Effect of smear layer on root demineralization adjacent to resin-modified glass ionomer

A. S. Al-Helal, S. R. Armstrong, X. J. Xie, J. S. Wefel

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


The cariostatic effect of resin-modified glass ionomer (RMGI) on secondary root caries is well-documented. However, this beneficial effect may be dependent upon the mode of cavity surface treatment. To investigate this relationship, we studied 4 cavity surface treatments prior to the placement of RMGI: no treatment (None), polyacrylic acid (PAA), phosphoric acid (H3PO 4), and Scotchbond Multi-Purpose adhesive (SMP) as a control. Specimens were aged for two weeks in synthetic saliva, thermocycled, and subjected to an artificial caries challenge (pH 4.4). Polarized light microscopy (PLM) and microradiography (MRG) showed significantly less demineralization with the H3PO4 cavity surface treatment as revealed by ANOVA and Tukey's multiple comparisons (p ≤ 0.05). Dentin fluoride profiles determined by electron probe microanalysis (EPMA) supported PLM and MRG findings. It may be concluded that removal of the smear layer with phosphoric acid provides significantly enhanced resistance to secondary root caries formation adjacent to RMGI restorations.

Original languageEnglish (US)
Pages (from-to)146-150
Number of pages5
JournalJournal of Dental Research
Issue number2
StatePublished - Feb 2003


  • Demineralization
  • Fluoride
  • Glass ionomer
  • Root
  • Smear layer

ASJC Scopus subject areas

  • Dentistry(all)


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