Hardness and elasticity of sound and caries-affected primary dentin bonded with one-step self-etch adhesive

Yumiko Hosoya, Franklin Chi Meng Tay, Masashi Miyazaki, Takashi Inoue

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Biomechanical properties of bonded dentin are important for resin restorations. We hypothesized that there are no differences in the hardness and elasticity of sound and caries-affected primary dentin bonded with a one-step self-etch adhesive. Resin-dentin interfaces in sound and caries-affected primary dentin were measured with a nano-indentation tester and observed with SEM and TEM. Interfacial dentin hardness was similar for sound and caries-affected dentin, but significantly lower than the underlying intact dentin. As for the Young's modulus of interfacial dentin, both substrates exhibited significantly lower values than the subsurface dentin. Further, the Young's modulus of interfacial dentin was significantly lower in caries-affected dentin. TEM revealed extensive interfacial nanoleakage in bonded sound dentin, while it was minimal in bonded caries-affected dentin. However, in the latter, silver deposits were identified within the porous substrate. Shorter application time and/or improvement of the adhesive components may be required to obtain stable adhesion in primary dentin.

Original languageEnglish (US)
Pages (from-to)493-500
Number of pages8
JournalDental Materials Journal
Volume26
Issue number4
DOIs
StatePublished - Jul 2007

Keywords

  • Caries-affected dentin
  • Hardness
  • Nanoleakage
  • Sound dentin
  • Young's modulus

ASJC Scopus subject areas

  • Ceramics and Composites
  • Dentistry(all)

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