Journal of Technologic Dentistry (대한치과기공학회지)

Korean Academy of Dental Technology (대한치과기공학회)
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Influence of zirconia and titanium fixture materials on stress distribution in abutment screws: a three-dimensional finite element analysis

지르코니아 및 티타늄 고정체 소재가 지대주 나사의 응력 분포에 미치는 영향: 3차원 유한 요소 분석

  • Kim, Eun Young (Department of Dental Laboratory Science, College of Health Sciences, Catholic University of Pusan) ;
  • Hong, Min-Ho (Department of Dental Laboratory Science, College of Health Sciences, Catholic University of Pusan)
  • 김은영 (부산가톨릭대학교 보건과학대학 치기공학과) ;
  • 홍민호 (부산가톨릭대학교 보건과학대학 치기공학과)
  • Received : 2021.03.04
  • Accepted : 2021.05.14
  • Published : 2021.06.30
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Abstract

Purpose: The purpose of this study was to evaluate the stability of abutment screws used with the zirconia fixture-based implant system and compare them with those used with the existing titanium fixture system via the finite element method. Methods: A single implant-supported restoration was designed for the finite element analysis. A universal analysis program was used to set 8 occlusal points along the direction to the long axis of the implant, and an occlusal load of 700 N was applied. Results: In all models (Zir and Ti-fixture model), the screw threads presented with the highest von Mises stress (VMS) values, whereas the head and end presented with the lowest VMS values. The VMS of the screw used in the zirconia-fixture model was 5.97% lower than that used in the titanium-fixture model (261.258 vs. 276.911 MPa, respectively) despite statistical significance. Furthermore, the zirconia fixture (352.912 MPa) had a higher stress value (8.42%) than the titanium fixture (332.331 MPa). In a completely tightened titanium fixture implant system, the stress was concentrated in the implant-abutment connection interface, the zirconia fixture presented with a stable stress distribution. Conclusion: Although the zirconia fixture demonstrated a high VMS value, owing to the stiffness and elasticity coefficients of the material, the stress generated in the abutment screws was similar in all models. In conclusion, the zirconia fixture-based implant system presented with a more stable stress distribution in the abutment screws than the titanium fixture-based implant system.

Keywords

Acknowledgement

This work was supported by the technology development program (grant number S2910908) funded by the Ministry of SMEs and Startups (MSS, Korea) and research fund offered from Catholic University of Pusan.

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