Changes in resin-infiltrated dentin stiffness after water storage

S. Chiaraputt, S. Mai, B. P. Huffman, R. Kapur, K. A. Agee, C. K.Y. Yiu, D. C.N. Chan, C. Harnirattisai, D. D. Arola, F. A. Rueggeberg, D. H. Pashley, F. R. Tay

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


Plasticization of polymers by water sorption lowers their mechanical properties in a manner that is predictable by the polarity of their component resins. This study tested the hypothesis that when adhesive resins were used to create resin-infiltrated dentin, the reductions in their flexural moduli after water storage would be lowered proportional to their hydrophilic characteristics. Three increasingly hydrophilic resin blends were used to fabricate polymer beams and macro-hybrid layer models of resin-infiltrated dentin for testing with a miniature three-point flexure device, before and after 1-4 weeks of water storage. Flexural modulus reductions in macro-hybrid layers were related to, and more extensive than, reductions in the corresponding polymer beams. Macro-hybrid layers that were more hydrophilic exhibited higher percent reductions in flexural modulus, with the rate of reduction proportional to the Hoy's solubility parameters for total intermolecular attraction forces (δt) and polar forces (δp) of the macrohybrid layers.

Original languageEnglish (US)
Pages (from-to)655-660
Number of pages6
JournalJournal of Dental Research
Issue number7
StatePublished - Jul 2008


  • Flexural modulus
  • Hydrophilicity
  • Macro-hybrid layer
  • Solubility parameter
  • Water

ASJC Scopus subject areas

  • Dentistry(all)


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