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Evaluation of apical canal shapes produced sequentially during instrumentation with stainless steel hand and Ni-Ti rotary instruments using Micro-computed tomography

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ÀÌ¿ìÁø ( Lee Woo-Jin ) - ¼­¿ï´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Á¸Çб³½Ç
ÀÌÁ¤È£ ( Lee Jeong-Ho ) - ¼­¿ï´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Á¸Çб³½Ç
Àü°æ¾Æ ( Jeon Kyung-A ) - °í·Á´ëÇб³ ¾È¾ÏÀÇ·á¿ø Ä¡°úº¸Á¸°ú
¼­¹Î¼® ( Seo Min-Seock ) - ÇѾç´ëÇб³ ¼­¿ïº´¿ø
À¯¿¬Áö ( Yoo Yeon-Jee ) - ¼­¿ï´ëÇб³ Ä¡ÀÇÇдëÇпø Ä¡°úº¸Á¸Çб³½Ç
¹é½ÂÈ£ ( Baek Seung-Ho ) - ¼­¿ï´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Á¸Çб³½Ç

Abstract

¿¬±¸¸ñÀû: º» ¿¬±¸¿¡¼­´Â micro CT¸¦ »ç¿ëÇÏ¿© SS K-file, Profile, LightSpeed·Î #25ºÎÅÍ #40 Å©±â±îÁö ±Ù°üÀ» Çü¼ºÇÒ ¶§ ±Ù´ÜºÎ ±Ù°ü ÇüÅÂÀÇ ¿¬¼ÓµÇ´Â º¯È­¸¦ Æò°¡ÇÏ¿´´Ù.

¿¬±¸ Àç·á ¹× ¹æ¹ý: 30°³ ÇÏ¾Ç ´ë±¸Ä¡ÀÇ ±Ù½É ±Ù°üÀ» ProFile, LightSpeed¿Í SS K-file·Î #25¹ø¿¡¼­ #40¹ø±îÁö ¼øÂ÷ÀûÀ¸·Î ±Ù°ü Çü¼ºÇÏ¿´°í, ¸Å ´Ü°è È®´ë ÈÄ micro CT¸¦ ½ÃÇàÇÏ¿´´Ù. Ä¡±Ù´Ü 1, 2, 3, 5 mm ¿¡¼­ ±Ù°ü Á᫐ º¯À§¿Í »èÁ¦µÇÁö ¾ÊÀº ´Ü¸éÀÇ ºñÀ²À» ÃøÁ¤ÇÏ¿© ¡¯repeated nested design¡¯ ºÐ¼®¹æ¹ý°ú Mann-Whitney test·Î À¯ÀÇ ¼öÁØ p = 0.05¿¡¼­ °ËÁ¤ÇÏ¿´´Ù.

°á°ú: SS K-file±º¿¡¼­ #30 ÀÌ»ó ±Ù°ü Çü¼º ÈÄ À¯ÀÇÇÒ ¸¸ÇÑ ±Ù°ü Á᫐ º¯À§°¡ Áõ°¡ÇÏ¿´°í, ±Ù°ü Çü¼º °úÁ¤ ¾î´À ´Ü°è¿¡¼­µµ »èÁ¦µÇÁö ¾ÊÀº ¸éÀûÀÇ ºñÀ²ÀÌ À¯ÀǼº ÀÖ°Ô °¨¼ÒµÇÁö ¾Ê¾Ò´Ù. ProFile±º¿¡¼­´Â Ä¡±Ù´Ü 1, 2 mm¿¡¼­ #40 file·Î ±Ù°ü Çü¼º ÈÄ ±Ù°ü Á᫐ º¯À§°¡ Å©°Ô Áõ°¡ÇÏ¿´°í, Ä¡±Ù´Ü 1 mm¿¡¼­ #35 Å©±â·Î ±Ù°ü Çü¼ºÇÑ ÈÄ¿¡ »èÁ¦µÇÁö ¾ÊÀº ¸éÀûÀÇ ºñÀ²ÀÌ À¯ÀǼº ÀÖ°Ô °¨¼ÒÇÏ¿´´Ù. LightSpeed±º¿¡¼­´Â ±Þ°ÝÇÑ ±Ù°ü Á᫐ º¯À§¸¦ °üÂûÇÒ ¼ö ¾ø¾ú°í, ±Ù°ü Á᫐ º¯À§°¡ ProFile±ºº¸´Ù Àû°Ô °üÂûµÇ¾ú´Ù.

°á·Ð: SS K-file, Profile, LightSpeed¿¡¼­ Çü¼ºµÇ´Â ±Ù°üÀÇ º¯ÀÌ Á¤µµ´Â ±Ù´ÜºÎ ±Ù°ü Çü¼º Å©±â¿¡ µû¶ó ´Ù¸£°Ô ³ªÅ¸³µ´Ù.

Objectives: The purpose of this study was to determine the optimal master apical file size with minimal transportation and optimal efficiency in removing infected dentin. We evaluated the transportation of the canal center and the change in untouched areas after sequential preparation with a #25 to #40 file using 3 different instruments: stainless steel K-type (SS K-file) hand file, ProFile and LightSpeed using microcomputed tomography (MCT).

Materials and Methods: Thirty extracted human mandibular molars with separated orifices and apical foramens on mesial canals were used. Teeth were randomly divided into three groups: SS K-file, Profile, LightSpeed and the root canals were instrumented using corresponding instruments from #20 to #40. All teeth were scanned with MCT before and after instrumentation. Cross section images were used to evaluate canal transportation and untouched area at 1-, 2-, 3-, and 5- mm level from the apex. Data were statistically analyzed according to ¡¯repeated nested design¡¯ and Mann-Whitney test (p = 0.05).

Results: In SS K-file group, canal transportation was significantly increased over #30 instrument. In the ProFile group, canal transportation was significantly increased after preparation with the #40 instrument at the 1- and 2- mm levels. LightSpeed group showed better centering ability than ProFile group after preparation with the #40 instrument at the 1 and 2 mm levels.

Conclusions: SS K-file, Profile, and LightSpeed showed differences in the degree of apical transportation depending on the size of the master apical file.

Å°¿öµå

LightSpeed; Master apical file; Micro CT; ProFile; Stainless steel K-file; Transportation

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