PMID: 11332531May 3, 2001Paper

Anisotropy of tensile strength of root dentin

Journal of Dental Research
V LertchirakarnHarold H Messer

Abstract

An effect of dentinal tubule orientation on mechanical properties of dentin has been difficult to demonstrate. We have tested the hypothesis that ultimate tensile strength (UTS) of dentin is affected by tubule (and hence collagen fibril) orientation. The UTS of human root dentin was investigated by direct tensile and diametral testing of specimens of known orientation prepared from extracted teeth. Dumbbell-shaped samples were machined for direct tensile testing (load parallel or perpendicular to tubule direction) and cylinders for diametral testing (load at 0 degrees, 45 degrees, 67.5 degrees, and 90 degrees). Fractured surfaces were examined by SEM. UTS was lowest when the tensile force was parallel to tubule orientation, and greatest at 90 degrees to tubule orientation (fracture parallel to tubule direction). SEM views of fractured surfaces suggested that microstructure contributes to fracture patterns. At least for properties involving disruption of the collagen matrix, root dentin shows a definite anisotropy.

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Citations

Jul 13, 2002·Journal of Biomedical Materials Research·Michal StaninecJohn H Kinney
Apr 2, 2011·Journal of Materials Science. Materials in Medicine·H RyouD Arola
Jun 24, 2004·Dental Materials : Official Publication of the Academy of Dental Materials·Francesco MannocciTimothy F Watson
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