In silico fatigue performance of molars restored with full crowns under alternating cyclic loadings

Jingang Jiang; Jianpeng Sun; Hongyuan Ma; Shan Zhou

doi:10.1016/j.jmbbm.2023.105946

In silico fatigue performance of molars restored with full crowns under alternating cyclic loadings

J Mech Behav Biomed Mater. 2023 Aug:144:105946. doi: 10.1016/j.jmbbm.2023.105946. Epub 2023 Jun 22.

Authors

Jingang Jiang¹, Jianpeng Sun², Hongyuan Ma³, Shan Zhou⁴

Affiliations

¹ Robotics & Its Engineering Research Center, Harbin University of Science and Technology, Harbin, 150080, PR China; Key Laboratory of Advanced Manufacturing and Intelligent Technology, Ministry of Education, Harbin University of Science and Technology, Harbin, 150080, Heilongjiang, PR China. Electronic address: jiangjingang@hrbust.edu.cn.
² Robotics & Its Engineering Research Center, Harbin University of Science and Technology, Harbin, 150080, PR China.
³ Harbin Branch of Taili Communication Technology Limited, China Electronics Technology Group Corporation, Harbin, 150080, Heilongjiang, PR China.
⁴ The Second Affiliated Hospital of Harbin Medical University, Harbin, 150081, Heilongjiang, PR China.

PMID: 37369171
DOI: 10.1016/j.jmbbm.2023.105946

Abstract

Objective: In this study, a preclinical approach was used to analyze and directly compare the fatigue performance (fatigue life and damage percentage) and maximum principal stresses (Max. Ps) of prepared models treated with different materials and geometric parameters.

Methods: Four groups of preparative parameters (crown width, crown length, degree of polymerization and material) were selected, each with five variables. An alternating cyclic occlusal load with an amplitude of 300 N was applied to the ball part along the longitudinal axis. The fatigue properties of the preparations and Max.Ps were analyzed.

Results: A shoulder width of 0.8 mm, a shoulder height offset of 0.2 mm, a degree of polymerization of 5°, and a crown material of ZC resulted in the smallest percentage of damage. In contrast, the effect of different modulus of elasticity (MOE) on Max.Ps was not significant (p = 0.609).

Conclusion: The results suggest that the selection of larger modulus of elasticity MOE and larger Poisson's ratio material's, preparation of larger shoulder widths within safety, reasonable increase in crown length, and selection of larger degree of polymerization are favorable methods to protect the preparation.

Keywords: Alternating cyclic loadings; Crown parameters; Fatigue properties; Finite element analysis; Restoration design.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Ceramics
Crowns*
Dental Porcelain
Dental Stress Analysis
Elasticity
Finite Element Analysis
Materials Testing
Molar*

Substances

Dental Porcelain