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Mtwo Àüµ¿ ÆÄÀÏÀ» »ç¿ëÇÑ single length technique°ú crown-down techniqueÀÇ ±Ù°ü¼ºÇü È¿À² ºñ±³

Comparison of shaping ability between single length technique and crown-down technique using Mtwo rotary file

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ÀÓÀ¯°æ ( Lim Yoo-Kyoung ) - ºÎ»ê´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç
¹ÚÁ¤±æ ( Park Jeong-Kil ) - ºÎ»ê´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç
Ç㺹 ( Hur Bock ) - ºÎ»ê´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç
±èÇöö ( Kim Hyeon-Cheol ) - ºÎ»ê´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç

Abstract

ÀÌ ¿¬±¸ÀÇ ¸ñÀûÀº Mtwo Àüµ¿ ÆÄÀÏÀÇ »ç¿ë¿¡ À־ Á¦Á¶»ç°¡ Á¦¾ÈÇÑ single length technique°ú crown-down techniqueÀÇ ±Ù°ü¼ºÇüÈ¿À²°ú ¾ÈÀü¼ºÀ» ºñ±³ÇÏ°í Mtwo Àüµ¿ ÆÄÀÏÀÇ º¯ÇüµÈ »ç¿ë¹æ¹ýÀ» Á¦¾ÈÇÏ°íÀÚ ÇÏ´Â °ÍÀÌ´Ù. ±â±¸ÀÇ Á¾·ù¿Í »ç¿ë¹æ¹ý¿¡ µû¶ó 60°³ÀÇ ·¹Áø ºí·Ï ±Ù°ü ¸ðÇü (Endo Training Bloc; Benstply Maillefer, Ballaigues, Switzerland)À» ¼¼ ±ºÀ¸·Î ³ª´©¾î 20°³¾¿ Ç¥º»À» ¼ºÇüÇÏ¿´´Ù. MT±ºÀº Mtwo ÆÄÀÏ (VDW, Munich, Germany)À» Á¦Á¶»çÀÇ Ãßõ¹æ¹ýÀÎ single length techniqueÀ¸·Î, MC±ºÀº Mtwo ÆÄÀÏÀ» crown-down techniqueÀ¸·Î Çü¼ºÇÏ¿´°í, ´ëÁ¶±ºÀÎ PT±ºÀº ProTaper (Denstply Maillefer, Ballaigues, Switzerland)¸¦ »ç¿ëÇÏ¿´´Ù. ¸ðµç ±â±¸´Â 250 r.p.m., torque 2.2 N·Î °íÁ¤ÇÑ Àüµ¿ ¸ðÅÍ (X-smart; Denstply Maillefer, Ballaigues, Switzerland)·Î »ç¿ëÇÏ¿´´Ù. ±Ù°ü ¼ºÇü ÈÄ, ½ºÄ³³Ê·Î ±Ù°ü Çü¼º ÀüÈÄÀÇ À̹ÌÁö¸¦ äµæÇÏ¿© Áßø ºñ±³ÇÔÀ¸·Î½á ±Ù´ÜºÎ·ÎºÎÅÍ 1, 2, 3, 4, 5, 6, 7, 8 mm ³ôÀÌ¿¡¼­ÀÇ Á߽ɺ¯À§À²À» »êÃâÇÏ¿´´Ù. ¼ø¼ö ±â±¸Á¶ÀÛ ½Ã°£ ¹× ±â±¸Á¶ÀÛ µ¿¾ÈÀÇ bindingºóµµ¸¦ ±â·ÏÇÏ¿´´Ù. ±Ù°ü ¼ºÇü ÈÄ, ·¹Áø ºí·ÏÀÇ ¹«°Ô °¨¼Ò¸¦ ÃøÁ¤ÇÏ¿´°í ±Ù°ü ¼ºÇü¿¡ »ç¿ëµÈ ÆÄÀÏÀÇ ÆÄÀýÀ̳ª º¯Çü ¹× ±Ù°ü ¼ºÇü ÈÄ ÇüÅÂÀÇ ÀÌ»óÀ» Á¶»çÇÏ¿´´Ù. ¼¼ ½ÇÇ豺ÀÇ ÃøÁ¤ ¹× »êÃâµÈ ÀڷḦ ÀÏ¿ø¹èÄ¡ ºÐ»êºÐ¼® ¹× Duncan¡¯s Multiple Range Test·Î »çÈÄ °ËÁ¤À» ½ÃÇàÇÏ¿© ºñ±³ÇÏ¿´À¸¸ç, Fisher¡¯s exact testÀ¸·Î ±Ù°üÀÇ ÀÌÇü¼º, ±â±¸ÀÇ º¯Çü ±×¸®°í ±â±¸ binding µî ¹ß»ý ºóµµ¸¦ À¯ÀÇ È®·ü 95%¿¡¼­ Åë°è °ËÁ¤ÇÏ¿´´Ù. ±× °á°ú´Â ´ÙÀ½°ú °°´Ù. 1. ±Ù°üÀÇ ¸¸°îµµ °¨¼Ò, Á߽ɺ¯À§À², ·¹Áø ºí·ÏÀÇ ¹«°Ô °¨¼Ò, ±â±¸ º¯Çü µîÀº ¼¼ ±º°£¿¡ À¯ÀÇÇÑ Â÷ÀÌ°¡ ¾ø¾ú´Ù (p > 0.05). 2. ±â±¸ Á¶ÀÛ ½Ã°£Àº º¸¸é MT±º°ú MC±ºÀÌ PT±ºº¸´Ù ª¾Ò´Ù (p < 0.05). 3. Elbow´Â MT±ºÀÌ MC±º¿¡¼­ PT±ºº¸´Ù ´õ ¸¹ÀÌ Çü¼ºµÇ¾ú´Ù (p < 0.05). Ledge´Â ¼¼ ±º ¸ðµÎ¿¡¼­ ³ªÅ¸³ªÁö ¾Ê¾Ò´Ù. 4. ÆÄÀÏ binding Ƚ¼ö´Â MC±ºÀÌ °¡Àå Àû°í PT±ºÀÌ °¡Àå ¸¹¾Ò´Ù (p < 0.05). ÀÌ»óÀÇ °á°ú¸¦ º¼ ¶§, Mtwo Àüµ¿ ÆÄÀÏÀ» crown-down techniqueÀ¸·Î »ç¿ëÇÏ´Â °ÍÀÌ single length technique°ú À¯»çÇÑ ¼ºÇü È¿À²À» º¸À̸鼭µµ ´õ ¾ÈÀüÇÒ °ÍÀ¸·Î ÃßÁ¤µÈ´Ù.

The aims of this study were to compare the shaping effect and safety between single length technique recommended by manufacturer and crown-down technique using Mtwo rotary file and to present a modified method in use of Mtwo file. Sixty simulated root canal resin blocks were used. The canals were divided into three groups according to instrument and the manner of using methods. Each group had 20 specimens. Group MT was instrumented with single length technique of Mtwo, group MC was instrumented with crown-down technique of Mtwo and group PT was instrumented with crown-down technique of ProTaper. All of the rotary files used in this study were operated by an electric motor. The scanned canal images of before and after preparation were superimposed. These superimposed images were evaluated at apical 1 to 8 mm levels Angle changes were calculated. The preparation time, weight loss, instrument failure and binding, canal aberrations, and centering ratio were measured. Statistical analysis of the three experimental groups was performed with ANOVA and Duncan¡¯s multiple range tests for post-hoc comparison and Fisher¡¯s exact test was done for the frequency comparison. In total preparation time, group MT and group MC were less than group PT. In the aberrations, group MT had more elbows than those of group MC and group PT. The binding of group MC was least and group MT was less than group PT (P < 0.05). Under the condition of this study, crown-down technique using Mtwo rotary file is better and safer method than single length technique recommended by the manufacturer.

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Mtwo file;Single length technique;Crown-down technique;Shaping ability;Binding

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