Effects of resin hydrophilicity on water sorption and changes in modulus of elasticity

Shuichi Ito, Masanori Hashimoto, Bakul Wadgaonkar, Nadia Svizero, Ricardo M. Carvalho, Cynthia Yiu, Frederick Rueggeberg, Stephen Foulger, Takashi Saito, Yoshihiro Nishitani, Masahiro Yoshiyama, Franklin Chi Meng Tay, David Henry Pashley

Research output: Contribution to journalArticle

377 Citations (Scopus)

Abstract

As acidic monomers of self-etching adhesives are incorporated into dental adhesives at high concentrations, the adhesive becomes more hydrophilic. Water sorption by polymers causes plasticization and lowers mechanical properties. The purpose of this study was to compare the water sorption and modulus of elasticity (E) of five experimental neat resins (EX) of increasing hydrophilicity, as ranked by their Hoy's solubility parameters and five commercial resins. Methods: After measuring the initial modulus of all resin disks by biaxial flexure, half the specimens were stored in hexadecane and the rest were stored in water. Repeated measurements of stiffness were made for 3 days. Water sorption and solubility measurements were made in a parallel experiment. Results: None of the specimens stored in oil showed any significant decrease in modulus. All resins stored in water exhibited a time-dependent decrease in modulus that was proportional to their degree of water sorption. Water sorption of EX was proportional to Hoy's solubility parameter for polar forces (δp) with increasing polarity resulting in higher sorption. The least hydrophilic resin absorbed 0.55 wt% water and showed a 15% decrease in modulus after 3 days. The most hydrophilic experimental resin absorbed 12.8 wt% water and showed a 73% modulus decrease during the same period. The commercial resins absorbed between 5% and 12% water that was associated with a 19-42% reduction in modulus over 3 days.

Original languageEnglish (US)
Pages (from-to)6449-6459
Number of pages11
JournalBiomaterials
Volume26
Issue number33
DOIs
StatePublished - Nov 1 2005

Fingerprint

Elastic Modulus
Hydrophilicity
Hydrophobic and Hydrophilic Interactions
Sorption
Resins
Elastic moduli
Water
Solubility
Adhesives
Dental Cements
Etching
Polymers
Oils
Monomers
Stiffness
Mechanical properties

Keywords

  • Bis-phenol a derivative
  • Elasticity
  • Hydrophilicity
  • Hydroxyethyl methacrylate
  • Water

ASJC Scopus subject areas

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

Cite this

Ito, S., Hashimoto, M., Wadgaonkar, B., Svizero, N., Carvalho, R. M., Yiu, C., ... Pashley, D. H. (2005). Effects of resin hydrophilicity on water sorption and changes in modulus of elasticity. Biomaterials, 26(33), 6449-6459. https://doi.org/10.1016/j.biomaterials.2005.04.052

Effects of resin hydrophilicity on water sorption and changes in modulus of elasticity. / Ito, Shuichi; Hashimoto, Masanori; Wadgaonkar, Bakul; Svizero, Nadia; Carvalho, Ricardo M.; Yiu, Cynthia; Rueggeberg, Frederick; Foulger, Stephen; Saito, Takashi; Nishitani, Yoshihiro; Yoshiyama, Masahiro; Tay, Franklin Chi Meng; Pashley, David Henry.

In: Biomaterials, Vol. 26, No. 33, 01.11.2005, p. 6449-6459.

Research output: Contribution to journalArticle

Ito, S, Hashimoto, M, Wadgaonkar, B, Svizero, N, Carvalho, RM, Yiu, C, Rueggeberg, F, Foulger, S, Saito, T, Nishitani, Y, Yoshiyama, M, Tay, FCM & Pashley, DH 2005, 'Effects of resin hydrophilicity on water sorption and changes in modulus of elasticity', Biomaterials, vol. 26, no. 33, pp. 6449-6459. https://doi.org/10.1016/j.biomaterials.2005.04.052
Ito S, Hashimoto M, Wadgaonkar B, Svizero N, Carvalho RM, Yiu C et al. Effects of resin hydrophilicity on water sorption and changes in modulus of elasticity. Biomaterials. 2005 Nov 1;26(33):6449-6459. https://doi.org/10.1016/j.biomaterials.2005.04.052
Ito, Shuichi ; Hashimoto, Masanori ; Wadgaonkar, Bakul ; Svizero, Nadia ; Carvalho, Ricardo M. ; Yiu, Cynthia ; Rueggeberg, Frederick ; Foulger, Stephen ; Saito, Takashi ; Nishitani, Yoshihiro ; Yoshiyama, Masahiro ; Tay, Franklin Chi Meng ; Pashley, David Henry. / Effects of resin hydrophilicity on water sorption and changes in modulus of elasticity. In: Biomaterials. 2005 ; Vol. 26, No. 33. pp. 6449-6459.
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abstract = "As acidic monomers of self-etching adhesives are incorporated into dental adhesives at high concentrations, the adhesive becomes more hydrophilic. Water sorption by polymers causes plasticization and lowers mechanical properties. The purpose of this study was to compare the water sorption and modulus of elasticity (E) of five experimental neat resins (EX) of increasing hydrophilicity, as ranked by their Hoy's solubility parameters and five commercial resins. Methods: After measuring the initial modulus of all resin disks by biaxial flexure, half the specimens were stored in hexadecane and the rest were stored in water. Repeated measurements of stiffness were made for 3 days. Water sorption and solubility measurements were made in a parallel experiment. Results: None of the specimens stored in oil showed any significant decrease in modulus. All resins stored in water exhibited a time-dependent decrease in modulus that was proportional to their degree of water sorption. Water sorption of EX was proportional to Hoy's solubility parameter for polar forces (δp) with increasing polarity resulting in higher sorption. The least hydrophilic resin absorbed 0.55 wt{\%} water and showed a 15{\%} decrease in modulus after 3 days. The most hydrophilic experimental resin absorbed 12.8 wt{\%} water and showed a 73{\%} modulus decrease during the same period. The commercial resins absorbed between 5{\%} and 12{\%} water that was associated with a 19-42{\%} reduction in modulus over 3 days.",
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AU - Carvalho, Ricardo M.

AU - Yiu, Cynthia

AU - Rueggeberg, Frederick

AU - Foulger, Stephen

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