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Assessment of sterilization effect and the alteration of surface texture and physical properties of gutta-percha cone after short-term chemical disinfection

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Abstract

º» ¿¬±¸ÀÇ ¸ñÀûÀº ù° ÀÓ»ó¿¡¼­ Áø·á½Ç¿¡ ³ëÃâµÈ °¡Å¸ÆÄÂ÷ ÄÜ Ç¥¸éÀÇ ¿À¿° ±ÕÁ¾À» ÁßÇÕÈ¿¼Ò¿¬¼â¹ÝÀÀ¹ý(polymerase chain reaction, PCR)À» ÀÌ¿ëÇØ µ¿Á¤ÇÏ°í, µÑ° ÀÌµé ¼¼±ÕÀ¸·Î ¿À¿°½ÃŲ °¡Å¸ÆÄÂ÷ ÄÜ¿¡ ´ëÇØ 3 Á¾ÀÇ ¼Òµ¶Á¦ÀÇ short-term sterilizationÈ¿°ú¸¦ ºñ±³ÇÏ¿´´Ù. ¶ÇÇÑ ÀÌµé ¼Òµ¶Á¦¿¡ 5ºÐ°£ ó¸®µÈ °¡Å¸ÆÄÂ÷ ÄÜ Ç¥¸é ¼º»óÀÇ º¯È­¸¦ ÁÖ»çÀüÀÚÇö¹Ì°æÀ¸·Î °üÂûÇÏ¿´°í ¹°¼º º¯È­, ƯÈ÷ ÀÎÀå °­µµ¿Í ¿¬½Å·üÀÇ º¯È­¸¦ ÃøÁ¤, ºñ±³ÇÏ°íÀÚ ÇÏ¿´´Ù. Áø·á½Ç¿¡ ¼ö °³¿ù°£ ³ëÃâµÈ °¡Å¸ÆÄÂ÷ ÄÜ 150°³¸¦ ¼ö°ÅÇÏ¿© ¹è¾çÁö¿¡ ³Ö¾î ¹è¾ç ÈÄ universial primer¸¦ »ç¿ëÇÑ PCR assay¸¦ ÅëÇØ ¿À¿° ±ÕÁ¾À» µ¿Á¤ÇÏ¿´´Ù. ½ÇÇè½Ç »ó¿¡¼­ ÀÌ ±ÕÁ¾À» ´Ù½Ã ¹è¾çÇÏ¿© ¼Òµ¶µÈ °¡Å¸ÆÄÂ÷ ÄÜ¿¡ Á¢Á¾ÇÏ°í 1 ÁÖÀÏ°£ ¹è¾çÇÑ ÈÄ 3 Á¾ÀÇ ¼Òµ¶Á¦ (5% NaOCl, 2% Chlorhexidine, ChloraPrep)¿¡ 1, 5, 10, 30 ºÐ°£ short-term soakingÈÄ °¢ ¼Òµ¶Á¦ÀÇ Á¾·ù¿Í Àû¿ë½Ã°£¿¡ µû¸¥ ¸ê±Õ È¿°ú¸¦ turbidity test¿Í subculture¸¦ ÀÌ¿ëÇÏ¿© Æò°¡ÇÏ¿´´Ù. ¶ÇÇÑ °¢ ¼Òµ¶Á¦¿¡ 5 ºÐ°£ ó¸®µÈ °¡Å¸ÆÄÂ÷ ÄÜ Ç¥¸é ¼º»óÀÇ º¯È­¸¦ ÁÖ»çÀüÀÚÇö¹Ì°æÀ¸·Î °üÂûÇÏ¿´À¸¸ç ¹°¼º º¯È­¸¦ Æò°¡Çϱâ À§ÇØ Instron 5500À» ÀÌ¿ëÇÏ¿© ¿¬½Å·ü ¹× tensile strength¸¦ ÃøÁ¤ÇÑ ÈÄ Åë°èÇÐÀû À¯ÀǼº ¿©ºÎ¸¦ °ËÁõÇÏ¿´´Ù. ÁßÇÕÈ¿¼Ò¿¬¼â¹ÝÀÀ¹ýÀÇ ºÐ¼®°á°ú 19.4%ÀÇ °¡Å¸ÆÄÂ÷ ÄÜ ÀÌ ¿À¿°µÈ °ÍÀ¸·Î ³ªÅ¸³µ°í ´ëºÎºÐÀÌ Staphylococcus °èÅëÀ̾úÀ¸¸ç, 3 Á¾ÀÇ ¼Òµ¶Á¦ ¸ðµÎ ÀÌµé ±ÕÁ¾¿¡ ´ëÇØ 1 ºÐ³»¿¡ ¸ê±Õ È¿°ú¸¦ ³ªÅ¸³Â´Ù. ÁÖ»çÀüÀÚÇö¹Ì°æ»ó NaOCl·Î ¼Òµ¶µÈ °¡Å¸ÆÄÂ÷ ÄÜ Ç¥¸é¿¡´Â cuboidal crystal ÀÇ Ä§Àü¹°ÀÌ Àü¹ÝÀûÀ¸·Î °üÂûµÇ¾ú´Ù. Tensile strength´Â NaOCl±º¿¡¼­ ´Ù¸¥ ±º¿¡ ºñÇØ À¯ÀǼº ÀÖ´Â Áõ°¡¸¦ º¸¿´À¸¸ç (p < 0.05). elongation rate´Â 3 Á¾ÀÇ ¼Òµ¶Á¦ ¸ðµÎ ´ëÁ¶±º¿¡ ºñÇØ À¯ÀǼº ÀÖ´Â Áõ°¡¸¦ º¸¿´À¸³ª (p < 0.05), ƯÈ÷ ChloraPrep±º¿¡¼­ °¡Àå Å« Áõ°¡¸¦ º¸¿´´Ù. º» ¿¬±¸ °á°ú 3 Á¾ÀÇ ¼Òµ¶Á¦ ¸ðµÎ ±Ù°üÃæÀü Àü °¡Å¸ÆÄÂ÷ ÄÜÀÇ rapid sterilizationÀ» À§ÇØ À¯¿ëÇÏ°Ô »ç¿ëÇÒ ¼ö ÀÖÀ½À» ½Ã»çÇÑ´Ù.

The purposes of this study were firstly to identify the microbial species on gutta-percha (GP) cones exposed at clinics using polymerase chain reaction, and secondly to evaluate the short-term sterilization effect of three chemical disinfectants It also evaluated the alteration of surface texture and physical properties of GP cones after 5-min soaking into three chemical disinfectants. 150 GP cones from two endodontic departments were randomly selected for microbial detection using PCR assay with universal primer. After inoculation on the sterilized GP cones with the same microorganism identified by PCR assay, they were soaked in three chemical disinfectants 5% NaOCl, 2% Chlorhexidine, and ChloraPrep for 1, 5, 10, and 30 minutes. The sterilization effect was evaluated by turbidity and subculture. The change of surface textures using a scanning electron microscope and the tensile strength and elongation rate of the GP cones were measured using an Instron 5500 (Canton). Statistical analysis was performed. Four bacterial species were detected in 29 GP cones (19.4%), and all the species belonged to the genus Staphylococcus. All chemical disinfectants were effective in sterilization with just 1 minute soaking. On the SEM picture of NaOCl-soaked GP cone, a cluster of cuboidal crystals was seen on the cone surface. The tensile strength of NaOCl-soaked group was significantly higher than the other groups (p < 0.05). Also, all disinfectants significantly increased the elongation rate of GP cones compared to the fresh GP cone (p < 0.05). Present data demonstrate that three chemical disinfectants are useful for rapid sterilization of GP cone just before obturation.

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