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Applied Mathematics and Mechanics (English Edition) ›› 2012, Vol. 33 ›› Issue (3): 333-344.doi: https://doi.org/10.1007/s10483-012-1553-8

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Importance of aging to dehydration shrinkage of human dentin

汪饶饶1，毛霜霜2,3，E.ROMBERG4，D. AROLA5,6，张东升2,3   

  1. 1. Department of Stomatology, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, Shanghai 200072, P. R. China;
    2. Department of Mechanics, Shanghai University, Shanghai 200444, P. R. China;
    3. Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai 200072, P. R. China;
    4. Department of Health Promotion and Policy Baltimore, College of Dental Surgery, University of Maryland, Baltimore, MD 21201, USA;
    5. Department of Mechanical Engineering, University of Maryland, Baltimore County, Baltimore, MD 21250, USA;
    6. Department of Endodontics, Prosthodontics, and Operative Dentistry Baltimore, University of Maryland, Baltimore, MD 21201, USA
  • 收稿日期:2011-12-23 修回日期:2012-01-12 出版日期:2012-03-02 发布日期:2012-03-01

Importance of aging to dehydration shrinkage of human dentin

WANG Rao-Rao1, MAO Shuang-Shuang2,3, E.ROMBERG4, D. AROLA5,6, ZHANG Dong-Sheng2,3   

  1. 1. Department of Stomatology, Shanghai Tenth People’s Hospital, Tongji University School of Medicine, Shanghai 200072, P. R. China;
    2. Department of Mechanics, Shanghai University, Shanghai 200444, P. R. China;
    3. Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai 200072, P. R. China;
    4. Department of Health Promotion and Policy Baltimore, College of Dental Surgery, University of Maryland, Baltimore, MD 21201, USA;
    5. Department of Mechanical Engineering, University of Maryland, Baltimore County, Baltimore, MD 21250, USA;
    6. Department of Endodontics, Prosthodontics, and Operative Dentistry Baltimore, University of Maryland, Baltimore, MD 21201, USA
  • Received:2011-12-23 Revised:2012-01-12 Online:2012-03-02 Published:2012-03-01

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摘要： There is an increase in the mineral content of human dentin with aging. Due to the consequent changes in the mineral to the collagen ratio, this process may influence the degree of hydrogen bonding that occurs with the loss of water and the extent of shrinkage as a result of dehydration. Thus, the objective of this investigation is to quantify the differences in the dehydration shrinkage of human dentin with patient age. Specimens of coronal dentin are 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 solutions (HBSS). Dimensional changes of the dentin specimens occurring over periods of free convection are evaluated by using the microscopic digital image correlation (DIC). The results distinguish that the shrinkage of the young dentin is significantly larger than that of the old dentin, regardless of the orientation and period of the storage. The strains parallel to the tubules increase with proximity to the dentin enamel junction (DEJ), whereas the shrinkage strains in the transverse direction are the largest in the deep dentin (i.e., near the pulp). The degree of anisotropy in the shrinkage increases from the pulp to the DEJ, and is the largest in the young dentin.

Abstract: There is an increase in the mineral content of human dentin with aging. Due to the consequent changes in the mineral to the collagen ratio, this process may influence the degree of hydrogen bonding that occurs with the loss of water and the extent of shrinkage as a result of dehydration. Thus, the objective of this investigation is to quantify the differences in the dehydration shrinkage of human dentin with patient age. Specimens of coronal dentin are 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 solutions (HBSS). Dimensional changes of the dentin specimens occurring over periods of free convection are evaluated by using the microscopic digital image correlation (DIC). The results distinguish that the shrinkage of the young dentin is significantly larger than that of the old dentin, regardless of the orientation and period of the storage. The strains parallel to the tubules increase with proximity to the dentin enamel junction (DEJ), whereas the shrinkage strains in the transverse direction are the largest in the deep dentin (i.e., near the pulp). The degree of anisotropy in the shrinkage increases from the pulp to the DEJ, and is the largest in the young dentin.

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