Journal
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
Volume 7, Issue -, Pages 3-16Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmbbm.2011.08.010
Keywords
Dentin; Dynamic Mechanical Analysis (DMA); Elastic modulus; Nanoindentation
Funding
- NIDCR NIH HHS [R01 DE015306-06, R01 DE016904-04, R01 DE015306, R21 DE019213, R01 DE016904, R21 DE019213-01, R21 DE019213-02, R01 DE016904-04S1] Funding Source: Medline
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An experimental evaluation of intertubular and peritubular dentin was performed using nanoindentation and Dynamic Mechanical Analysis (DMA). The objective of the investigation was to evaluate the differences in dynamic mechanical behavior of these two constituents and to assess whether their response is frequency dependent. Specimens of hydrated coronal dentin were evaluated by DMA using single indents over a range of parametric conditions and using scanning probe microscopy. The complex (E*), storage (E') and loss moduli (E) of the intertubular and peritubular dentin were evaluated as a function of the dynamic loading frequency and static load in the fully hydrated condition. The mean complex E* (19.6 GPa) and storage E' (19.2 GPa) moduli of the intertubular dentin were significantly lower than those for peritubular dentin (E* = 31.1 GPa, p < 0.05; E' = 30.3 GPa, p < 0.05). There was no significant influence of dynamic loading frequency on these measures. Although there was no significant difference in the loss modulus (E) between the two materials (p > 0.05), both constituents exhibited a significant increase in E with dynamic load frequency and reduction in the quasi-static component of indentation load. The largest difference in dynamic behavior of the two tissues was noted at small quasistatic indentation loads and the highest frequency. (C) 2011 Elsevier Ltd. All rights reserved.
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