Susceptibility of restorations and adjacent enamel/dentine to erosion under different salivary flow conditions

Maryam A. Alghilan, N. Blaine Cook, Jeffrey A. Platt, George J. Eckert, Anderson T. Hara

Research output: Contribution to journalArticle

5 Scopus citations


Objectives The aim of this study was to investigate the effect of erosion on direct tooth-coloured restorations and adjacent enamel/dentine under low and normal simulated salivary flow rates. Methods Bovine enamel and dentine specimens were prepared (n = 16) and restored with the following materials: resin composite (FiltekZ250), resin-modified glass ionomer cement (Fuji II LC), high-viscosity glass ionomer cement (Fuji IX), and conventional glass ionomer cement (Fuji II). They were submitted to in vitro erosion-remineralisation cycling simulating normal (0.5 ml/min) and low (0.05 ml/min) salivary flow rates, for 5 days. The restorative material, enamel and dentine substrates were assessed with optical profilometry for surface loss. Mixed-model ANOVAs were used for statistical comparisons (alpha = 0.05). Results Low-salivary flow significantly increased surface loss for all tested substrates (p < 0.05), except FiltekZ250. Surface loss (mean ± SD, in micrometres) under low-salivary flow was significantly higher in enamel (19.75 ± 4.27) and dentine (23.08 ± 3.48) adjacent to FiltekZ250 compared to Fuji II LC (16.33 ± 2.30 and 20.47 ± 2.58, respectively) and Fuji IX (15.79 ± 2.41 and 20.63 ± 2.34, respectively). Restoration surface degradation was significantly lower for Fuji II LC (2.17 ± 0.73) than for both Fuji II (13.03 ± 6.79), and Fuji IX (16.74 ± 7.72) under low-salivary flow condition; whereas FiltekZ250 exhibited no meaningful surface loss (-0.35 ± 0.19). Conclusion Limited to these in vitro conditions, low-salivary flow promoted higher erosive conditions for teeth and restorations. Some fluoride-containing restorative materials may reduce erosive wear on adjacent enamel and dentine. FiltekZ250 resisted erosive surface loss. Fuji II LC showed both reduced acid degradation and protection of adjacent dental surfaces to erosion. Clinical significance Patients at risk for erosion and in need of restorations may benefit from fluoride-containing restorative materials that resist erosive degradation. The data of this study suggest that resin-modified glass ionomer may be a suitable restoration for patients at higher risk of erosion with low exposure to fluoride.

Original languageEnglish (US)
Pages (from-to)1476-1482
Number of pages7
JournalJournal of Dentistry
Issue number12
StatePublished - Dec 1 2015


  • Composite resin
  • Glass ionomer cements
  • Hyposalivation
  • Teeth erosion
  • Xerostomia

ASJC Scopus subject areas

  • Dentistry(all)

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