Effect of a new liner/base on human dentin permeability

Richard P. Rusin, Kelli Agee, Michael Suchko, David H. Pashley

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Objectives: Resin-modified glass ionomers (RMGI) have demonstrated clinical success in their ability to minimize post-operative sensitivity of restorations. RMGIs have been recently introduced as paste-liquid systems for convenience of clinical usage. The objective of this study was to measure the ability of a new paste-liquid RMGI liner/base to reduce fluid flow through human dentin. Methods: Dentin permeability was measured on human crown sections on etched dentin, using etched dentin as a model for the exposed tubules typical of root sensitivity, and permitting measurement of the maximum permeability. In the one group, the etched dentin was coated with the RMGI, and pre- and post-treatment permeability was measured on the coated dentin. In the second group, a smear layer was created on the dentin with sandpaper, then the samples were coated with the RMGI; permeability was measured on the smeared and coated dentin. Samples from each group were sectioned and examined via scanning electron microscopy (SEM). Results: The new paste-liquid RMGI liner/base significantly reduced fluid flow through dentin, and exhibited excellent seal on dentin with either a smear layer or open tubules. SEM images show evidence that the RMGI infiltrated the smear layer with resin during placement, penetrated dentin tubules, and formed resin tags in acid-etched dentin. Conclusions: Based on these results, combined with previous research on adhesion and microleakage, it is concluded that the new RMGI liner/base should minimize post-operative sensitivity in restorations.

Original languageEnglish (US)
Pages (from-to)245-252
Number of pages8
JournalJournal of Dentistry
Issue number3
StatePublished - Mar 2010


  • Dentin permeability
  • Glass ionomer
  • Hybrid layer
  • Liner
  • Resin tag
  • SEM
  • Sensitivity
  • Smear layer

ASJC Scopus subject areas

  • Dentistry(all)


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