Dynamic shear modulus in torsion of human dentin and enamel

Dental Materials Journal
H Arikawa

Abstract

The dynamic shear moduli of human dentin and enamel were measured using a torsion pendulum over a temperature range from 23 to 150 degrees C. For dentin, the shear modulus slightly increased for temperatures near 50 to 100 degrees C, which was caused by a loss of free water. The peak in the loss tangent was observed near 75 degrees C. The shear moduli at 37 degrees C for sixty coronal dentin specimens ranged from 5.77 X 10(10) to 1.16 X 10(11) dyn/cm2. For enamel, the shear modulus and the loss tangent were markedly stable and independent of the temperature. The shear moduli at 37 degrees C for forty specimens ranged from 2.35 X 10(11) to 4.48 X 10(11) dyn/cm2. Enamel had a modulus which was approximately three to five times higher, and a lower loss tangent than those of dentin. For both dentin and enamel, there were no significant correlations between the values of the shear modulus and sex, age or tooth type.

Citations

May 15, 2003·Computer Methods in Biomechanics and Biomedical Engineering·Pierre HubschJeremy Knox
Aug 19, 2007·The Journal of Prosthetic Dentistry·Beata DejakMaciej Romanowicz
Nov 18, 2005·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Fernanda Tranchesi SadekPaulo Eduardo Capel Cardoso
Oct 17, 2001·International Endodontic Journal·N P ChandlerT F Watson

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