Effect of resin hydrophilicity and water storage on resin strength

C. K.Y. Yiu, N. M. King, D. H. Pashley, B. I. Suh, R. M. Carvalho, M. R.O. Carrilho, F. R. Tay

Research output: Contribution to journalArticlepeer-review

261 Scopus citations


This study evaluated the change in the ultimate tensile strength (UTS) of five polymerised resin blends of increasing hydrophilicity, after ageing in distilled water or silicon oil. Resin blocks were prepared from each resin blend by dispensing the uncured resin into a flexible, embedding mould, containing multiple cavities. The resins were polymerised in the moulds under nitrogen at 551.6kPa and light-activated at 125°C for 10min. After dry ageing for 24h at 37°C, the middle third of each resin specimen was trimmed into an 'I' shape. Fifteen control specimens were randomly selected from each resin blend for baseline UTS evaluation. The UTS of the experimental specimens were determined after 1, 3, 6 and 12 months of ageing in water or oil. The UTS of each group of resins at different storage periods in water or oil were analysed using the Friedman multiple ANOVA on ranks and Dunn's multiple comparison tests at 95% confidence level. Significant reduction (p<0.01) in UTS was observed in Groups II-V resins after 12-month storage in water, while the most hydrophobic Group I resin showed no significant change (p>0.05) in the same period. The percentage reduction in UTS increased with the hydrophilicity of the resin blends. Long-term water storage of hydrophilic resin blends such as those employed in dentine adhesives, resulted in a marked reduction in their mechanical strength that may compromise the durability of resin-dentine bonds.

Original languageEnglish (US)
Pages (from-to)5789-5796
Number of pages8
Issue number26
StatePublished - Nov 2004
Externally publishedYes


  • Hydrophilicity
  • Resin
  • Solubility parameter
  • Ultimate tensile strength

ASJC Scopus subject areas

  • Bioengineering
  • Ceramics and Composites
  • Biophysics
  • Biomaterials
  • Mechanics of Materials


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