Effects of ethanol addition on the water sorption/solubility and percent conversion of comonomers in model dental adhesives

Juliana Malacarne-Zanon, David H. Pashley, Kelli A. Agee, Stephen Foulger, Marcelo Corrêa Alves, Lorenzo Breschi, Milena Cadenaro, Fernanda P. Garcia, Marcela R. Carrilho

Research output: Contribution to journalArticle

53 Scopus citations

Abstract

Objectives: This study evaluated the kinetics of water uptake and percent conversion in neat versus ethanol-solvated resins that were formulated to be used as dental bonding agents. Methods: Five methacrylate-based resins of known and increasing hydrophilicities (R1, R2, R3, R4 and R5) were used as reference materials. Resins were evaluated as neat bonding agents (100% resin) or they were solvated with absolute ethanol (95% resin/5% ethanol or 85% resin/15% ethanol). Specimens were prepared by dispensing the uncured resin into a circular mold (5.8 mm × 0.8 mm). Photo-activation was performed for 80 s. The water sorption/diffusion/solubility was gravimetrically evaluated, while the degree of conversion (DC) was calculated by Fourier-transform infrared spectroscopy. Results: Water sorption increased with the hydrophilicity of the resin blends. In general, the solvated resins exhibited significantly higher water sorption, solubility and water diffusion coefficients when compared to their corresponding neat versions (p < 0.05). The only exception was resin R1, the least hydrophilic resin, in which neat and solvated versions exhibited similar water sorption (p > 0.05). Addition of ethanol increased the DC of all resins tested, especially of the least hydrophilic, R1 and R2 (p < 0.05). Despite the increased DC of ethanol-solvated methacrylate-based resins, it occurs at the expense of an increase in their water sorption/diffusion and solubility values. Significance: Negative effects of residual ethanol on water sorption/solubility appeared to be greater as the hydrophilicity of the resin blends increased. That is, the use of less hydrophilic resins in dental adhesives may create more reliable and durable bonds to dentin.

Original languageEnglish (US)
Pages (from-to)1275-1284
Number of pages10
JournalDental Materials
Volume25
Issue number10
DOIs
StatePublished - Oct 1 2009

Keywords

  • Dental adhesives
  • Percent conversion
  • Residual ethanol
  • Water sorption/solubility

ASJC Scopus subject areas

  • Materials Science(all)
  • Dentistry(all)
  • Mechanics of Materials

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    Malacarne-Zanon, J., Pashley, D. H., Agee, K. A., Foulger, S., Alves, M. C., Breschi, L., Cadenaro, M., Garcia, F. P., & Carrilho, M. R. (2009). Effects of ethanol addition on the water sorption/solubility and percent conversion of comonomers in model dental adhesives. Dental Materials, 25(10), 1275-1284. https://doi.org/10.1016/j.dental.2009.03.015