Journal of the Korean Academy of Esthetic Dentistry (대한심미치과학회지)

Korean Academy of Esthetic Dentistry (대한심미치과학회)
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A Preliminary study of Biomechanical Behavior of High-Performance Polymer Post-Core System

고성능 폴리머 재질의 포스트-코어 시스템의 생역학적 거동에 대한 예비실험

  • Lee, Ki-Sun (Department of Prosthodontics, Korea University Ansan Hospital) ;
  • Kim, Jong-Eun (Department of Prosthodontics, College of Dentistry, Yonsei University) ;
  • Kim, Jee-Hwan (Department of Prosthodontics, College of Dentistry, Yonsei University) ;
  • Lee, Jeong-Yol (Department of Prosthodontics, Korea University Guro Hospital) ;
  • Shin, Sang-Wan (Korea University Medical Center)
  • 이기선 (고려대학교 안산병원 치과-보철과) ;
  • 김종은 (연세대학교 치과병원 보철과) ;
  • 김지환 (연세대학교 치과병원 보철과) ;
  • 이정열 (고려대학교 구로병원 치과-보철과) ;
  • 신상완 (고려대학교 의료원)
  • Received : 2018.08.28
  • Accepted : 2018.11.05
  • Published : 2018.12.17
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Abstract

The aim of this study was to evaluate the biomechanical behavior and long-term safety of high performance polymer PEKK as an intraradicular dental post-core material through comparative finite element analysis (FEA) with other conventional post-core materials. A 3D FEA model of a maxillary central incisor was constructed. A cyclic loading force of 50 N was applied at an angle of $45^{\circ}$ to the longitudinal axis of the tooth at the palatal surface of the crown. For comparison with traditionally used post-core materials, three materials (gold, fiberglass, and PEKK) were simulated to determine their post-core properties. PEKK, with a lower elastic modulus than root dentin, showed comparably high failure resistance and a more favorable stress distribution than conventional post-core material. However, the PEKK post-core system showed a higher probability of debonding and crown failure under long-term cyclic loading than the metal or fiberglass post-core systems.

본 연구의 목적은 기존의 다른 포스트-코어 재료와의 유한요소분석(FEA)의 비교를 통한 치과용 포스트-코어 재료로서의 고성능 폴리머 PEKK의 생체역학 및 장기 안전성을 평가하는 데 있다. 상악 중절치를 모델링 하였으며, 구개 표면에서 치아의 장축에 $45^{\circ}$의 각도로 50N의 반복 하중을 가했다. 전통적으로 사용 된 포스트 코어 재료와 비교하기 위해 3가지 재료 (금, 유리 섬유 및 PEKK)를 시뮬레이션하여 결과를 상호 비교 해 보았다. 상아질보다 낮은 탄성 계수를 갖는 PEKK는 종래의 포스트 코어 재료보다 비교적 치근에 유리한 응력 분포를 보여 주었다. 그러나, PEKK 포스트-코어 시스템은 금속 또는 유리 섬유 포스트-코어 시스템보다 장기간의 반복하중에 대해 타락 및 크라운 파손의 가능성이 더 높을 가능성이 있다.

Keywords

HSMCB1_2018_v27n2_75_f0001.png 이미지

Fig 1. 포스트-코어시스템을 가지는 치아에 대한 가상 모델링. 좌측은 포스트와 코어가 일체형인 시스템에 대한 모델링. 우측은 포스트와 코어가 일체형이 아닌 시스템에 대한 모델링

HSMCB1_2018_v27n2_75_f0002.png 이미지

Fig 2. 각 실험군의 Maximum von Misses stress 분포 및 결과 비교

Table1. 유한요소 분석에 사용된 재질의 역학적 설정값

HSMCB1_2018_v27n2_75_t0001.png 이미지

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