Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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STRESS DISTRIBUTION FOR NITI FILES OF TRIANGULAR BASED AND RECTANGULAR BASED CROSS-SECTIONS USING 3-DIMENSIONAL FINITE ELEMENT ANALYSIS

만곡 근관에서 삼각 혹은 장방형 단면 구조의 니켈-티타늄 파일 응력 분포에 관한 3차원 유한요소 연구

  • Kim, Hyun-Ju (Department of Conservative Dentistry, School of Dentistry) ;
  • Lee, Chan-Joo (Division of Precision Manufacturing Systems, Pusan National University) ;
  • Kim, Byung-Min (Division of Precision Manufacturing Systems, Pusan National University) ;
  • Park, Jeong-Kil (Department of Conservative Dentistry, School of Dentistry) ;
  • Hur, Bock (Department of Conservative Dentistry, School of Dentistry) ;
  • Kim, Hyeon-Cheol (Department of Conservative Dentistry, School of Dentistry)
  • 김현주 (부산대학교 치의학전문대학원 치과보존학교실) ;
  • 이찬주 (부산대학교 공과대학 기계공학부) ;
  • 김병민 (부산대학교 공과대학 기계공학부) ;
  • 박정길 (부산대학교 치의학전문대학원 치과보존학교실) ;
  • 허복 (부산대학교 치의학전문대학원 치과보존학교실) ;
  • 김현철 (부산대학교 치의학전문대학원 치과보존학교실)
  • Published : 2009.01.30
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Abstract

The purpose of this study was to compare the stress distributions of NiTi rotary instruments based on their cross-sectional geometries of triangular shape-based cross-sectional design, S-shaped cross-sectional design and modified rectangular shape-based one using 3D FE models. NiTi rotary files of S-shaped and modified rectangular design of cross-section such as Mtwo or NRT showed larger stress change while file rotation during simulated shaping. The stress of files with rectangular cross-section design such as Mtwo, NRT was distributed as an intermittent pattern along the long axis of file. On the other hand, the stress of files with triangular cross-section design was distributed continuously. When the residual stresses which could increase the risk of file fatigue fracture were analyzed after their withdrawal. the NRT and Mtwo model also presented higher residual stresses. From this result, it can be inferred that S-shaped and modified rectangular shape-based files were more susceptible to file fracture than the files having triangular shape-based one.

이 연구의 목적은 3차원 유한요소 모형 분석을 이용하여 삼각 대칭형과 5형태의 단면 및 변형된 사각 형태인 장방형 단면으로 분류되는 네 종류의 니켈티타늄 파일이 만곡 근관 적용 시의 응력 분포를 비교하는 것이다. 삼각 대칭형 단면 구조의 ProFile #30 / .06과 Heroshaper #30 / .06, 장방형 단면구조의 Mtwo #30 / .05와 NRT #30/ .06 파일을 마이크로컴퓨터 단층촬영을 하고 reverse engineering을 통하여 파일의 구조를 얻고 삼차원 유한요소모형을 제작하였다. 모형 근관 내에서 파일이 근관장끝까지 진입하여 회전할 때 발생하는von Mises 응력 분포 및 파일의 제거후의 잔류 음력의 분포양상을 ABAQUS 프로그램을 이용하여 비교하였다. 근관 내 회전 시에 발생하는 응력을 관찰하였을 때 NRT 파일에서 가장 큰 응력을 나타냈으며, 각 파일에서의 최고 응력과 최저 응력을 비교하였을 때 Mtwo파일에서 가장 큰 차이가 나타났다. 응력의 내부 분포 경향을 보았을 때 장방형 구조의 단면을 가진 Mtwo 및 NRT 파일에서 불연속적인 응력의 집중 부위가 관찰되었으며, 근관 외부로 파일을 제거하여 탄성 회복이 일어난 후의 잔류 응력도 NRT 파일에서 가장 높게 나타났다. 이상의 결과로 유추할 때, 삼각대칭 단면 구조를 가진 파일보다 S-형태의 단면과 변형된 사각 형태의 단면 등의 장방형 단면 구조의 파일이 파절의 위험성이 더 클 것으로 사료된다.

Keywords

References

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