Compliant phase reduces polymerization shrinkage in dental composite resin

Valerie A. Lee, H. Ralph Rawls

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Commercially available dental composite resins undergo polymerization shrinkage during curing, setting up internal stress that can result in debonding at the tooth-composite interface, tooth fracture and composite failure. Debonding can also lead to marginal leakage and recurrent decay. The presence of a compliant phase, in this case polybutadiene in aggregate form with fumed silica, is shown to reduce polymerization shrinkage in the bis-GMA/TEGDMA resin system. The addition of a small amount of the plasticizer triphenylethylene promoted additional reduction in cure shrinkage by reducing the glass transition temperature, T g. A trend toward reduced cure shrinkage was noted as the polybutadiene : silica ratio decreased within each molecular weight of polybutadiene tested. The optimal formulation tested was determined to be 0.25 wt. % triphenylethylene in bis-GMA with aggregates formed from polybutadiene of molecular weight 2-3 million, in a polybutadiene : silica ratio of 0.005. Shrinkage reduction in this system was ∼ 42% without loss of Knoop hardness.

Original languageEnglish (US)
Pages (from-to)2306-2310
Number of pages5
JournalJournal of Applied Polymer Science
Issue number6
StatePublished - Sep 15 2005


  • Composite resins
  • Plasticizer
  • Polybutadiene
  • Polymer
  • Polymerization shrinkage

ASJC Scopus subject areas

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry


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