Importance of age on the dynamic mechanical behavior of intertubular and peritubular dentin

Heonjune Ryou, Elaine Romberg, David H. Pashley, Franklin Chi Meng Tay, Dwayne Arola

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

An experimental evaluation of human coronal dentin was performed using nanoscopic dynamic mechanical analysis (nanoDMA). The primary objectives were to quantify any unique changes in mechanical behavior of intertubular and peritubular dentin with age, and to evaluate the microstructure and mechanical behavior of the mineral deposited within the lumens. Specimens of coronal dentin were evaluated by nanoDMA using single indents and in scanning mode via scanning probe microscopy. Results showed that there were no significant differences in the storage modulus or complex modulus between the two age groups (18-25 versus 54-83. yrs) for either the intertubular or peritubular tissue. However, there were significant differences in the dampening behavior between the young and old dentin, as represented in the loss modulus and tan. δ responses. For both the intertubular and peritubular components, the capacity for dampening was significantly lower in the old group. Scanning based nanoDMA showed that the tubules of old dentin exhibit a gradient in elastic behavior, with decrease in elastic modulus from the cuff to the center of tubules filled with newly deposited mineral.

Original languageEnglish (US)
Pages (from-to)229-242
Number of pages14
JournalJournal of the Mechanical Behavior of Biomedical Materials
Volume42
DOIs
StatePublished - Feb 1 2015

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Keywords

  • Aging
  • Dentin
  • Dynamic mechanical analysis (DMA)
  • Elastic modulus
  • Nanoindentation

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering
  • Mechanics of Materials

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