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THE EFFECT OF NAOCL TREATMENT AND STERILIZATION PROCEDURES ON THE CORROSION OF ENDODONTIC FILES

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Abstract

±Ù°ü Ä¡·á½Ã ¸¹ÀÌ »ç¿ëµÇ°í ÀÖ´Â $K-flex^{(R)}$ S-S ÆÄÀÏ (Maillefer, USA)°ú $Profile^{(R)}$ Ni-Ti ÆÄÀÏ (Maillefer, USA), $K-3^{(R)}$ Ni-TiÆÄÀÏ (SybronEndo, USA)ÀÇ ºÎ½Ä Á¤µµ¸¦ º¸±â À§ÇÏ¿© ÃÑ 360°³ÀÇ 20¹ø fileÀ» 1) ¸ê±Õ¼Òµ¶ ¹æ¹ý (°í¾Ð°¡¿­¸ê±Õ¼Òµ¶, E-O gas ¼Òµ¶) ,2) ±Ù°ü¼¼Ã´ ¾× ($5,25\%$ Â÷¾Æ¿°¼Ò»ê³ªÆ®·ý, »ý¸®½Ä¿°¼ö) ,3) ¸ê±Õ¼Òµ¶ Ƚ¼ö (1, 5, 10ȸ ) ¿¡ µû¶ó 36°³ ½ÇÇ豺À¸·Î ³ª´©¾ú´Ù. °¢°¢ÀÇ ÆÄÀÏÀ» °¢ ±ºº°·Î ó¸®ÇÑ µÚ, ¼¼ ¸íÀÇ °Ë»çÀÚ°¡ ±¤ÇÐ Çö¹Ì°æ ÇÏ¿¡¼­ 25¹èÀÇ ¹èÀ²·Î °Ë»çÇÏ¿© 0; ºÎ½Ä ¾øÀ½, 1; °æµµÀÇ ºÎ½Ä, 2; ÁߵÀÇ ºÎ½Ä, 3; ½ÉÇÑ ºÎ½ÄÀ¸·Î Á¡¼öÈ­ ÇÏ¿´´Ù. ½ÉÇÑ ºÎ½ÄÀ» º¸ÀÌ´Â ÆÄÀÏÀÇ Ç¥¸éÀº SEMÀ¸·Î °üÂûÇÏ¿´°í Kruskal-Wallis test (p < 0.05)¸¦ ÀÌ¿ëÇÏ¿© Åë°è ºÐ¼® ó¸®ÇÏ¿© Â÷¾Æ¿°¼Ò»ê³ªÆ®·ý Á¢ÃË ¿©ºÎ¿Í ¸ê±Õ¼Òµ¶ ¹æ¹ýÀÇ Â÷ÀÌ¿¡ ÀÇÇÑ ºÎ½Ä Á¤µµ¸¦ Æò°¡ÇÏ¿´´Ù. ±× °á°ú °í¾Ð°¡¿­¸ê±Õ¼Òµ¶À» 10ȸ ½ÃÇàÇÑ ÆÄÀÏÀº Åë°èÀûÀ¸·Î À¯ÀÇÇÑ Â÷À̸¦ º¸¿© ºÎ½Ä Á¤µµ°¡ ½ÉÇÏ¿´°í, 1ȸ³ª 5ȸ °í¾Ð°¡¿­¸ê±Õ¼Òµ¶À» ½ÃÇàÇÑ ÆÄÀÏ°ú E-O °¡½º·Î ¼Òµ¶ÇÑ ÆÄÀϵéÀº ºÎ½ÄÀÇ Á¤µµ°¡ °æ¹ÌÇÏ¿© Åë°èÀûÀ¸·Î À¯ÀÇÇÏÁö ¾Ê¾Ò´Ù. Â÷¾Æ¿°¼Ò»ê³ªÆ®·ý Á¢ÃË ¿©ºÎ¿Í Á¦Á¶»ç ȤÀº ÆÄÀÏ Àç·á¿¡ µû¸¥ À¯ÀǼº ÀÖ´Â Â÷ÀÌ´Â ¾ø¾ú´Ù

A variety files made of stainless steel (S-S) or nickel-titanium (Ni-Ti) are used during endodontic treatment. The purpose of tt)is study was to evaluate the corrosion susceptibility of S-S and Ni-Ti endodontic files. Three brands of files were used for this study: $K-flex^{(R)}$ S-S files (Maillefer, USA), $Profile^{(R)}$ Ni-Ti files (Maillefer, USA), $K-3^{(R)}$ Ni-Ti files (SybronEndo. USA). 120 files of each brands (21mm, ISO size $\#20$) were divided into 12 groups according to 1) sterilization methods using Autoclave or Ethylene Oxide (E-O) gas, 2) Irrigation solutions using $5.25\%$ NaOCl or Saline, 3) the number of sterilization (1, 5, 10 times), After above procedures, each of the files was inspected by three examiners with a light microscope and camera at X25. Each file was judged and ranked according to the following criteria: 0;, no corrosion, 1; mild corrosion, 2; moderate corrosion, and 3; severe corrosion. The files of high score were examined under the Scanning Electron Microscope. Data were statistically analyzed with the Kruskal-Wallis test (p < 0.05). Most of the ten time-autoclaved files had showed mild to moderate corrosion. But, one or five time-autoclaved files did not show corrosive surface. NaOCl treatment and E-O gas sterilization did not influence on corrosion. There was a significant difference in corrosion susceptibility between sterilization methods and the number of autoclaving. However, there was no significant difference between brands and file materials.

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