Reduced polymerization stress through non-bonded nanofiller particles

John R. Condon, Jack L. Ferracane

Research output: Contribution to journalArticlepeer-review

46 Scopus citations


The stress that results from the placement of dental composite in a confined setting compromises the integrity of the marginal seal. Dental composites which include nanofiller particles that are not treated with a functional agent to couple them to the resin matrix can result in lower stress levels. Three types of nanofillers were evaluated having either a functional silane coating, a non-functional silane coating, or no coating. These were added at five different vol% levels to a photo-sensitized mixture of three dimethacrylate monomers alone or at three different vol% levels to the same resin filled with mini-filler particles to a clinically realistic level. The stress generated by these materials when cured in a confined setting was measured in a mechanical testing machine. The effect of monomer molecular weight on the stress levels was evaluated by preparing three resin formulations with varied co-monomer levels and filling them with bonded or non-bonded nanofillers. Reductions in polymerization stress of up to 31% were achieved among both the nanofilled resins and the mini-filled composite. The materials which contained a heightened level of diluent monomer produced significantly higher stress levels (ANOVA/Tukey's test, p<0.05). Significant reductions in polymerization stress can be achieved through minor alterations in composite chemistry.

Original languageEnglish (US)
Pages (from-to)3807-3815
Number of pages9
Issue number18
StatePublished - 2002


  • Composite
  • Dentistry
  • Nanofiller
  • Polymerization
  • Silanation
  • Stress

ASJC Scopus subject areas

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


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