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Flow properties of thermoplasticized Gutta Percha obturation materials

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¹é¸íÇö ( Baek Myong-Hyun ) - ¸ÞŸ¹ÙÀÌ¿À¸Þµå ±â¼ú¿¬±¸¼Ò
¼ÛºÎ¼® ( Song Bu-Seok ) - ¸ÞŸ¹ÙÀÌ¿À¸Þµå ±â¼ú¿¬±¸¼Ò
ÃÖÀº¹Ì ( Choi Eun-Mi ) - °æµ¿´ëÇб³ Ä¡À§»ýÇаú

Abstract

º» ¿¬±¸ÀÇ ¸ñÀûÀº ¼­·Î ´Ù¸¥ ¿Âµµ ¼³Á¤À» ¹Þ¾ÒÀ» ¶§ ¿­°¡¼Ò¼º °¡Å¸ÆÛÂ÷ÀÇ È帧¼º Ư¼ºÀ» Æò°¡ Çغ¸°íÀÚ ÇöÀç ÀÓ»ó¿¡¼­ »ç¿ëµÇ´Â °¡Å¸ÆÛÂ÷ 4°³ Á¦Ç°À» ¿¬Áú, ÁßÁú, °æÁú·Î ºÐ·ùÇÏ¿© ½ÇÇèÇÏ¿´À¸¸ç, ½ÇÇè½ÃÆíÀº 24½Ã°£ µ¿¾È (23 ¡¾ 2) ¡É, (50 ¡¾ 5) % »ó´ë½Àµµ Á¶°ÇÀ¸·Î ÇÏ¿© ISO 1133-1:2011ÀÇ Á¦½Ã¿¡ µû¶ó ·¹¿À¹ÌÅÍ(Melt flow indexer MFI-10, DAVENPORT, England)·Î ÃøÁ¤Çß´Ù. °¡Å¸ÆÛÂ÷ Àç·áÀÇ ¿­È­ ¿Âµµ´Â 108¡É, 160¡É, 200¡ÉÀÇ ¿Âµµ·Î ÇÏ°í ÇÏÁßÀº 2.16 §¸, 3.8 §¸À¸·Î ¼³Á¤ÇßÀ¸¸ç ½ÃÆíÀº ·¹¿À¹ÌÅÍ °¡¾Ð°úÁ¤¿¡ ÀûÇÕÇϵµ·Ï ¾à 5 mm ´ÜÀ§·Î À߶úÀ¸¸ç, Preheating time 5 ºÐ, Cutting timeÀº 5~240ÃÊ, »ùÇÃÀº 10 g À¸·Î ÇÏ¿© ½ÇÇèÇÑ °á°ú 108¡É, 160¡ÉÀÇ ¿Âµµ¿¡¼­´Â È帧¼º ¼ºÁú¿¡ º¯È­°¡ ¾ø¾úÀ¸³ª 200¡É±îÁö ¿­È­Çϸé È帧¼º ¼ºÁúÀÌ º¯È­µÇ´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù. °¡¾Ð ÇÏÁßÀº 2.16 §¸°ú 3.8 §¸À¸·Î ÇÏ¿© ÃøÁ¤ÇÑ °á°ú ÇÏÁßÀº È帧¼º Ư¼º¿¡ ¿µÇâÀ» ¹ÌÄ¡Áö ¾Ê¾ÒÀ¸³ª ¿­°¡¼Ò¼º °¡Å¸ÆÛÂ÷ÀÇ È帧¼º ÃøÁ¤ÀÇ °æ¿ì ¿Âµµ¿Í Cut-off timeÀÇ ¼³Á¤ÀÌ ¸Å¿ì Áß¿äÇÑ °ÍÀ¸·Î Á¶»ç µÇ¾ú´Ù.

The purpose of this study is to evaluate the flow ability of the thermoplasticized Gutta Percha in different temperatures. Four Gutta Percha products were classified by its hardness (soft, medium, and hard) and were experimented by the Rheometer (Melt flow indexer MFI-10, DAVENPORT, England) measuring apparatus, in (23 ¡¾ 2) ¡É, and in a relative humidity of (50 ¡¾ 5)%, following the guidelines of ISO 1133-1:2011. The heating temperature ranged from 108¡É, 160¡É to 200¡É, and the load at 2.16 kg and 3.8 kg. The Gutta Percha was cut in 5 mm to be suitable for the rheometer pressurization process. After the experiment was conducted with a preheating time of 5 minutes, a cutting time of 5-240 seconds, and a sample of 10 grams, the Gutta Percha did not show any changes in fluidity for 108¡É, 160¡É, but showed a change in its flow ability in 200¡É. Also, the Gutta Percha did not show any changes in its fluidity when it was pressurized by 2.16 and 3.8 kilograms. Therefore, this experiment shows that the heating temperature and the cut-off time showed a significance while measuring the melt flow rate.

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±Ù°üÃæÀü; È帧¼º; °ÅŸÆÛÂ÷; ¿­°¡¼Ò¼º; ÇÏÁß
Canal filling; Melt flow rate; Gutta Percha; Thermoplastic; Weight

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