¼­ °¢°¢ 54.4-67.7%¿Í 55.2-67.1% À̾ú°í, ¹Ù´Ú¸é¿¡¼­ °¢°¢ 35.1-53.8%¿Í 45.4-53.1% À̾ú´Ù). ¹Ì¼¼°æµµ´Â ±âº»ÀûÀ¸·Î µÎ ±¤¿ø¿¡¼­ ºñ½ÁÇÏ¿´´Ù(À­¸é¿¡¼­ °¢°¢ 28.5-83.6 Hv¿Í 19.1-82.4 Hv À̾ú°í, ¹Ù´Ú¸é¿¡¼­ °¢°¢ 22.5-65.4 Hv¿Í 16.8-74.4 Hv À̾ú´Ù). ±×·¯³ª ¾î¶² ½Ã·á´Â ¹Ù´Ú¸é¿¡¼­ ·¹ÀÌÀú·Î ±¤Á¶»çµÈ °æ¿ì°¡ LED·Î ±¤Á¶»çµÈ °æ¿ìº¸´Ù ¾à°£ ³·Àº ¹Ì¼¼°æµµ°ª (28.5-65.4 Hv vs 47.2-74.4 Hv)À» º¸¿´´Ù. º» °á°ú´Â 457 nmÀÇ ºûÀÌ º¹ÇÕ·¹ÁøÀ» LEDÀÇ °æ¿ì¿Í ºñ½ÁÇÑ ¼öÁØÀ¸·Î ±¤ÁßÇÕ ÇÒ ¼ö ÀÖÀ½À» ½Ã»çÇÑ´Ù.

The aim of this study was to determine if a 457 nm blue laser could effectively polymerize dental composite resins. After light curing 6 dental composite resins using a laser or a LED light-curing unit at 530 mW/§² and 900 mW/c§², respectively, degree of conversion and microhardness were evaluated. Degree of conversion of specimens by the laser and LED was similar (on top surface 54.4-67.7% and 55.2-67.1%, respectively; on bottom surface 35.1-53.8% and 45.4-53.1%, respectively). Microhardness was also similar (on top surface 28.5-83.6 Hv and 19.1-82.4 Hv, respectively; on bottom surface 22.5-65.4 Hv and 16.8-74.4 Hv, respectively), although, in some cases, laser-treated specimens showed slightly lower microhardness than the LED-treated on bottom surface. The present study shows that the 457 nm laser can polymerize dental composite resins to the same level as LED achieved.

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Composite resin; Laser; Microhardness; Degree of conversion

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