Viscoelasticity of dental tissue conditioners during the sol-gel transition

H. Murata, H. Chimori, T. Hamada, J. F. McCabe

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Formation of tissue conditioners is a process of polymer chain entanglements. This study evaluated the influence of composition and structure on dynamic viscoelasticity of concentrated polymer solutions based on poly(ethyl methacrylate) (PEMA) used as tissue conditioners through the sol-gel transition. The hypothesis was that the ethanol content is the most influential factor in determining gelation speed. Rheological parameters were determined with the use of a controlled-stress rheometer. Analysis of variance by orthogonal array L16(45) indicated that the strong polar bonding of ethanol (contribution ratio p = 53.8%; confirming the hypothesis) and molecular weight of polymer powders (ρ = 26.7%) had a greater influence on the gelation times of PEMA-based systems than did the molar volume of plasticizers (ρ = 9.0%) and concentration of polymers (i.e., powder/liquid ratio) (ρ = 4.5%). The results suggest that the gelation of tissue conditioners based on PEMA can be controlled over a wide range by varying the polymer molecular weight, and especially ethanol content.

Original languageEnglish
Pages (from-to)376-381
Number of pages6
JournalJournal of dental research
Volume84
Issue number4
DOIs
Publication statusPublished - 2005 Apr

Keywords

  • Activation energy
  • Dynamic viscoelastic properties
  • Orthogonal array
  • Sol-gel transition
  • Tissue conditioners

ASJC Scopus subject areas

  • Dentistry(all)

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