skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: On the fracture of human dentin: Is it stress- orstrain-controlled?

Abstract

Despite substantial clinical interest in the fracture resistance of human dentin, there is little mechanistic information in archival literature that can be usefully used to model such fracture. In fact, although the fracture event indent in, akin to other mineralized tissues like bone, is widely believed to be locally strain-controlled, there has never been any scientific proof to support this belief. The present study seeks to address this issue through the use of a novel set of in vitro experiments in Hanks' balanced salt solution involving a double-notched bend test geometry, which is designed to discern whether the critical failure events involved in the onset of fracture are locally stress- or strain-controlled. Such experiments are further used to characterize the notion of ''plasticity'' in dentin and the interaction of cracks with the salient microstructural features. It is observed that fracture in dentin is indeed locally strain-controlled and that the presence of dentinal tubules does not substantially affect this process of crack initiation and growth. The results presented are believed to be critical steps in the development of a micromechanical model for the fracture of human dentin that takes into consideration the influence of both the microstructure and the local failuremore » mode.« less

Authors:
; ;
Publication Date:
Research Org.:
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
Sponsoring Org.:
USDOE Director. Office of Science. Office of Basic EnergySciences; National Institutes of Health. National Institute of Dental andCraniofacial Research Grant P01DE09859
OSTI Identifier:
890621
Report Number(s):
LBNL-51378
R&D Project: 511906; BnR: KC0201020; TRN: US200620%%760
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Biomed Materials Research; Journal Volume: 67A; Journal Issue: 67A; Related Information: Journal Publication Date: 2003
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DENTIN; FRACTURES; GEOMETRY; IN VITRO; MICROSTRUCTURE; PLASTICITY; TUBULES; dentin fracture double notch bend test

Citation Formats

Nalla, R.K., Kinney, J.H., and Ritchie, R.O. On the fracture of human dentin: Is it stress- orstrain-controlled?. United States: N. p., 2006. Web.
Nalla, R.K., Kinney, J.H., & Ritchie, R.O. On the fracture of human dentin: Is it stress- orstrain-controlled?. United States.
Nalla, R.K., Kinney, J.H., and Ritchie, R.O. Wed . "On the fracture of human dentin: Is it stress- orstrain-controlled?". United States. doi:. https://www.osti.gov/servlets/purl/890621.
@article{osti_890621,
title = {On the fracture of human dentin: Is it stress- orstrain-controlled?},
author = {Nalla, R.K. and Kinney, J.H. and Ritchie, R.O.},
abstractNote = {Despite substantial clinical interest in the fracture resistance of human dentin, there is little mechanistic information in archival literature that can be usefully used to model such fracture. In fact, although the fracture event indent in, akin to other mineralized tissues like bone, is widely believed to be locally strain-controlled, there has never been any scientific proof to support this belief. The present study seeks to address this issue through the use of a novel set of in vitro experiments in Hanks' balanced salt solution involving a double-notched bend test geometry, which is designed to discern whether the critical failure events involved in the onset of fracture are locally stress- or strain-controlled. Such experiments are further used to characterize the notion of ''plasticity'' in dentin and the interaction of cracks with the salient microstructural features. It is observed that fracture in dentin is indeed locally strain-controlled and that the presence of dentinal tubules does not substantially affect this process of crack initiation and growth. The results presented are believed to be critical steps in the development of a micromechanical model for the fracture of human dentin that takes into consideration the influence of both the microstructure and the local failure mode.},
doi = {},
journal = {Journal of Biomed Materials Research},
number = 67A,
volume = 67A,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2006},
month = {Wed Feb 01 00:00:00 EST 2006}
}