Earticle

초록

영어

Purpose: This study aimed to quantitatively compare the stress sensitivity of cortical and cancellous bones under varying preload torques and loading directions in zirconia abutment implant systems by finite-element analysis. Methods: A three-dimensional finite-element model of a mandibular implant system was developed, comprising a zirconia abutment, a Ti-6Al-4V screw and fixture, and surrounding bone structures. The model assumed complete osseointegration and linear elastic properties. Three torque conditions (10, 20, and 30 N·cm) and two loading angles (30° oblique, 90° vertical) with a 175 N occlusal force were applied. To assess stress sensitivity, maximum principal stress was measured in the cortical and cancellous bones across all scenarios. Results: The cortical bone consistently exhibited higher absolute stress values than the cancellous bone. However, the cancellous bone showed a markedly greater increase in stress between 20 and 30 N·cm torque, particularly under oblique loading (30°), with the stress increasing by >59.2%. In contrast, the cortical bone demonstrated a more gradual and linear stress response. Both bone types showed intensified stress concentrations at high torque levels and under oblique loading, suggesting increased mechanical vulnerability in the cancellous bone. Conclusion: The cancellous bone is more sensitive to preload torque and loading direction changes than the cortical bone in zirconia abutment systems. This finding underscores the need for cautious torque applications and stress-distributing prosthetic designs, particularly in areas with poor bone quality.

목차

Abstract
INTRODUCTION
MATERIALS AND METHODS
1. 유한요소 모델 설계 및 경계 조건 설정
2. 하중 및 조임 토크 조건
3. 유한요소해석 및 응력 분석
RESULTS
DISCUSSION
CONCLUSIONS
FUNDING
ACKNOWLEDGEMENTS
CONFLICT OF INTEREST
ORCID
REFERENCES

키워드

저자

• 김성민 [ Sung-Min Kim | 진주보건대학교 치기공과 ] Corresponding Author

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  대한치과기공학회지 [THE JOURNAL OF KOREAN ACADEMY OF DENTAL TECHNOLOGY]

• 간기

  계간

• pISSN

  1229-3954

• eISSN

  2288-5218

• 수록기간

  1979~2026

• 등재여부

  KCI 등재

• 십진분류

  KDC 515 DDC 617