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STRESS DISTRIBUTION OF THREE NITI ROTARY FILES UNDER BENDING AND TORSIONAL CONDITIONS USING 3-DIMENSIONAL FINITE ELEMENT ANALYSIS

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±èÅ¿À ( Kim Tae-Oh ) - ºÎ»ê´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç
ÀÌÂùÁÖ ( Lee Chan-Joo ) - ºÎ»ê´ëÇб³ ±â°è°øÇаú
±èº´¹Î ( Kim Byung-Min ) - ºÎ»ê´ëÇб³ ±â°è°øÇаú
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 ¼¼°¡Áö ´ÏÄÌ-ƼŸ´½ ÆÄÀÏÀÇ ÈÚ°ú ȸÀü Á¶°Ç ÇÏ¿¡¼­ÀÇ ÀÀ·Â ºÐÆ÷¸¦ À¯ÇÑ¿ä¼Ò ¸ðÇüÀ» ÀÌ¿ëÇÏ¿© ºñ±³ÇÏ´Â °ÍÀÌ´Ù. ProFile .06/#30, ProTaper¿Í ProTaper UniversalÀÇ F3ÆÄÀÏÀ» ¸¶ÀÌÅ©·ÎÄÄÇ»ÅÍ ´ÜÃþÃÔ¿µÀ» ÇÏ°í reverse engineeringÀ» ÅëÇÏ¿© ¼¼ ´ÏÄÌ Æ¼Å¸´½ ÆÄÀÏÀÇ ±¸Á¶¸¦ ¾ò°í »ïÂ÷¿ø À¯ÇÑ¿ä¼Ò¸ðÇüÀ» Á¦ÀÛÇÏ¿´´Ù. ´ÏÄÌ Æ¼Å¸´½ ÇÕ±ÝÀÇ ºñ¼±ÇüÀûÀÎ ¹°¸®Àû ¼ºÁúÀ» ¹Ý¿µÇÏ°í ABAQUS ÇÁ·Î±×·¥À» ÀÌ¿ëÇÏ¿© ÈÚ°ú ȸÀü Á¶°Ç ÇÏ¿¡¼­ÀÇ ±â°èÀûÀÎ ¿òÁ÷ÀÓÀ» ¼öÇÐÀûÀ¸·Î ¿¹Ãø ºÐ¼®ÇÏ¿´´Ù. U-ÇüÅÂÀÇ ´Ü¸é ±¸Á¶¸¦ °¡Áø ProFileÀÌ ¸ðÇü °¡¿îµ¥ °¡Àå ÁÁÀº ÈÚ ¼ºÁúÀ» ³ªÅ¸³Â´Ù. µ¿ÀÏÇÑ ÈÚ·® Á¶°Ç¿¡¼­´Â º¼·ÏÇÑ »ï°¢Çü ´Ü¸éÀÇ ProTaper°¡ ´Ù¸¥ ¸ðÇüº¸´Ù ¸¹Àº ÈûÀ» ÇÊ¿ä·Î ÇÏ¿´À¸¸ç, ¹Ý¸é¿¡ °¡Àå ³ôÀº von Mises ÀÀ·ÂÀº ProTaper UniversalÀÇ ´Ü¸é¿¡¼­ ¿òÇ« ÆÄÀÎ ºÎÀ§¿¡ ÁýÁߵǾú´Ù. ProFile ¸ðÇüÀº µ¿ÀÏÇÑ Å©±âÀÇ È¸Àü·Â ¿¡ ´ëÇØ °¡Àå Å« ÀÀ·Â ÁýÁßÀ» U-Çü ±¸ ºÎÀ§¿¡ ³ªÅ¸³Â´Ù. ProTaper ¸ðÇüÀº ´Ù¸¥ ¸ðÇü¿¡ ºñÇØ µ¿ÀÏ·®À» ºñƲ±â À§ÇØ ´õ ¸¹Àº ÈûÀ» ÇÊ¿ä·Î ÇÏ¿´À¸¸ç, ¹Ý¸é¿¡, µ¿·®ÀÇ ºñƲ¸²¿¡¼­´Â °¡Àå ³ôÀº von Mises ÀÀ·ÂÀÌ ProTaper UniversalÀÇ ´Ü¸é¿¡¼­ ¿òÇ« ÆÄÀÎ ºÎÀ§¿¡ ÁýÁߵǾú´Ù.

Flexibility and fracture properties determine the performance of NiTi rotary instruments. The purpose of this study was to evaluate how geometrical differences between three NiTi instruments affect the deformation and stress distributions under bending and torsional conditions using finite element analysis. Three NiTi files (ProFile .06 / #30, F3 of ProTaper and ProTaper Universal) were scanned using a Micro-CT. The obtained structural geometries were meshed with linear, eight-noded hexahedral elements. The mechanical behavior (deformation and von Mises equivalent stress) of the three endodontic instruments were analyzed under four bending and rotational conditions using ABAQUS finite element analysis software. The nonlinear mechanical behavior of the NiTi was taken into account. The U-shaped cross sectional geometry of ProFile showed the highest flexibility of the three file models. The ProTaper, which has a convex triangular cross-section, was the most stiff file model. For the same deflection, the ProTaper required more force to reach the same deflection as the other models, and needed more torque than other models for the same amount of rotation. The highest von Mises stress value was found at the groove area in the cross-section of the ProTaper Universal. Under torsion, all files showed highest stresses at their groove area. The ProFile showed highest von Mises stress value under the same torsional moment while the ProTaper Universal showed the highest value under same rotational angle.

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ÀÀ·Â;´ÏÄÌ-ƼŸ´½ ÆÄÀÏ;Ⱦ´Ü¸é ±¸Á¶;ÈÚ;ºñƲ¸²;À¯ÇÑ¿ä¼Ò
Stress;NiTi rotary instrument;Cross-section;Bending;Torsion;Finite element analysis

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