Aging affects two modes of nanoleakage expression in bonded dentin

F. R. Tay, M. Hashimoto, D. H. Pashley, M. C. Peters, S. C.N. Lai, C. K.Y. Yiu, C. Cheong

Research output: Contribution to journalArticle

156 Scopus citations

Abstract

Water sorption into resin-dentin interfaces precedes hydrolytic degradation. We hypothesized that these processes are morphologically manifested by the uptake of ammoniacal silver nitrate, which is thought to trace hydrophilic domains and water-filled channels within matrices. Water sorption is thought to be nonuniform and can be traced by the use of silver nitrate. Human teeth bonded with an experimental filled-adhesive were aged in artificial saliva (experimental) or non-aqueous mineral oil (control). Specimens retrieved for up to a 12-month period were immersed in 50 wt% ammoniacal silver nitrate and examined by transmission electron microscopy for identification of the changes in their silver uptake. Reticular silver deposits initially identified within the bulk of hybrid layers in the experimental group were gradually reduced over time, but were subsequently replaced by similar deposits that were located along the hybrid layer-adhesive interface. Silver uptake in water-binding domains of the adhesive layers increased with aging, resulting in water tree formation. These water-filled channels may act as potential sites for hydrolytic degradation of resin-dentin bonds.

Original languageEnglish (US)
Pages (from-to)537-541
Number of pages5
JournalJournal of Dental Research
Volume82
Issue number7
DOIs
StatePublished - Jul 2003

Keywords

  • Hydrolytic degradation
  • Nanoleakage
  • Water sorption
  • Water trees

ASJC Scopus subject areas

  • Dentistry(all)

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    Tay, F. R., Hashimoto, M., Pashley, D. H., Peters, M. C., Lai, S. C. N., Yiu, C. K. Y., & Cheong, C. (2003). Aging affects two modes of nanoleakage expression in bonded dentin. Journal of Dental Research, 82(7), 537-541. https://doi.org/10.1177/154405910308200710