Effects of polar solvents and adhesive resin on the denaturation temperatures of demineralised dentine matrices

Steven R. Armstrong, Julie L.P. Jessop, Erik Winn, Franklin R. Tay, David H. Pashley

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

Objectives: To measure the denaturation temperature (Td) of demineralised dentine matrix as a function of infiltration with water vs. polar solvents vs. adhesive resins. Methods: Small discs of normal dentine were completely demineralised in 0.5 M EDTA. Dried demineralised specimens were placed in water, methanol, ethanol, acetone, η-butanol or HEMA. Additional specimens were infiltrated with Prime&Bond NT and polymerised. All specimens sealed in high-pressure pans and scanned using differential scanning calorimetry (DSC). Results: Demineralised dentine saturated with water showed a Td of 65.6 °C that increased with saturation by methanol, ethanol, acetone, η-butanol or HEMA to 148.5 °C. These increases in Td were inversely related to the molar concentration of the solvents and to their Hoy's solubility parameter for hydrogen bonding (δh, p < 0.01), as well as directly related to the cube root of their molecular weights (p < 0.001). The presence of adhesive resins also increased the Td of demineralised matrices to even higher values depending if the resin bonded dentine was measured after 24 h of water storage (166.8 °C) or dry (172.7 °C) storage. Conclusions: Solvents and monomers with low δh values (i.e., 100% HEMA) increase the Td of demineralised dentine above that produced by solvents with higher δh values such as methanol and water.

Original languageEnglish (US)
Pages (from-to)8-14
Number of pages7
JournalJournal of Dentistry
Volume36
Issue number1
DOIs
StatePublished - Jan 1 2008

Keywords

  • Collagen
  • DSC
  • Dentine
  • Glass transition temperature
  • Resin
  • Solvents

ASJC Scopus subject areas

  • Dentistry(all)

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