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INFLUENCE OF TIP DISTANCE ON DEGREE OF CONVERSION OF COMPOSITE RESIN IN CURING WITH VARIOUS LIGHT SOURCES

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Abstract

ÃÖ±Ù¿¡ ¼Ò°³µÈ single high-intensity LED ÁßÇÕ±â´Â ÀÌÀüÀÇ LED ÁßÇձ⿡ ºñÇØ ³ôÀº ±¤µµ¸¦ °¡Áö¸ç ªÀº ÁßÇս𣿡 ÀûÀýÇÑ ¹°¼ºÀ» °¡Áú ¼ö ÀÖ´Ù°í ÇÑ´Ù. º» ¿¬±¸´Â single high-intensity LED ÁßÇÕ±âÀÇ ÁßÇÕ¼º´ÉÀ» Æò°¡Çϱâ À§ÇÏ¿© °Å¸®¿¡ µû¸¥ ÁßÇÕµµ¸¦ Á¶»çÇÏ¿´´Ù
Mylar strip »çÀÌ¿¡ º¹ÇÕ·¹Áø(Filtek Z250)À» ÅÐ°í ¾ÐÁ¢½ÃÄÑ ¸¸µç ¾ãÀº Çʸ§Çü ½ÃÆíÀ» LED ÁßÇÕ±â(Elipar Freelight 2, 10ÃÊ), Çö󽺸¶ ÁßÇÕ±â(Flipo, 6ÃÊ)¿Í ÇÒ·Î°Õ ÁßÇÕ±â(XL3000, 20ÃÊ)¸¦ »ç¿ëÇØ 0mm, 2mm, 4mm, 6mm¿¡¼­ ±¤µµ¸¦ ÃøÁ¤ÇÏ°í ÁßÇÕ½ÃÄ×´Ù. ÁßÇÕµÈ ½ÃÆíÀ» Fourier Transform Infrared Spectrometer(FTIR)¸¦ ÀÌ¿ëÇØ ÁßÇÕµµ¸¦ ÃøÁ¤ÇÑ ÈÄ ´ÙÀ½°ú °°Àº °á·ÐÀ» ¾ò¾ú´Ù.
1. ¸ðµç ÁßÇձ⿡¼­ °Å¸®°¡ Áõ°¡ÇÒ¼ö·Ï À¯ÀÇÇÏ°Ô ±¤µµ°¡ °¨¼ÒÇÏ¿´À¸¸ç LED ÁßÇÕ±âÀÇ °æ¿ì 6mm¿¡¼­ ´Ù¸¥ ÁßÇձ⿡ ºñÇØ °¡Àå ¸¹Àº ±¤µµ °¨¼ÒÀ²À» º¸¿´´Ù(p<0.05).
2. ¸ðµç ÁßÇձ⿡¼­ °Å¸®°¡ Áõ°¡ÇÔ¿¡ µû¶ó 4mm±îÁö´Â ÁßÇÕµµ°¡ °¨¼ÒÇÏ¿´Áö¸¸ À¯ÀÇÇÑ Â÷ÀÌ´Â º¸ÀÌÁö ¾Ê¾Ò´Ù(p>0.05) ÇÏÁö¸¸ 4mm¿Í 6mm»çÀÌ¿¡¼­´Â ¸ðµç ÁßÇձ⿡¼­ À¯ÀÇÇÏ°Ô °¨¼ÒÇÏ¿´´Ù(p<0.05).
3. °¢ °Å¸®¿¡ µû¸¥ ÁßÇձⰣÀÇ ÁßÇÕµµ Â÷ÀÌ´Â Omm, 2mm, 4mm¿¡¼­ LED ÁßÇձⰡ ´Ù¸¥ ÁßÇձ⺸´Ù À¯ÀÇÇÏ°Ô ³ôÀº ÁßÇÕµµ¸¦ º¸¿´À¸¸ç(p<0.05) Çö󽺸¶ ÁßÇÕ±â¿Í ÇÒ·Î°Õ ÁßÇձ⠻çÀÌ¿¡¼­´Â À¯ÀÇÇÑ Â÷ÀÌ°¡ ¾ø¾ú´Ù. ÇÏÁö¸¸ 6mm¿¡¼­´Â ¸ðµç ÁßÇձ⠻çÀÌ¿¡ À¯ÀÇÇÑ Â÷À̸¦ º¸ÀÌÁö ¾Ê¾Ò´Ù(p>0.05).
Recently, newly developed single high-intensity LED curing lights for composite resins are claimed to have a higher intensity than previous LED curing lights and to results in optimal properties and short curing time.
The purpose of this study was to determine the curing effectiveness of the curing units and to evaluate the re¡þlationship between the degree of polymerization and distance from curing light tip end to resin surface.
One composite resin was tested(Filtek Z250). Thin film specimens were cured with a LED curing unit(Elipar Freelight 2, 10s), Plasma Arc curing unit(Flipo, 6s), Halogen curing light(XL3000, 20s) at four curing light tip to the resin surface(O mm, 2mm, 4mm, 6mm). Degree of conversion of composite resins were determined by a Fourier Transform Infrared Spectrometer(FTIR).
From the present study, the following results were obtained.
1. In all curing units, relative light intensity was significantly decreased according to the increase of distance of light tip to the resin surface(p(0.05). LED curing units showed a higher percentile decrease in intensity than other curing units.
2. In all curing units, degree of conversion was decreased as increase of the distance but no statistically signif¡þicant difference(p)O.05) except between 4mm and 6mm(p(O.05).
3. When comparing degree of conversion of light curing units at each distance(Omm, 2mm, 4mm, 6mm), LED curing light had a higher degree of conversion than plasma arc and halogen curing lights at 0, 2, 4mm(p(O.05). At 6mm, there was a no significant difference among the curing units(p)0.05).

Å°¿öµå

LED ÁßÇÕ±â;Çö󽺸¶ ÁßÇÕ±â;°Å¸®;ÁßÇÕµµ;FTIR;±¤µµ;LED curing light;Plasma Arc curing light;Distance;Degree of conversion;FTIR;Light intensity

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