Determination of fracture toughness of human permanent and primary enamel using an indentation microfracture method

Sachiko Hayashi-Sakai, Jun Sakai, Makoto Sakamoto, Hideaki Endo

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The purpose of the present study was to examine the fracture toughness and Vickers microhardness number of permanent and primary human enamel using the indentation microfracture method. Crack resistance and a parameter indirectly related to fracture toughness were measured in 48 enamel specimens from 16 permanent teeth and 12 enamel specimens obtained from six primary teeth. The Vickers microhardness number of the middle portion was greater than the upper portion in primary enamel. The fracture toughness was highest in the middle portion of permanent enamel, because fracture toughness greatly depends upon microstructure. These findings suggest that primary teeth are not miniature permanent teeth but have specific and characteristic mechanical properties.

Original languageEnglish
Pages (from-to)2047-2054
Number of pages8
JournalJournal of Materials Science: Materials in Medicine
Volume23
Issue number9
DOIs
Publication statusPublished - 2012 Sep

ASJC Scopus subject areas

  • Biophysics
  • Bioengineering
  • Biomaterials
  • Biomedical Engineering

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