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Stress distribution of implants with external and internal connection design: a 3-D finite element analysis

내측 연결 및 외측 연결 방식으로 설계된 임플란트의 3차원적 유한요소 응력 분석

  • Chung, Hyunju (Department of Periodontology, School of Dentistry, Chonnam National University) ;
  • Yang, Sung-Pyo (Department of Bio and Brain Engineering, KAIST) ;
  • Park, Jae-Ho (Department of Prosthodontics, School of Dentistry, Chonnam National University) ;
  • Park, Chan (Department of Prosthodontics, School of Dentistry, Chonnam National University) ;
  • Shin, Jin-Ho (Department of Prosthodontics, School of Dentistry, Chonnam National University) ;
  • Yang, Hongso (Department of Prosthodontics, School of Dentistry, Chonnam National University)
  • 정현주 (전남대학교 치과대학 치주과) ;
  • 양성표 (카이스트 생체 및 뇌공학과) ;
  • 박재호 (전남대학교 치과대학 보철과) ;
  • 박찬 (전남대학교 치과대학 보철과) ;
  • 신진호 (전남대학교 치과대학 보철과) ;
  • 양홍서 (전남대학교 치과대학 보철과)
  • Received : 2017.08.08
  • Accepted : 2017.09.01
  • Published : 2017.09.30

Abstract

Purpose: This study aims to analyze the stress distribution of mandibular molar restoration supported by the implants with external hex and internal taper abutment connection design. Materials and Methods: Models of external connection (EXHEX) and internal connection (INCON) implants, corresponding abutment/crowns, and screws were developed. Supporting edentulous mandibular bony structures were designed. All the components were assembled and a finite element analysis was performed to predict the magnitude and pattern of stresses generated by occlusal loading. A total of 120 N static force was applied both by axial (L1) and oblique (L2) direction. Results: Peak von Mises stresses produced in the implants by L2 load produced 6 - 15 times greater than those by L1 load. The INCON model showed 2.2 times greater total amount of crown cusp deflection than the EXHEX model. Fastening screw in EXHEX model and upside margin of implant fixture in INCON model generated the peak von Mises stresses by oblique occlusal force. EXHEX model and INCON model showed the similar opening gap between abutment and fixture, but intimate sealing inside the contact interface was maintained in INCON model. Conclusion: Oblique force produced grater magnitudes of deflection and stress than those by axial force. The maximum stress area at the implant was different between the INCON and EXHEX models.

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