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EFFECT OF FIBER DIRECTION ON THE POLYMERIZATION SHRINKAGE OF FIBER-REINFORCED COMPOSITES

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¿°Áß¿ø ( Yom Joong-Won ) - ¼­¿ï´ëÇб³ Ä¡ÀÇÇдëÇпø Ä¡°úº¸Á¸Çб³½Ç
ÀÌÀκ¹ ( Lee In-Bog ) - ¼­¿ï´ëÇб³ Ä¡ÀÇÇдëÇпø Ä¡°úº¸Á¸Çб³½Ç

Abstract

º» ¿¬±¸ÀÇ ¸ñÀûÀº strain gage¿Í LVDT (linear variable differential transformer) º¯À§¼¾¼­¸¦ ÀÌ¿ëÇÏ¿© ¼¶À¯ º¸°­ º¹ÇÕ·¹Áø¿¡¼­ ¼¶À¯ÀÇ ¹æÇâÀÌ º¹ÇÕ·¹ÁøÀÇ ÁßÇÕ¼öÃà¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» ¾Ë¾Æº¸±â À§ÇÔÀÌ´Ù. Áö¸§ 10 mm, ³ôÀÌ 2 mmÀÇ ¿ø¹Ý ¸ð¾ç À¯µ¿¼º º¹ÇÕ·¹Áø (Aeliteflo A2, Bisco, Inc., IL, USA) Áß¾Ó¿¡ À¯¸®¼¶À¯ (X-80821P Glass Fiber, Bisco, Inc., IL, USA)¸¦ À§Ä¡½ÃÅ°°í, ¼¶À¯°¡ ¹è¿­µÈ ÀåÃà ¹æÇâ (longitudinal)°ú ¼öÁ÷¹æÇâ (transversal)ÀÇ ÁßÇÕ¼öÃà·®À» strain gage (Linear S-series 350¥Ø, CAS, Seoul, Korea)¸¦ ÀÌ¿ëÇÏ¿© °¢°¢ ÃøÁ¤ÇÏ¿´´Ù. »ç¿ëµÈ À¯µ¿¼º º¹ÇÕ·¹Áø ÀÚüÀÇ free ÁßÇÕ¼öÃàÀ» ±¸Çϱâ À§ÇØ Áö¸§ 7 mm, ³ôÀÌ 1 mmÀÇ ¿ø¹Ý ¸ð¾ç ½ÃÆíÀÇ ¼öÁ÷¹æÇâ (axial) free ÁßÇÕ¼öÃà°ªÀ» LVDT·Î ÃøÁ¤ÇÏ¿´´Ù. ÁßÇÕµÈ ½ÃÆíµéÀ» Àý´ÜÇÏ¿© ÁÖ»çÀüÀÚÇö¹Ì°æÀ¸·Î º¹ÇÕ ·¹Áø ³»ºÎ ÀÇ ¼¶À¯¹è¿­À» °üÂûÇÏ°í °¢ ±º¿¡¼­ ÃøÁ¤µÈ Æò±Õ ¼öÃà°ªµéÀ» ANOVA·Î ºñ±³ÇÏ¿´°í Scheffe post-hoc test·Î »çÈÄ °ËÁ¤ÇÏ¿´´Ù (¥á=0.05). ¼¶À¯°¡ ¹è¿­µÈ Æò¸é »ó¿¡¼­ º¹ÇÕ·¹ÁøÀÇ ÁßÇÕ¼öÃà (radial shrinkage)Àº ¼¶À¯¿Í ÆòÇàÇÑ ¹æÇâ¿¡¼­ °¨¼ÒÇÏ°í ¼¶À¯¿Í ¼öÁ÷ÇÑ ¹æÇâ¿¡¼­ Áõ°¡Çß´Ù (p<0.05). º» ¿¬±¸ÀÇ °á°ú ¼¶À¯ º¸°­ º¹ÇÕ·¹ÁøÀ¸·Î ½ºÇø°Æ®³ª ¼öº¹¹°À» Á¦ÀÛÇÒ ¶§ ÁßÇÕ¼öÃà·® Àº º¸°­µÈ ¼¶À¯ÀÇ ¹è¿­¹æÇâ¿¡ µû¶ó Å« Â÷ÀÌ°¡ ³²À» ¾Ë ¼ö ÀÖ¾ú´Ù.

The aim of this study was to evaluate the effect of fiber direction on the polymerization shrinkage of fiberreinforced composite. The disc-shaped flowable composite specimens (d = 10 mm, h = 2 mm, Aeliteflo A2, Bisco, Inc., IL, USA) with or without glass fiber bundle (X-80821P Glass Fiber, Bisco, Inc., IL, USA) inside were prepared, and the longitudinal and transversal polymerization shrinkage of the specimens on radial plane were measured with strain gages (Linear S-series 350¥Ø, CAS, Seoul, Korea). In order to measure the free polymerization shrinkage of the flowable composite itself, the disc-shaped specimens (d = 7mm, h = 1 mm) without fiber were prepared, and the axial shrinkage was measured with an LVDT (linear variable differential transformer) displacement sensor. The cross-section of the polymerized specimens was observed with a scanning electron microscope to examine the arrangement of the fiber bundle in composite. The mean polymerization shrinkage value of each specimen group was analyzed with ANOVA and Scheffe post-hoc test (¥á=0.05). The radial polymerization shrinkage of fiber-reinforced composite was decreased in the longitudinal direction of fiber, but increased in the transversal direction of fiber (p<0.05). We can conclude that the polymerization shrinkage of fiber-reinforced composite splint or restoratives is dependent on the direction of fiber.

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fiber-reinforced composite;longitudinal direction;transversal direction;polymerization shrinkage;strain gage;linear variable differential transformer

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