Effect of depth and tubule direction on ultimate tensile strength of human coronal dentin

Satoshi Inoue, Patricia N.R. Pereira, Chiharu Kawamoto, Masatoshi Nakajima, Kenichi Koshiro, Junji Tagami, Ricardo M. Carvalho, David H. Pashley, Hidehiko Sano

Research output: Contribution to journalArticlepeer-review

58 Scopus citations


The purpose of this study was to evaluate the effect of dentin depth and tubule direction on the ultimate tensile strength (UTS) of human dentin. Dentin slabs of 0.5-mm thickness were trimmed either from the mesial and distal (for specimens with the tubules parallel to the tensile force; parallel group) or from the occlusal and pulpal surfaces (perpendicular group) to reduce the cross-sectional area of the superficial, middle, and deep regions to 0.25 mm2, and subjected to microtensile testing. From SEM photomicrographs of the fractured specimens of the parallel group, the tubule density was investigated. For both parallel and perpendicular groups, superficial dentin showed a significantly higher UTS than deep dentin. The tubule density of superficial dentin was significantly lower than that of middle and deep dentin. When performing the microtensile bond test to deep dentin, it is possible that cohesive failure of dentin can occur at relatively low tensile stresses.

Original languageEnglish (US)
Pages (from-to)39-47
Number of pages9
JournalDental Materials Journal
Issue number1
StatePublished - Mar 2003


  • Dentin depth
  • Dentinal tubule direction
  • Ultimate tensile strength

ASJC Scopus subject areas

  • Ceramics and Composites
  • Dentistry(all)


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