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THE CHANGE OF CANAL CONFIGURATION AFTER INSTRUMENTATION BY SEVERAL NICKEL-TITANIUM FILES IN THE SIMULATED CANAL WITH ABRUPT CURVATURE

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Abstract

º» ¿¬±¸´Â Ä¡±Ù÷ºÎÀ§ÀÇ ±ÞÇÑ ¸¸°îÀ» °¡Áø ±Ù°ü¿¡¼­ ¿£Áø±¸µ¿Çü ´ÏÄÌ-ŸÀÌŸ´½±â±¸¸¦ ÀÌ¿ëÇØ ±Ù°ü ¼ºÇü½Ã ±Ù°üÇüÅ º¯È­¿¡ ´ëÇÑ ºñ±³ ¿¬±¸¸¦ ÇÔÀ¸·Î½á ¾î¶² ±â±¸°¡ ±Ù°üÀÇ º»·¡ ÇüŸ¦ Àß À¯ÁöÇϴ°¡¸¦ ±¸¸íÇϱâ À§ÇÏ¿© ½ÃÇàµÇ¾ú´Ù. $\sharp$15 finger spreader¸¦ ÀÌ¿ëÇØ ¸¸°îµÈ ±Ù°üÀÇ ÁÖÇüÀ» Çü¼ºÇÏ°í epoxy resinÀ¸·Î ¸ðÇü ±Ù°üÀ» °®´Â ·¹Áø ºí·Ï 96°³¸¦ Á¦ÀÛÇÏ¿´´Ù. ¸ðÇü ±Ù°üÀº ¸¸°îÀÇ ¹Ý°æÀÌ 1.5mm, 3.0mm, 4.0mm ¹× 6.0mm¸¦ °¡Áö¸ç, ±Ù°üÀÇ ¸¸°îµµ´Â 90µµ·Î Á¦ÀÛÇÏ¿´´Ù. ¿£Áø±¸µ¿Çü ´ÏÄÌ-ŸÀÌÅË´½ ÆÄÀÏ·Î ProFile, ProTaper, Hero 642 ±×¸®°í $K^3$¸¦ »ç¿ëÇÏ¿´À¸¸ç Å©¶ó¿î´Ù¿î¹ýÀ» ÀÌ¿ëÇÏ¿© Á¦Á¶È¸»çÀÇ Áö½Ã¿¡ µû¶ó 300rpmÀ¸·Î ±Ù°üÀ» ¼ºÇüÇÏ¿´´Ù ½Ã¼ú Àü$\cdot$ÈÄ »çÁøÀ» µðÁöÅÐ Ä«¸Þ¶ó¸¦ ÀÌ¿ëÇÏ¿© ÃÔ¿µÇÑ ÈÄ, À̹ÌÁöºÐ¼®±â¸¦ ÀÌ¿ëÇÏ¿© ±Ù°üÀÇ º¯È­·®À» ÃøÁ¤ÇÏ¿´´Ù. ±Ù°üÀÇ ¸¸°îÀ» µû¶ó¼­ Ä¡±Ù÷À¸·ÎºÎÅÍ 1mm°£°ÝÀ¸·Î °èÃøÁ¡À» ÃÑ 9ºÎºÐÀ» ¼³Á¤ÇÏ¿© ¿ø·¡ÀÇ ±Ù°üÇüÅ°¡ À¯ÁöµÇ´Â Á¤µµ¸¦ ÃøÁ¤ÇÏ¿´´Ù °¢ °èÃøÁ¡ ¿¡¼­ ±Ù°üÀÇ Áß½ÉÃàÀÇ º¯À§·®, ±Ù°üÀÇ ÆøÀÇ º¯È­·®À» ÃøÁ¤ÇÏ¿´´Ù. °èÃøÁ¡¿¡¼­ °¢ ±â±¸µé°£ÀÇ À¯ÀǼºÀº Kruskal-Wallis ºÐ¼®¹ýÀ» ÀÌ¿ëÇÏ¿´°í ±â±¸°£¿¡ °ËÁ¤Àº Mann-Whitney U-testºÐ¼®¹ýÀ» ÀÌ¿ëÇÑ °á°ú ±Þ°ÝÈ÷ ¸¸°îµÈ ±Ù°ü ¼ºÇü½Ã¿¡ ¹Ý°æ 1.5mmÀÇ ¸¸°î¿¡¼­´Â ¿£Áø±¸µ¿Çü ´ÏÄÌ-ŸÀÌŸ´½ ÆÄÀÏÀ» »ç¿ë½Ã ÁÖÀǸ¦ ¿äÇϸç, ¹Ý°æ 3.0mm ÀÌ»óÀÇ ¸¸°î¿¡¼­´Â ´Ù¸¥ ¿£Áø±¸µ¿Çü ´ÏÄÌ-ŸÀÌŸ´½ ÆÄÀϺ¸´Ù´Â ProFileÀÇ »ç¿ëÀÌ ±Ç°íµÈ´Ù.

The purpose of this study was to evaluate which type of Ni-Ti files are able to maintain canal configuration better in the simulated canal with abrupt curvature near it¡¯¡¯s apex. Ninety six simulated root canals were made in epoxy resin and $\sharp$15 finger spreader was used as root canal templates. The simulated root canals were made with radius of curvature of 1.5mm, 3.0mm, 4.0mm, 6.0mm respectively and the angle of curvature of all simulated canals were adjusted to 90 degree. The simulated canals were instrumented by ProFile, ProTaper, Hero 642, and $K^3$ at a 300 rpm using crown-down pressureless technique. Pre-instrumented and post-instrumented images were taken by digital camera and were superimposed with Adobe Photos hop 6.0 program. Images were compared by image analysis program. The changes of canal width at the inner and outer side of the canal curvature. canal transportation were measured at 9 measuring point with 1 mm interval. Statistical analysis among the types of Ni-Ti files was performed using Kruskal-Wallis test and Mann-Whitney U-test. The result was that ProFile maintain original canal configuration better than other engine driven Ni-Ti files in the canals above 3.0mm radius of curvature, and in the 1.5mm radius of curvature, most of Ni-Ti flies were deformed or separated during instrumentation.

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