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CYCLIC FATIGUE OF THE SODIUM HYPOCHLORITE TREATED AND /OR STEAM AUTOCLAVED NICKEL-TITANIUM ENDODONTIC FILES

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Á¶Çý¿µ ( Cho Hye-Young ) - ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ º¸Á¸Çб³½Ç
Á¤ÀÏ¿µ ( Jung Il-Young ) - ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ º¸Á¸Çб³½Ç
ÀÌÂù¿µ ( Lee Chan-Young ) - ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ º¸Á¸Çб³½Ç
±èÀǼº ( Kim Eui-Seong ) - ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ º¸Á¸Çб³½Ç

Abstract

º» ¿¬±¸¿¡¼­´Â Â÷¾Æ¿°¼Ò»ê³ªÆ®·ý ¿ë¾× ¹× °í¾ÐÁõ±â¸ê±ÕÀÌ ±Ù°ü Ä¡·á¿ë Ni-Ti ÆÄÀÏÀÇ ÁÖ±âÀû ÇÇ·Î ÆÄÀý¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» ¾Ë¾Æº¸°íÀÚ ÇÏ¿´´Ù.
ÆÄÀÏ Ã·´Ü Å©±â°¡ 30ÀÌ°í .06 taper¸¦ °¡Áö´Â Hero 642 {(R)}¿Í K3 {(R)}ÆÄÀÏ 70°³¸¦ 10°³¾¿ 7°³ÀÇ ±ºÀ¸·Î ³ª´©¾úÀ¸¸ç, 6% Â÷¾Æ¿°¼Ò»ê³ªÆ®·ý ¿ë¾×¿¡ 15ºÐ (N15±º), 30ºÐ (N30±º), °í¾ÐÁõ±â¸ê±ÕÀº 121; {circ}CÀÇ ¿Âµµ, 0.12 MPaÀÇ ¾Ð·Â¿¡¼­ 20ºÐ°£ ½ÃÇàÇÏ´Â °ÍÀ» ÀÏ È¸·Î ÇÏ¿© 5ȸ (H5±º), 10ȸ (H10), °í¾ÐÁõ±â¸ê±Õ 5ȸ ÈÄ Â÷¾Æ¿°¼Ò»ê³ªÆ®·ý ¿ë¾× 15ºÐ(H5N15), °í¾ÐÁõ±â¸ê±Õ 10ȸ ÈÄ Â÷¾Æ¿°¼Ò»ê³ªÆ®·ý ¿ë¾× 30ºÐ (H10N30) ó¸® ÈÄ ÁÖ±âÀû ÇÇ·Î ÆÄÀý ½ÇÇèÀ» ¼öÇàÇÏ¿© ÆÄÀÏÀÌ ÆÄÀýµÉ ¶§±îÁöÀÇ ½Ã°£À» ÃÊ ´ÜÀ§·Î ÃøÁ¤ÇÏ¿´´Ù. ´ëÁ¶±ºÀº Àü󸮸¦ ÇÏÁö ¾Ê°í ÁÖ±âÀû ÇÇ·Î ÆÄÀýÀ» ½ÃÇàÇÏ¿´´Ù. 95%ÀÇ ½Å·Úµµ·Î one-way analysis of varience¸¦ ÀÌ¿ëÇÏ¿© Åë°è ó¸®ÇÏ¿´À¸¸ç, ´ÙÁß ºñ±³´Â Tukey¹æ¹ýÀ¸·Î ºÐ¼®ÇÏ¿´´Ù. ÆÄÀÏÀÇ Ç¥¸éÀ» ÁÖ»çÀüÀÚÇö¹Ì°æÀ¸·Î °üÂûÇÏ¿´´Ù.
ÁÖ±âÀû ÇÇ·Î ÆÄÀý¿¡ ¼Ò¿äµÈ ½Ã°£Àº Hero 642 {(R)}´Â °¢ ±ºº°·Î À¯ÀÇÇÒ ¸¸ÇÑ Â÷ÀÌ°¡ ¾ø¾úÀ¸¸ç, K3 {(R)}´Â N15, N30, H5N15±º¿¡¼­ ´ëÁ¶±º¿¡ ºñÇØ ÂªÀº ½Ã°£ÀÌ ¼Ò¿äµÈ °ÍÀ¸·Î ³ªÅ¸³µ´Ù (p < 0.05).
ÁÖ»çÀüÀÚ Çö¹Ì°æ¿¡¼­ °üÂûÇßÀ» ¶§ Hero 642 {(R)}¿Í K3 {(R)}¸ðµÎ N15, N30±º¿¡¼­ ÆÄÀÏÀÇ Ç¥¸é°ú ³¯ÀÌ ºÎ½ÄÀÌ µÇ¾î ´ëÁ¶±º¿¡¼­ °üÂûµÈ ÀÏÁ¤ ¹æÇâÀ¸·Î ¹è¿­µÈ Á¤ÇüÈ­µÈ ¿¹¸®ÇÑ ºø»ì¹«ÀÇ°¡ ºÎºÐÀûÀ¸·Î Æı«µÈ ÇüÅ°¡ °üÂûµÇ¾úÀ¸¸ç, N15±º¿¡ ºñÇØ N30±º¿¡¼­ ÆÄÀÏÀÇ ÇüÅ°¡ Æı«µÈ ¾ç»óÀÌ ¶Ñ·ÇÇßÀ¸¸ç, Hero 642 {(R)}º¸´Ù K3 {(R)}°¡ ½ÉÇÏ°Ô ºÎ½ÄµÈ ¾ç»óÀ̾ú´Ù. H5±º°ú H10±º¿¡¼­´Â K3 {(R)} ÆÄÀÏÀº ³¯ ºÎºÐÀÌ ¹«µð¾îÁø ¾ç»óÀ» º¸¿´°í, Hero 642 {(R)}´Â ÇüÅ Æı«°¡ ¶Ñ·ÇÇÏÁö ¾Ê¾ÒÀ¸³ª H10±º¿¡¼­ Ç¥¸éÀÇ ºø»ì¹«´Ì°¡ ¾à°£ ¹«µð¾îÁø ¾ç»óÀ» º¸¿´´Ù. H5N15±º°ú H10N30±º¿¡¼­´Â ±×´ÙÁö ¶Ñ·ÇÇÑ Çüź¯È­´Â ¾ø¾ú´Ù. º» ¿¬±¸ °á°ú K3 {(R)}ÆÄÀÏÀ» »ç¿ë ½Ã¿¡´Â °¡´ÉÇÑ ÇÑ Â÷¾Æ¿°¼Ò»ê³ªÆ®·ý¿¡ ÀûÀº ½Ã°£ ³ëÃâ½ÃÅ°´Â °ÍÀÌ ÆÄÀÏÀÇ ºÎ½ÄÀ¸·Î ÀÎÇÑ ÇüÅÂÀÇ ¼Õ»óÀ» ¹æÁöÇÒ ¼ö ÀÖ°í, ÁÖ±âÀû ÇÇ·Î ÆÄÀý¿¡ °É¸®´Â ½Ã°£µµ °¨¼Ò½Ãų ¼ö ÀÖÀ» °ÍÀÌ´Ù.

The purpose of this study was to determine the effect of sodium hypochlorite and steam autoclaving on the cyclic fatigue of nickel-titanium endodontic files.
Two types of files with a .06 taper and 30 were used, K3 {(R)} (SybronEndo, Glendora, California, USA) and Hero 642 {(R)}(Micro-Mega, BesanCon, France).
The files were divided into 6 experimental groups containing 10 files each group depending the soaking time in 6% sodium hypochlorite solution and number of cycles of steam autoclave. After sterilization, a cyclic fatigue test was performed on each file, and the fracture time was recorded in seconds. The control group underwent the cyclic fatigue test only. After the test, the surface characteristics of the files were observed using scanning electron microscopy (SEM).
All groups containing the Hero 64~ files showed a similar cyclic fatigue fracture time. However, the cyclic fatigue fracture time with the K3 {(R)} files was significantly shorter in groups which were treated with sodium hypochlorite than in the control group (P < 0.05), SEM revealed both Hero 642 {(R)} and K3 {(R)} files to have significant corrosion on the file surface in groups treated with sodium hypochlorite, compared with the sharp and regular blades of the control group. K3 {(R)} files showed more corrosion than the Hero 642 {(R)} files. Bluntness of the blades of the K3 {(R)} file was observed in groups treated with steam autoclave. Although there was no obvious destruction on the surface of steam autoclaved Hero 642 {(R)} files, slight bluntness was observed.
Sterilizing with a steam autoclave is much less destructive to K3 {(R)} files than sodium hypochlorite. The longer time exposed to sodium hypochlorite, the more destructive pattern was shown on the blades of the files. Therefore, when using sodium hypochlorite solution, the exposure time should be as short as possible in order to prevent corrosion and increase the cyclic fatigue fracture time.

Å°¿öµå

Ni-Ti ÆÄÀÏ;ÁÖ±âÀû ÇÇ·Î ÆÄÀý;Â÷¾Æ¿°¼Ò»ê³ªÆ®·ý ¿ë¾×;°í¾ÐÁõ±â¸ê±Õ
Cyclic fatigue fracture;Ni-Ti endodontic files;sodium hypochlorite solution;steam autoclave

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