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Flexural Properties according to Change of Polymerization Temperature of Autopolymerized Resin for Orthodontic

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À̱Լ± ( Lee Gyu-Sun ) - µ¿³²º¸°Ç´ëÇб³ Ä¡±â°ø°ú

Abstract

Ä¡°ú ±³Á¤¿ë ÀÚ°¡ÁßÇÕÇü ·¹ÁøÀÇ ÁßÇÕ ¿Âµµ°¡ ±â°èÀû Ư¼º¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» ¾Ë¾Æº¸±â À§ÇÏ¿© Æú¸®¸Ó¿Í ¸ð³ë¸ÓÀÇ ºÎÇǺñ´Â 2.5:1·Î ÇÏ°í, ÁßÇÕ ¿Âµµ¸¦ 25¡É, 40¡É, 70¡ÉÀÇ ¼¼groupÀ¸·Î ³ª´©¾ú´Ù. ½ÇÇèÀ» À§ÇØ °¢ group ´ç 10°³¾¿ÀÇ ½ÃÆíÀ» ÁßÇÕ ½Ã°£ 15 ºÐ, ÁßÇÕ ¾Ð·Â 3 bar·Î ÅëÀÏÇÏ¿© Á¦ÀÛÇÏ¿´´Ù. ±× ÈÄ ½ÃÆíÀ» ½ÇÇè Àü±îÁö 37¡ÉÀÇ Áõ·ù¼ö¿¡ 48½Ã°£ À̻󺸰üÇÑ ´ÙÀ½, Intron (3344)À» ÀÌ¿ëÇÏ¿© °¢ ½ÃÆíÀÇ FS ¹×EMÀ» ÃøÁ¤ÇÏ¿´´Ù. ÀÌ·¸°Ô ÇÏ¿© ¾ò¾îÁø °ªµéÀº SPSS ver. 16.0À» »ç¿ëÇÏ¿©ÀÏ¿ø ¹èÄ¡ ºÐ»ê ºÐ¼®À» ÇÏ¿´À¸¸ç ScheffeÀÇ »çÈÄ °ËÁ¤À» ½Ç½ÃÇÏ¿© ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù. Ä¡°ú ±³Á¤¿ë ÀÚ°¡ÁßÇÕÇü ·¹ÁøÀÇ FS Æò±Õ°ªÀ» ºñ±³ÇØ º¸¾ÒÀ» ¶§ 25¡É groupÀº 71.500¡¾5.546 MPa, 40¡É groupÀº74.920¡¾4.237 MPa, 70¡É groupÀº 76.880¡¾4.304 MPaÀǹüÀ§¿´À¸¸ç, 25¡É group£¼40¡É group£¼70¡É group ¼øÀ¸·Î Â÷ÀÌ°¡ ÀÖ¾úÀ¸³ª Åë°èÀûÀ¸·Î À¯ÀÇÇÑ Â÷ÀÌ´Â ¾ø¾ú´Ù(p=0.052). Ä¡°ú ±³Á¤¿ë ÀÚ°¡ÁßÇÕÇü ·¹ÁøÀÇ EM Æò±Õ°ªÀº 25¡É groupÀÌ 2.164¡¾0.073 GPa, 40¡É groupÀº 2.258¡¾0.069 GPa, 70¡É groupÀº 2.282¡¾0.147 GPaÀÇ ¹üÀ§¿´À¸¸ç, 25¡É group£¼40¡É group£¼70¡É group ¼øÀ¸·Î ÁßÇÕ ¿Âµµ°¡ ³ôÀ»¼ö·Ï À¯ÀÇÇÑ Â÷À̸¦ º¸¿´´Ù(p£¼0.039). ÀÌ»óÀÇ ½ÇÇè °á°ú·Î ¹Ì·ç¾î º¼ ¶§ EM °ªÀº 25¡É group £¼40¡É group£¼70¡É group ¼øÀ¸·Î Åë°èÀû À¯ÀǼºÀÌ ÀÎÁ¤µÇ´Â ¼öÁØÀÇ »ó½ÂÀÌ ÀÖ¾ú´ø ¹Ý¸é, FS °ªÀº Åë°èÀû À¯ÀǼºÀºº¸ÀÌ°í ÀÖÁö ¾ÊÀ¸³ª °­µµÀÇ Áõ°¡¿¡ ¿µÇâÀ» ¹ÌÄ¡°í ÀÖÀ¸¹Ç·Î, Ä¡°ú ±³Á¤ ÀåÄ¡ Á¦ÀÛ ½Ã ÀÏÁ¤ ¼öÁØÀÇ ÁßÇÕ ¿Âµµ »ó½ÂÀºÀåÄ¡ÀÇ ±â°èÀû ¹°¼ºÀ» Áõ°¡½Ãų °ÍÀ̶ó°í ÆǴܵȴÙ.

For this experiment, specimen was manufactured by injecting polymer and monomer into silicon mold with volume ratio of 2.5:1 based on ISO 20795-2 so that average thickness, width and length of specimen would be maintained as 3.3 mm, 10.0 mm and 65.0 mm, respectively depending on spray on technique. Specimen was divided into 3 groups (25¡É, 40¡É, 70¡É) depending on polymerization temperature and 10 specimen was manufactured for each group and it was polymerized in water tank of ¡¾1oC under the setting condition of polymerization time of 15 minutes and pressure of 3 bar. After keeping specimen in distilled water of 37¡É for over 48 hours before experiment, flexural strength (FS) and elasticity modulus (EM) of specimen being tested by using Intron (3344; Instron; Instron). SPSS ver. 16.0 was used for analysis and post-hoc test of Scheffe was performed after using one-way ANOVA. When comparing mean value of FS of resin for orthodontics, it was represented in the range of 71.500 MPa for 25¡É group, 74.920 MPa for 40¡É group and 76.880 MPa for 70¡É group and difference was shown in the order of 25¡É group £¼40¡É group £¼70¡É group but such difference was not significant statistically (p=0.052). Result of EM mean value of resin for orthodontics was more polymerization temperature was high, the more was significant difference represented in the order of 25¡É group £¼40¡É group £¼70¡É group (p £¼0.039).

Å°¿öµå

Autopolymerizing acrylic resin; Flexural strength; Polymerization temperature

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