Stress intensity factor of a cracked molar restored with different materials and designs: A 3D-FEA. (June 2023)

• Record Type: Journal Article
• Authors: Jiang, Jingang; Sun, Jianpeng; Ma, Hongyuan; Wang, Jingchao; Huang, Zhiyuan; Zhou, Shan
• Is Part Of: Journal of the mechanical behavior of biomedical materials. Volume 142(2023)
• Publication Date: 2023-06
• Subjects: Cracked tooth -- Finite element analysis -- Cracked propagation -- Stress intensity factor -- Restoration design -- Crown parameters; Biomedical materials -- Periodicals; Biomedical materials -- Mechanical properties -- Periodicals; Biomedical materials; Biomedical materials -- Mechanical properties; Periodicals; Electronic journals; 610.28
• DOI: 10.1016/j.jmbbm.2023.105818
• Languages: English
• ISSNs: 1751-6161

Abstract

Abstract: Objective: This work used 3D finite element analysis (FEA) to analyze and directly compare the stress intensity factor (SIF) and stress distribution at the crack tip of identical cracked tooth models restored with different materials and crown parameters. Methods: A 3D model of the cracked tooth was generated. Then, we applied 25 restorative models, including three parameters (shoulder height, width, and degree of polymerization), five restorative materials (GC, IPS, LU, ZC, VE), and two combinations of types of cement (RMGIC and GIC). An occlusal load of 800N was applied to the spherical part along the longitudinal axis. The stress distribution of the preparation and the SIF of the crack tip was analyzed. Results: The crack tip SIF was minimal for a shoulder height offset of 0.8 mm (P = 0.032), a shoulder width of 0.6 mm (P = 0.045), a crown material of ZC (P < 2e-16), and a cement material of RMGIC (P < 0.05), respectively. In contrast, the effect of different polymerization degrees on SIF was insignificant (P = 0.95). Conclusion: Our results suggest that the selection of a larger modulus of elasticity (MOE) material for the crown, the preparation of a smaller shoulder width within a safe range, a reasonable increase in the crown length, and the selection of adhesive materials with high fracture toughness are favorable methods to prevent further crack extension.