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Influence of resin-nanoceramic CAD/CAM block shade and thickness on the microhardness of dual-cured resin cement

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Áø¸í¿í ( Jin Myoung-Uk ) - °æºÏ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç
±Ç¿ëÈÆ ( Kwon Yong-Hoon ) - ºÎ»ê´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úÀç·áÇб³½Ç
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Abstract

º» ¿¬±¸¿¡¼­´Â ´Ù¾çÇÑ µÎ²²¿Í »öÁ¶¸¦ °¡Áø ·¹Áø ?³ª³ë¼¼¶ó¹Í CAD-CAM block(RNB)ÀÇ ½ÃÆíÀ» ÀÌ¿ëÇÏ¿© ±¤ÁßÇÕ ½Ã ½ÃÆíÀ» Åõ°úÇÏ´Â ±¤ÀÚÀÇ ¼ö¿Í ½ÃÆíÀ» Åë°úÇÏ´Â ºûÀÇ ¾ç¿¡ ¿µÇâÀ» ¹ÌÄ¥ ¼ö ÀÖ´Â ¹ÝÅõ¸íµµ Áö¼ö¸¦ ÃøÁ¤ÇÏ°í, ½ÃÆí ÇϹæÀÇ ÀÌ¿øÁßÇÕ ·¹Áø½Ã¸àÆ®ÀÇ ¹Ì¼¼°æµµ ÃøÁ¤À» ÅëÇØ ±× ÁßÇÕÀû Ư¼ºÀ» ÆľÇÇÏ¿´´Ù. Lava Ultimate (3M/ESPE, St. Paul, MN, USA) ¼¼¶ó¹Í ½ÃÆíÀ» A1, A2, A3»öÁ¶ (HT (high translucency)¿Í LT (low translucency))·Î °¢°¢ 1, 2, 3, 4 mm µÎ²²·Î Á¦ÀÛÇÏ¿´´Ù (n = 3). Photodiode detector (M1420, EG&G PARC, Princeton, NJ, U.S.A.)¸¦ ÅëÇØ ½ÃÆíÀ» Åë°úÇÏ´Â ±¤ÀÚÀÇ ¼ö¸¦ ÃøÁ¤ÇÏ¿´°í spectrophotometer (SpectroPro-500, Acton Research, Acton, MA, U.S.A.)¸¦ ÀÌ¿ëÇÏ¿© ½ÃÆíÀÇ ¹ÝÅõ¸íµµ Áö¼ö¸¦ ÃøÁ¤ÇÏ¿´´Ù. Stainless steel mold (6 mm Á÷°æ, 1 mm µÎ²²)¸¦ Á¦ÀÛÇÏ¿© ÀÌ¿øÁßÇÕ ·¹Áø½Ã¸àÆ® (Rely X ARC, 3M/ESPE, St. Paul, MN, USA)¸¦ Á¦Á¶»çÀÇ Áö½Ã´ë·Î Á¶ÀÛÇÏ¿© Àû¿ë ÈÄ Mylar strip¸¦ ¾ñÀº µÚ ÁÖÀÔµÈ ·¹Áø½Ã¸àÆ®°¡ ¿ÏÀüÈ÷ µ¤ÀÏ ¼ö ÀÖµµ·Ï °¢ ½ÇÇ豺ÀÇ ½ÃÆíÀ» À§Ä¡½ÃÅ°°í ±¤Á¶»ç±â·Î 40ÃÊ°£ ±¤ÁßÇÕ ÇÏ¿´´Ù. ÀÌÈÄ 24½Ã°£ µ¿¾È 37¡ÆC¿¡ º¸°ü ÈÄ ¹Ì¼¼°æµµ¸¦ ÃøÁ¤ÇÏ¿´´Ù.
±¤ÀÚÀÇ ¼ö´Â HT, LT±º¿¡¼­ ¸ðµÎ ¼¼¶ó¹Í ½ÃÆíÀÇ µÎ²²°¡ Áõ°¡ÇÔ¿¡ µû¶ó À¯ÀÇÇÏ°Ô °¨¼ÒÇÏ¿´°í, A1 ±ºÀÌ A2±º°ú A3±º¿¡ ºñÇØ À¯ÀÇÇÏ°Ô ÀûÀº °¨¼Ò¸¦ º¸¿´´Ù (p<0.05). ¹ÝÅõ¸íµµ Áö¼ö´Â HT, LT ±×·ì¿¡¼­ ½ÃÆíÀÇ µÎ²²°¡ Áõ°¡ÇÔ¿¡ µû¶ó À¯ÀÇÇÏ°Ô °¨¼ÒÇÏ¿´°í A1±ºÀÌ A2±º°ú A3±º¿¡ ºñÇØ ³ôÀº °ªÀ» ³ªÅ¸³Â´Ù (p<0.05). HT, LT±×·ì °¢°¢ µÎ²²°¡ Áõ°¡ÇÔ¿¡ µû¶ó, »öÁ¶°¡ Áõ°¡ÇÔ¿¡ µû¶ó ¹Ì¼¼°æµµ´Â °¨¼ÒÇÏ¿´À¸¸ç, 1 mm±º°ú 4 mm±º, ±×¸®°í A1±º°ú A3±º¿¡¼­´Â Åë°èÀûÀ¸·Î À¯ÀÇÇÏ°Ô °¨¼ÒÇÏ¿´´Ù (p<0.05).

The purpose of this study was to examine the effect of shade and thickness of resin-nanoceramic CAD-CAM block (RNB) on the microhardness of dual-cured resin cement, as well as to measure the number of photons transmitted through RNBs of different thicknesses and colors. One dual-cured resin cement was used to prepare resin cement specimens. Resin cement specimens were light-cured for 40 seconds through 3 shades (A1, A2, A3 in HT (high translucency) and LT (low translucency) respectively) and four thicknesses (1, 2, 3, 4 mm) of RNB specimens. Vickers microhardness measurements of resin cement specimens were performed using a Vickers hardness tester. The light transmission of RNB specimens was measured using a spectrometer (SpectroPro-500, Acton Research, Acton, MA, U.S.A.), and the translucency parameter was calculated using the CIEL*a*b* system. Data were statistically analyzed by ANOVA and Tukey?s test. There was a significant decrease of microhardness of resin cement specimen with an overlay of 4 mm of RNB thickness and A3 shade in comparison to A1 and 1 mm, respectively (p<0.05). The translucency parameter values and light transmission of RNBs tested differed significantly, according to the thicknesses of the specimen (p<0.05). Light transmission is decreased with increase in the thicknesses of RNBs. Shade A1 transmitted more light than darker blocks. A decrease in microhardness of resin cement specimens was observed with increasing thickness and shade (A1 to A3) of RNBs.

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Resin-nanoceramic CAD/CAM blocks; Dual-cured resin cement; Microhardness

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