Regional Variation of Human Mandibular Subchondral Bone Tissue Properties (original) (raw)

Abstract

Objective: The temporomandibular joint (TMJ) bears different types of static and dynamic loading during occlusion and mastication. The objective of this study was to examine whether local mechanical properties of mandibular condyle bone tissue vary resulting from its functional adaptation to loading at TMJ. Method: Subchondral and trabecular bone was dissected from mandibular condyles of human cadavers (8 males and 3 females, 54 to 96 years). The surface of specimens was polished for nanoindentation that was conducted in hydration using the corresponding displacement rate of 10 nm/sec up to 500 nm depth. Nanoindentation viscoelastic tangent delta (tan δ) was assessed using averaged phase angle (δ) under oscillatory loading. Plastic hardness (H), viscosity (η), and elastic modulus (E) were obtained at peak load, creep during the 30-second hold period, and unloading processes in a cycle of indentation, respectively. A total of 504 indentations (221 from upper and 114 from lower subcho...

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