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Real time measurement of the transmittance change of composite during light curing

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¿ÀÇöÁø, ÃÖ°í¿î, ÀÌâÇÏ, ÀÓ¹ü¼ø, ÀÌÀκ¹,
¼Ò¼Ó »ó¼¼Á¤º¸
¿ÀÇöÁø ( Oh Hyun-Jin ) - Seoul National University School of Dentistry Department of Conservative Dentistry
ÃÖ°í¿î ( Choi Go-Woon ) - Seoul National University School of Dentistry Department of Conservative Dentistry
ÀÌâÇÏ ( Lee Chang-Ha ) - Seoul National University Dental Hospital One-Stop Specialty Center
ÀÓ¹ü¼ø ( Lim Bum-Soon ) - Seoul National University School of Dentistry Department of Dental Biomaterials Science
ÀÌÀκ¹ ( Lee In-Bog ) - Seoul National University School of Dentistry Department of Conservative Dentistry

Abstract

º» ¿¬±¸´Â º¹ÇÕ·¹ÁøÀÇ ±¤ÁßÇÕ Àü°ú ÈÄÀÇ Åõ°úµµ º¯È­¸¦ ½Ç½Ã°£À¸·Î ÃøÁ¤ÇÏ¿© º¹ÇÕ·¹ÁøÀÇ »ö»ó ¹× µÎ²²¿¡ µû¸¥ º¯È­¸¦ °üÂûÇÏ°íÀÚ ÇÏ¿´´Ù. ÆÞ½º Æø º¯Á¶(pulse width modulation) ±¤Á¶»ç±â¸¦ ÀÌ¿ëÇØ ½Ç½Ã°£À¸·Î º¹ÇÕ·¹ÁøÀÇ Åõ°úµµ¸¦ ÃøÁ¤ÇÒ ¼ö ÀÖ´Â ÀåÄ¡¸¦ Á¦ÀÛÇÏ¿© ½ÇÇè¿¡ ÀÌ¿ëÇÏ¿´À¸¸ç, ¹Ì¼¼È¥ÇÕÇü Filtek Z250 º¹ÇÕ·¹ÁøÀÇ5°¡Áö »ö»ó(A1, A2, A3, A3.5, A4)¿¡ µû¸¥ Åõ°úµµ¿Í 4°¡Áö µÎ²²(0.16, 0.50, 1.0, 1.5 mm)¿¡ µû¸¥ Åõ°úµµ¸¦ ½Ç½Ã°£À¸·Î ÃøÁ¤ÇÏ¿´´Ù. Åõ°úµµ º¯È­À²ÀÇ ÃÖ´ë°ª°ú peak timeÀ¸·Î ÁßÇÕ¿ªÇÐÀ» °üÂûÇÏ¿´°í, ÁßÇÕ Àü°ú ÈÄÀÇ °¨¼è»ó¼ö¸¦ ºñ±³ÇÏ¿´´Ù. ÁßÇÕ ÈÄ ¸ðµç ½ÃÆí¿¡¼­ Åõ°úµµ°¡ Áõ°¡Çß´Ù. »ö»ó¿¡ µû¶ó¼­´Â ÁßÇÕ ÀüÈÄ ¸ðµÎ A2°¡ ÃÖ°í, A1ÀÌ ÃÖÀú Åõ°úµµ¸¦ ³ªÅ¸³Â´Ù. ÁßÇÕ Àü ÈÄ Åõ°úµµ º¯È­¿Í ÃÖ´ë º¯È­À²Àº A2°¡ ÃÖ°í, A3.5°¡ ÃÖÀú¿´À¸¸ç, peak timeÀº 3.10~4.07ÃÊ·Î »ö»óº°·Î À¯ÀÇÇÑ Â÷ÀÌ´Â ¾ø¾ú´Ù. ½ÃÆíÀÌ ¾ã¾ÆÁú¼ö·Ï Åõ°úµµ¿Í Åõ°úµµ º¯È­À² ¸ðµÎ Áõ°¡ÇßÀ¸¸ç, peak timeÀº 1.5 mm µÎ²²¿¡¼­ ÃÖ´ë¿´´Ù. °¨¼è»ó¼öÀÇ Àý´ë°ªÀº ¸ðµç ½ÃÆí¿¡¼­ ÁßÇÕ ÈÄ¿¡ °¨¼ÒÇß´Ù. °á·ÐÀûÀ¸·Î º¹ÇÕ·¹ÁøÀº ÁßÇÕ ÈÄ Åõ°úµµ°¡ Áõ°¡Çϴµ¥ »ö»ó¿¡ µû¶ó ÁßÇÕ Àü°ú ÈÄÀÇ Åõ°úµµ´Â ¸ðµÎ ´Ù¸¥ °ªÀ» º¸¿´°í, µÎ²²°¡ ¾ãÀ»¼ö·Ï Åõ°úµµ°¡ Áõ°¡ÇÏ¿´´Ù. ½Ã°£¿¡ µû¸¥ Åõ°úµµ º¯È­À²À» ÅëÇØ ÁßÇÕ¿ªÇÐ ¶ÇÇÑ °üÂûÇÒ ¼ö ÀÖ¾ú´Ù.

The purpose of this study was to measure the transmittance change of composites during light curing in real time according to different shades and thicknesses. An instrument using pulse width modulation-curing light was developed to measure the transmittance of composites in real time. A micro-hybrid composite, Filtek Z250, was used for %transmittance measurement with five different shades (A1, A2, A3, A3.5, A4) and 4 different thicknesses (0.16, 0.5, 1.0, 1.5 mm). The maximum value of d (%Transmittance)/ d t and peak time were used to observe polymerization kinetics. Attenuation coefficient was also compared between pre and post cured specimens. The transmittance increased in all specimens after polymerization. A2 showed the highest and A1 showed the lowest transmittance in both pre and post curing. The transmittance change and maximum rate of change were highest in A2 and lowest in A3.5, and the peak time, which ranged in 3.10 to 4.07, was not significantly different among shades. As the specimen became thinner, both the transmittance and rate of change increased, and the peak time was maximum at 1.5 mm thickness. The absolute value of attenuation coefficient decreased after polymerization in all specimens. In conclusion, the transmittance of composite increased after polymerization. Each shade showed different transmittance value for both pre and post curing state, and thinner specimen showed higher transmittance value. Polymerization kinetics could also be observed through the rate of transmittance change over time.

Å°¿öµå

°¨¼è°è¼ö; º¹ÇÕ·¹Áø; Åõ°úµµ; ±¤ÁßÇÕ; ÁßÇÕ¿ªÇÐ
Attenuation coefficient; Composites; Light curing; Polymerization kinetics; Transmittance

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