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A comparison of canal centering abilities of four root canal instrument systems using X-ray micro-computed tomography

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°íÇý¼÷, À¯Çö¹Ì, ¹Úµ¿¼º,
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°íÇý¼÷ ( Ko Hye-Suk ) - ¼º±Õ°ü´ëÇб³ ÀÇ°ú´ëÇÐ »ï¼º¼­¿ïº´¿ø Ä¡°úº¸Á¸°ú
À¯Çö¹Ì ( Yoo Heyon-Mee ) - ¼º±Õ°ü´ëÇб³ ÀÇ°ú´ëÇÐ »ï¼º¼­¿ïº´¿ø Ä¡°úº¸Á¸°ú
¹Úµ¿¼º ( Park Dong-Sung ) - ¼º±Õ°ü´ëÇб³ ÀÇ°ú´ëÇÐ »ï¼º¼­¿ïº´¿ø Ä¡°úº¸Á¸°ú

Abstract

ÀÌ ¿¬±¸ÀÇ ¸ñÀûÀº ³× Á¾·ù file systemsÀÇ Áß½ÉÀ¯Áö´É°ú ±Ù°ü¼ºÇü ÀüÈÄÀÇ »ó¾ÆÁú »èÁ¦·®À» ºñ±³ÇÏ´Â °ÍÀÌ´Ù. 10-20µµÀÇ ¸¸°îÀ» °®´Â ¹ß°ÅµÈ 20°³ÀÇ ÇÏ¾Ç Á¦1´ë±¸Ä¡ÀÇ ±Ù½É±Ù°ü(ÃÑ 40°³ÀÇ ±Ù°ü)À» ±Ù°ü¼ºÇü Àü¿¡ X¼± ¹Ì¼¼´ÜÃþÃÔ¿µ ½ºÄ³³Ê¸¦ ÀÌ¿ëÇÏ¿© ½ºÄµÇÏ¿´´Ù. Á¦ 1±ºÀº ±Ù°üºÎ¸¦ ³ÐÈù ÈÄ stainless steel K-FlexofileÀ» »ç¿ëÇÏ¿© step-back techniqueÀ¸·Î ±Ù°ü¼ºÇüÇÏ¿´°í, ³ª¸ÓÁö ±ºµéÀº °¢ Á¦Á¶»çÀÇ Ãßõ´ë·Î ProFile system (2±º), ProTaper system (3±º), K3 system (4±º)À» »ç¿ëÇÏ¿© crown-down techniqueÀ¸·Î ±Ù°ü¼ºÇüÇÏ¿´´Ù. ¸ðµç ±Ù°üÀÇ ±Ù´ÜºÎ ±â±¸Á¶ÀÛÀº #25 Å©±â±îÁö ½ÃÇàÇÏ¿´°í ±Ù°ü¼ºÇü ÈÄ ½ºÄµÇÏ¿´´Ù. 3Â÷¿ø ¿µ»ó ¼ÒÇÁÆ®¿þ¾î·Î ±Ù°ü¼ºÇü ÀüÈÄÀÇ ½ºÄµµÈ À̹ÌÁöµéÀ» À籸¼ºÇÏ¿© ±Ù°üÀÇ ÀüüÀû ºÎÇÇ º¯È­¸¦ ÃøÁ¤ÇÏ¿´´Ù. ¶ÇÇÑ, ±Ù´Ü°øÀ¸·ÎºÎƼ 1, 3, 5, 7 mmµÇ´Â ÁöÁ¡ÀÇ ±Ù°ü Ⱦ´Ü¸éÀ» ºñ±³ÇÏ¿© ±Ù°ü¼ºÇü ÀüÈÄÀÇ ´Ü¸éÀû º¯È­¿Í Á߽ɺ¯À§À²À» »êÃâÇÏ¿´´Ù. ±× °á°ú, ProTaper¿Í K3°¡ ´Ù¸¥ file systemsº¸´Ù »ó¾ÆÁúÀ» ´õ ¸¹ÀÌ »èÁ¦ÇÏ´Â °æÇâÀ» º¸¿´°í ¸ðµç ½ÇÇ豺¿¡¼­ Á᫐ º¯À§À²Àº ±Ù´Ü°øÀ¸·ÎºÎÅÍ 3 mm ÁöÁ¡¿¡¼­ °¡Àå ³·Àº ¼öÄ¡¸¦ ³ªÅ¸³ÂÀ¸¸ç, 3 mm ÁöÁ¡À» Á¦¿ÜÇÏ°í´Â ProTaper°¡ ´Ù¸¥ file systemsº¸´Ù Áß½ÉÀ¯Áö´ÉÀÌ ¶³¾îÁö´Â °á°ú¸¦ ¾òÀ» ¼ö ÀÖ¾ú´Ù (P < 0.05).

The purpose of this study was to compare the centering abilities of four root canal instrument systems and the amounts of dentin removed after root canal shaping using them. The mesial canals of twenty extracted mandibular first molars having 10-20¡É curvature were scanned using X-ray micro-computed tomography (XMCT)-scanner before root canals were instrumented. They were divided into four groups (n = 10 per group). In Group 1, root canals were instrumented by the step-back technique with stainless steel K-Flexofile after coronal flaring. The remainders were instrumented by the crown-down technique with Profile (Group 2), ProTaper (Group 3) or K3 system (Group 4). All canals were prepared up to size 25 at the end-point of preparation and scanned again. Scanned images were processed to reconstruct three-dimensional images using three-dimensional image software and the changes of total canal volume were measured. Pre-and post-operative cross-sectional images of 1, 3, 5, and 7 mm from the apical foramen were com pared. For each level, centering ratio were calculated using Adobe Photoshop 6.0 and image software program. ProTaper and K3 systems have a tendency to remove more dentin than the other file systems. In all groups, the lowest value of centering ratio at 3 mm level was observed. And except at 3 mm level, ProTaper system made canals less centered than the other systems (p < 0.05).

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X-ray micro-computed tomography;ProFile;Protaper;K3;Centering ratio;Three dimensional image software

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