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Size¿Í Taper°¡ ProFile°ú Hyflex CM Ni-Ti ÆÄÀÏÀÇ ±â°èÀû ¹°¼º º¯È­¿¡ ¹ÌÄ¡´Â È¿°ú

Effect of size and taper on the mechanical properties of proFile and Hyflex CM Ni-Ti endodontic files

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ÀÌÇü¿ì, ÀÌâÇÏ, ÀÌÀκ¹,
¼Ò¼Ó »ó¼¼Á¤º¸
ÀÌÇü¿ì ( Lee Hyung-Woo ) - Seoul National University School of Dentistry Dental Research Institute
ÀÌâÇÏ ( Lee Chang-Ha ) - Seoul National University School of Dentistry Dental Research Institute
ÀÌÀκ¹ ( Lee In-Bog ) - Seoul National University School of Dentistry Dental Research Institute

Abstract

º» ¿¬±¸ÀÇ ¸ñÀûÀº, ÆÄÀÏ »èÁ¦ºÎÀ§ÀÇ size¿Í taperÀÇ º¯È­°¡ Ni-Ti ÆÄÀÏÀÇ ±â°èÀû ¼ºÁú¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» ¾Ë¾Æº¸°íÀÚ ÇÏ¿´´Ù. Controlled Memory Wire (CM Wire, DS Dental, Johnson City, TN, USA) Ni-Ti ÇÕ±ÝÀ» »ç¿ëÇÑ ÆÄÀÏÀÎ Hyflex CM (Coltene-Whaledent, Altstatten, Switzerland)°ú ÀüÅëÀû Ni-Ti ÇÕ±ÝÀ» »ç¿ëÇÑ ProFile (Dentsply Maillefer, Ballaigues, Switzerland)À» ´ë»óÀ¸·Î, 20/.04, 25/.04, 30/.04¸¦ ÅëÇØ size º¯È­ÀÇ È¿°ú¸¦ ºñ±³ÇÏ¿´°í, #25¿¡¼­ .04¿Í .06 taper¸¦ ºñ±³Çß´Ù. U-Mechanics Analyser (IB Systems, Seoul, Republic of Korea)¸¦ ÀÌ¿ëÇÏ¿© ±ÁÈû ÀúÇ×¼º, ºñƲ¸² ÀúÇ×¼º, ÇÇ·Î ÆÄÀý ÀúÇ×¼ºÀ» ÃøÁ¤ÇÏ¿´´Ù(n=5). ±ÁÈû ÀúÇ×¼ºÀÇ °æ¿ì ProFileÀº elastic deformationÀ» º¸¿´À¸³ª, Hyflex CMÀº plastic deformation°ú ´õ ³ôÀº ÀÌ·Â(hysteresis)À» ³ªÅ¸³Â´Ù. ProFileÀÇ °æ¿ì size¿Í taper°¡ Áõ°¡ÇÔ¿¡ µû¶ó ±ÁÈû ÀúÇ×¼º°ú ºñƲ¸² ÀúÇ×¼ºÀÌ Áõ°¡ÇÑ ¹Ý¸é, Hyflex CMÀÇ °æ¿ì #25¿Í #30 ÆÄÀÏ¿¡¼­´Â size ¹× taper¿¡ µû¸¥ º¯È­°¡ ¾ø¾ú´Ù. Hyflex CMÀÌ ProFileº¸´Ù ¸ðµç size ¹× taper¿¡¼­ ÇÇ·Î ÆÄÀý ÀúÇ×¼ºÀÌ ÄÇ´Ù. ±Ù°üÀÇ »èÁ¦ È¿À²À» °í·ÁÇÏÁö ¾Ê´Â´Ù¸é, Hyflex CMÀÌ ProFileº¸´Ù ¸¸°î ±Ù°ü ÃßÁ¾¼º Ãø¸é¿¡¼­ À¯¸®Çϸç ÇÇ·Î ÆÄÀýÀÌ ´õ ÀûÀ» °ÍÀ¸·Î »ç·áµÈ´Ù.

The purpose of this study was to investigate the effect of size and taper on the mechanical properties of two Ni-Ti files. A controlled memory Ni-Ti file, Hyflex CM (Coltene-Whaledent, Altstatten, Switzerland) and a conventional Ni-Ti file, ProFile (Dentsply Maillefer, Ballaigues, Switzerland) were used. The size and taper (sizer/taper values) were 20/.04, 25/.04, 25/.06 and 30/.04. The U-Mechanics Analyser (IB Systems, Seoul, Korea) was used to measure the bending, torsional, and fatigue fracture resistance of the files (n=5). ProFile showed elastic deformation, but Hyflex CM showed higher hysteresis with plastic deformation in bending resistance test. The bending and torsional resistance of ProFile increased with increasing size and taper, though the #25 and #30 files of Hyflex CM did not resulted in any change. Hyflex CM showed greater fatigue fracture resistance than ProFile in all sizes and tapers. Without considering root canal excavation efficiency, it is considered that Hyflex CM has better root canal trackability and fewer fatigue fractures than ProFile.

Å°¿öµå

Ni-Ti file; ±ÁÈû ÀúÇ×¼º; ºñƲ¸² ÀúÇ×¼º; ÇÇ·Î ÆÄÀý ÀúÇ×¼º
Ni-Ti file; Bending resistance; Torsional resistance; Fatigue fracture resistance

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