Importance of Aging to the Dehydration Shrinkage of Human Dentin

WANG Rao-rao; MAO Shuang-shuang; Elaine Romberg; Dwayne Arola; ZHANG Dong-sheng

doi:10.3879/j.issn.1000-0887.2012.03.005

Volume 33 Issue 3

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Article Navigation > Applied Mathematics and Mechanics > 2012 > 33(3): 320-331

WANG Rao-rao, MAO Shuang-shuang, Elaine Romberg, Dwayne Arola, ZHANG Dong-sheng. Importance of Aging to the Dehydration Shrinkage of Human Dentin[J]. Applied Mathematics and Mechanics, 2012, 33(3): 320-331. doi: 10.3879/j.issn.1000-0887.2012.03.005

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Importance of Aging to the Dehydration Shrinkage of Human Dentin

doi: 10.3879/j.issn.1000-0887.2012.03.005

1.
¹Tenth People’s Hospital of Tongji University, Shanghai 200072, P.R.China;²Department of Mechanics, Shanghai University, Shanghai 200444, P.R.China;³Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai 200072, P.R.China;⁴Department of Health Promotion and Policy Baltimore College of Dental Surgery, University of Maryland, Baltimore, MD 21201;⁵Department of Mechanical Engineering, University of Maryland Baltimore County, Baltimore, MD 21201;⁶Department of Endodontics, Prosthodontics, and Operative Dentistry Baltimore College of Dental Surgery, University of Maryland, Baltimore, MD 21201

Received Date: 2011-12-23
Rev Recd Date: 2012-01-13
Publish Date: 2012-03-15

Abstract

Abstract

There was an increase in the mineral content of human dentin with aging. Due to the consequent changes in mineral to collagen ratio, this process may influence the degree of hydrogen bonding that occurs with loss of water and the extent of shrinkage as a result of dehydration. Thus, the objective of this investigation was to quantify the differences in dehydration shrinkage of human dentin with patient age. Specimens of coronal dentin were prepared from the molars of young (23≤age≤34) and old (52≤age≤62) patients and then maintained in storage solutions of water or Hanks balanced salt solution(HBSS). Dimensional changes of the dentin specimens occurring over periods of free convection were evaluated using microscopic digital image correlation(DIC). Results distinguished that the shrinkage of young dentin is significantly larger than that for old dentin, regardless of orientation and period of storage (p<0.01).Strains parallel to the tubules increased with proximity to the dentin enamel junction(DEJ) whereas the shrinkage strains in the transverse direction were largest in deep dentin (i.e. near the pulp). The degree of anisotropy in shrinkage increased from the pulp to the DEJ and was largest in young dentin.
- dentin,
- DIC,
- mineral content,
- sclerosis,
- shrinkage

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References(39)

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