Journal
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
Volume 150, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jmbbm.2023.106225
Keywords
Fracture resistance (FR); Fracture toughness (FT); Peritubular dentin (PTD); Intertubular dentin (ITD); Finite element analysis (FEA)
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This study reveals the adverse effect of acid on dentin in terms of degradation of its fracture toughness. The peritubular dentin plays a significant role in enhancing the dentin's fracture resistance capability. The findings highlight the importance of structural integrity for dentin.
Human dentin is known for its hierarchical structure through long-term evolution. Dental caries, embodied by dentin demineralization, is ascribed to a different reaction between peritubular dentin (PTD) and intertubular dentin (ITD) to acid dissolution. This study sheds light on the adverse effect of acid on dentin in terms of degradation of its fracture toughness (FT) due to the acid dissolution-induced corrosion of PTD. A scanning electronic microscope (SEM) is utilized to visualize the difference between normal and acid-treated dentin subjected to the same loading method in terms of crack propagation performance. 3D simulative representative volume elements (RVEs) are developed to analyze the effect of PTD missing on the performance of dentin fracture resistance (FR). The results indicate PTD plays a significant role in enhancing dentin FR capability and thus reveals the importance of structural integrity for dentin.
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