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Measurement of thermal expansion characteristic of root canal filling materials : Gutta-percha and Resilon

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ÀÌÀκ¹ ( Lee In-Bog ) - ¼­¿ï´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Á¸Çб³½Ç
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ÀÌ¿ìö ( Lee Woo-Cheol ) - ¼­¿ï´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Á¸Çб³½Ç
¹é½ÂÈ£ ( Baek Seung-Ho ) - ¼­¿ï´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Á¸Çб³½Ç

Abstract

±Ù°üÃæÀüÀç·Î »ç¿ëµÇ´Â gutta-perchaÀÇ ´ëüÀç·Î¼­ ResilonÀ̶ó´Â bioactive glass¿Í ¾à°£ÀÇ ¹æ»ç¼± ºÒÅõ°ú¼º ¼ººÐÀ» Æ÷ÇÔÇÏ´Â ¿­°¡¼Ò¼º °íºÐÀÚ°¡ ÃÖ±Ù ¼Ò°³µÇ¾ú´Ù. º» ¿¬±¸¿¡¼­´Â ¿­¿¬È­ ÁÖÀÔ½Ä gutta-percha¿Í ResilonÀÇ ¿­ÆØâ Ư¼ºÀ» ÃøÁ¤ÇÏ°í »óÈ£ ºñ±³ÇÏ¿´´Ù. ½ÇÇèÀç·á Áß gutta-percha ±ºÀ¸·Î´Â Obtura, Diadent ±×¸®°í Metadent»çÀÇ gutta-percha¸¦, ResilonÀ¸·Î Pentron»çÀÇ Epiphany¸¦ »ç¿ëÇÏ¿´´Ù. ¿­°¡¾ÐÁÖÀÔ±âÀÎ Obtura II¿¡ 4°¡Áö Àç·á¸¦ ³Ö°í ¼³Á¤¿Âµµ¸¦ 100¡É, 150¡É, 180¡É ±×¸®°í 200¡É·Î ¹Ù²Ù¾î °¡¸ç °¢ ¿Âµµ¿¡ ´ëÇؼ­, heat-ing chamber ÀÔ±¸¿¡¼­ÀÇ ¿Âµµ¿Í 23 °ÔÀÌÁö¿Í 20 °ÔÀÌÁöÀÇ needle¿¡¼­ »çÃâµÇ´Â Àç·áÀÇ ¿Âµµ¸¦ µðÁöÅÐ thermometer¸¦ ÀÌ¿ëÇÏ¿© ÃøÁ¤ÇÏ¿´´Ù. ¿­ÆØâÀ» ÃøÁ¤Çϱâ À§ÇØ ¼¼¶ó¹ÍÀ¸·Î ³»°æ 3 mm, ¿Ü°æ 10 mm. ±æÀÌ 27 mmÀÇ ¿øÅëÇü ÁÖÇüÀ» Á¦ÀÛÇÏ¿´°í, ÁÖÇü ¾È¿¡ °¢ Àç·á¸¦ ä¿ö ³ÖÀº ÈÄ ¾ç³¡À» ¼¼¶ó¹Í °øÀÌ (plunger)·Î ¸·¾Ò´Ù. ÀÌ ½ÃÆíÀ» dilatometer¿¡ ³Ö°í °¡¿­ÇÏ¿© 25¡É¿¡¼­ 75¡É±îÁöÀÇ ¹üÀ§¿¡¼­ ¿­ÆØâ °î¼±À» ¾ò¾ú´Ù. ¿Âµµ¿¡ µû¸¥ ½ÃÆíÀÇ ±æÀÌ º¯È­·ÎºÎÅÍ °¢ Àç·áÀÇ ¿­ÆØâ °è¼ö¿Í ÀüüºÎÇÇ¿¡ ´ëÇÑ ÆØâ·®À» °è»êÇÏ¿´´Ù. ¸ðµç Àç·á¿¡¼­ ¿Âµµ°¡ Áõ°¡ÇÔ¿¡ µû¶ó 45¡É ÀÌÇÏ¿¡¼­´Â Àç·áÀÇ ºÎÇǺ¯È­°¡ °ÅÀÇ ¾ø¾ú°í, 45¡É¿¡¼­ 55¡É ±¸°£¿¡¼­ ±Þ°ÝÈ÷ ÆØâÇÏ¿´À¸¸ç ±× ÀÌ»óÀÇ ¿Âµµ¿¡¼­´Â ¿Ï¸¸ÇÑ ºÎÇÇÀÇ Áõ°¡¸¦ º¸¿´´Ù. 35¡É¿¡¼­ 55¡É »çÀÌ¿¡¼­ÀÇ ºÎÇÇÀÇ º¯È­´Â Àç·áµé »çÀÌ¿¡ Åë°èÀûÀ¸·Î À¯ÀÇÇÑ Â÷ÀÌ°¡ ¾ø¾úÀ¸¸ç (p > 0.05). 35¡É¿¡¼­ 75¡É»çÀÌÀÇ ºÎÇÇÀÇ º¯È­´Â Obtura »ç gutta-percha°¡ Metadent»ç¿Í Diadent»çÀÇ gutta-percha¿¡ ºñÇØ À¯ÀÇÇÏ°Ô ÀÛÀº °ÍÀ¸·Î ³ªÅ¸³µ´Ù (p <0.05). Epiphany´Â gutta-percha ±ºµé°ú ºñ½ÁÇÑ ¿­ÆØâÀ» º¸¿´´Ù (p > 0.05).

The purpose of this study was to evaluate the thermal expansion characteristics of injectable ther-moplasticized gutta-perchas and a Resilon. The materials investigated are Obtura gutta-percha, Diadent gutta-percha, E&Q Gutta-percha Bar and Epiphany (Resilon). The temperature at the heating chamber orifice of an Obtura II syringe and the extruded gutta-percha from the tip of both 23- and 20-gauge needle was determined using a Digital thermometer. A cylindrical ceramic mold was fabricated for thermal expansion test, which was 27 mm long, with an internal bore diameter of 3 mm and an outer diameter of 10 mm. The mold was filled with each experimental material and barrel ends were closed with two ceramic plunger. The samples in ceramic molds were heated in a dilatometer over the temperature range from 25¡É to 75¡É. From the change of specimen length as a function of temperature, the coefficients of thermal expansion were deter-mined. There was no statistical difference between four materials in the thermal expansion in the range from 35¡É to 55¡É(p > 0.05). However, Obtura Gutta-percha showed smaller thermal expansion than Diadent and Metadent ones from 35¡É to 75¡É (p < 0.05). The thermal expansion of Epiphany was similar to those of the other gutta-percha groups [J Kor Acad Cons Dent 31(5):344-351, 2006]

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Thermal expansion;Gutta-percha;Resilon;Dilatometer;Temperature

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