Nanoscopic dynamic mechanical properties of intertubular and peritubular dentin

Abstract

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 if their response is frequency dependent. Specimens of hydrated coronal dentin were evaluated by DMA using single indents over a range in 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 quantities of 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. Though 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 quasi-static indentation loads and the highest frequency.

Long-term effect of Er:YAG laser on adhesion to caries-affected dentin

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Mechanical benefits of conservative restoration for dental fissure caries

“…Such an additional benefit underpins the advantages of biomechanics and endorses, that not only does the minimally invasive restorative clinical technique provide a higher remineralization potential for restoring dentine tissue and its functionality, but also better integrity and load bearing capacity of restored tooth structure. (Hidehiko Watanabe, 2008;Nanako Iwamoto, 2003;Pugach et al, 2009;Ryou et al, 2012). …”

“…Material properties as used in this study(Hidehiko Watanabe, 2008;Nanako Iwamoto, 2003;Pugach et al, 2009;Ryou et al, 2012).…”

Nanomechanical properties, SEM, and EDS microanalysis of dentin treated with 2.5% titanium tetrafluoride, before and after an erosive challenge

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