Effect of microfiller fraction and silane treatment on resin composite properties

M. W. Beatty, M. L. Swartz, B. K. Moore, R. W. Phillips, T. A. Roberts

Research output: Contribution to journalArticlepeer-review

49 Scopus citations


A series of microfilled resin composites were formulated by incrementally mixing either agglomerated 20 nm or unagglomerated 50 nm silica microfillers into monomers composed of diphenyloxymethacrylate and TEGDMA. The microfiller particles were prepared with and without a γ- methacryloxypropyl-trimethoxy silane coupling agent. Following polymerization, five material properties were tested: uniaxial tensile strength, Young's modulus in slow compression, Knoop hardness, water sorption, and toothbrush abrasion resistance. Results from these tests indicated that microfiller content clearly was the most influential parameter affecting material property performance. Composites containing 20 nm particles demonstrated greater water sorption, higher Knoop hardness, and better resistance to toothbrush wear. Surprisingly, the application of silane to microfiller surfaces did not greatly improve composite performance for most of the material properties tested in this study. However, water sorption behavior over a 3-year period was observed to be more stable for materials possessing silane-treated particles. Future evaluation of coupling agents should include long-term water storage prior to conducting mechanical tests.

Original languageEnglish (US)
Pages (from-to)12-23
Number of pages12
JournalJournal of Biomedical Materials Research
Issue number1
StatePublished - Apr 1998


  • Mechanical properties
  • Resin composite
  • Silane treatment
  • Water sorption

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering


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