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POLYMERIZATION SHRINKAGE KINETICS OF SILORANE-BASED COMPOSITES

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Abstract

º¹ÇÕ·¹ÁøÀÌ °³¹ßµÈ ÀÌÈÄ ¸¹Àº ¹°¼ºÀÇ Çâ»óÀÌ ÀÌ·ç¾îÁ³À¸³ª º¹ÇÕ·¹ÁøÀÇ ÁßÇÕ¼öÃàÀº ¾ÆÁ÷ ÇØ°áµÇÁö ¾ÊÀº ÁÖ¿ä ´ÜÁ¡À¸·Î ³²¾ÆÀÖ´Ù. ÁßÇÕ¼öÃàÀÌ ÀûÀº º¹ÇÕ·¹ÁøÀ» ¸¸µé±â À§ÇÑ ¸¹Àº ³ë·ÂÀÌ ÀÌ·ç¾îÁ³°í, ÃÖ±Ù¿¡ ±âÁ¸ÀÇ methacrylate ±âÁúÀÌ ¾Æ´Ñ silorane ±âÁúÀÇ º¹ÇÕ·¹ÁøÀÌ °³¹ßµÇ¾ú´Ù. º» ¿¬±¸¿¡¼­´Â silorane ±âÁúÀÇ º¹ÇÕ·¹Áø°ú methacrylate ±âÁúÀÇ º¹ÇÕ·¹ÁøÀÇ ÁßÇÕ¼öÃà°Åµ¿À» ÃøÁ¤ÇÏ°í ºñ±³ÇÏ°íÀÚ ÇÏ¿´´Ù. ¿Âµµº¯È­¿¡ ¹Î°¨ÇÏÁö ¾ÊÀ¸¸ç ½Ç½Ã°£À¸·Î º¹ÇÕ·¹ÁøÀÇ Ã¼Àû ÁßÇÕ¼öÃàÀ» ÃøÁ¤ÇÒ ¼ö ÀÖ´Â °èÃøÀåÄ¡¸¦ Á¦ÀÛÇÏ¿© »ç¿ëÇÏ¿´´Ù. 5Á¾ÀÇ methacrylate ±âÁúÀÇ ¼öº¹¿ë º¹ÇÕ·¹Áø(Beautifil, Z100, Z250, Z350, Gradia X)°ú silorane ±âÁú º¹ÇÕ·¹Áø(P90)ÀÇ ÁßÇÕ¼öÃàÀ» 10ºÐ µ¿¾È ÃøÁ¤ÇÏ¿©, ÁßÇÕ¼öÃà·®, ÃÖ´ë ÁßÇÕ¼öÃà·ü ±×¸®°í ÃÖ´ë¼öÃà½Ã°£À» ºñ±³ÇÏ¿´´Ù. º¹ÇÕ·¹ÁøÀÇ ÁßÇÕ¼öÃàÀº Á¦Ç°º°·Î ¸¹Àº Â÷À̸¦ º¸¿´´Ù. Silorane ±âÁúÀÇ P90 º¹ÇÕ·¹ÁøÀÇ ÁßÇÕ¼öÃàÀÌ 1.48%·Î °¡Àå ³·¾Ò°í Beautifil º¹ÇÕ·¹ÁøÀÇ ÁßÇÕ¼öÃàÀÌ 2.80%·Î °¡Àå ³ô¾Ò´Ù. Methacrylate °è¿­ÀÇ º¹ÇÕ·¹Áø »çÀÌ¿¡µµ ÁßÇÕ¼öÃà·®¿¡ Á¦Ç°º°·Î À¯ÀÇÇÑ Â÷À̸¦ º¸¿´´Ù(p < 0.05). ÃÖ´ë ÁßÇÕ¼öÃà·üÀº P90ÀÌ 0.13%/s·Î °¡Àå ³·¾Ò°í Z100ÀÌ 0.34%/s·Î °¡Àå ³ô¾Ò´Ù. ÃÖ´ë ¼öÃà½Ã°£Àº methacrylate ±âÁúÀÇ º¹ÇÕ·¹Áø(2.4-3.1ÃÊ)¿¡ ºñÇØ, silorane ±âÁúÀÇ P90 º¹ÇÕ·¹ÁøÀÌ 6.7ÃÊ·Î µÎ ¹è ÀÌ»ó ±æ¾ú´Ù. ÃÖ´ëÁßÇÕ¼öÃà·üÀº ÁßÇÕ¼öÃà°ú ÃÖ´ë¼öÃà½Ã°£ÀÇ ¿ª¼ö¸¦ °öÇÑ °ª°ú °­ÇÑ ¾çÀÇ »ó°ü°ü°è¸¦ º¸¿´´Ù(R = 0.95).

Dental composites have improved significantly in physical properties over the past few decades. However, polymerization shrinkage and stress is still the major drawback of composites, limiting its use to selected cases. Much effort has been made to make low shrinking composites to overcome this issue and siloranebased composites have recently been introduced into the market. The aim of this study was to measure the volumetric polymerization shrinkage kinetics of a siloranebased composite and compare it with conventional methacrylate-based composites in order to evaluate its effectiveness in reducing polymerization shrinkage. Five commercial methacrylate-based (Beautifil, Z100, Z250, Z350 and Gradia X) and a silorane-based(P90) composites were investigated. The volumetric change of the composites during light polymerization was detected continuously as buoyancy change in distilled water by means of Archemedes¡¯principle, using a newly made volume shrinkage measurement instrument. The null hypothesis was that there were no differences in polymerization shrinkage, peak polymerization shrinkage rate and peak shrinkage time between the silorane-based composite and methacrylate-based composites. The results were as follows: 1. The shrinkage of silorane-based (P90) composites was the lowest (1.48%), and that of Beautifil composite was the highest (2.80%). There were also significant differences between brands among the methacrylate-based composites. 2. Peak polymerization shrinkage rate was the lowest in P90 (0.13%/s) and the highest in Z100 (0.34%/s). 3. The time to reach peak shrinkage rate of the silorane-based composite (P90) was longer (6.7 s) than those of the methacrylate-based composites (2.4-3.1 s). 4. Peak shrinkage rate showed a strong positive correlation with the product of polymerization shrinkage and the inverse of peak shrinkage time (R = 0.95). [J Kor Acad Cons Dent 35(1):51-58, 2010]

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Silorane;º¹ÇÕ·¹Áø;ÁßÇÕ¼öÃà·®;ÃÖ´ëÁßÇÕ¼öÃà·ü;ÃÖ´ë¼öÃà½Ã°£;¾Æ¸£Å°¸Þµ¥½º ¿ø¸®;ºÎ·Â
Silorane;Composites;Polymerization shrinkage;Peak polymerization shrinkage rate;Peak shrinkage time;Archemede¡¯principle;Buoyancy -Received 2010.1.10.; revised 2010.1.13.; accepted 2010.1.14.-

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