Effect of oxygen inhibition on composite repair strength over time

Susanna Dall'oca, Federica Papacchini, Cecilia Goracci, Álvaro H. Cury, Byoung I. Suh, Franklin R. Tay, Antonella Polimeni, Marco Ferrari

Research output: Contribution to journalArticlepeer-review

54 Scopus citations


The study was aimed at examining whether an oxygen inhibition layer is required for bonding a repairing to a pre-existing composite, and to determine the time required for free radicals within a composite substrate to decay to the extent that the composite repair strength drops significantly. Ten slabs of Gradia Direct Anterior (GC Corp.) were divided into (1) control group: an interfacial oxygen inhibition layer was created by applying and light-curing two layers of bonding resin (D/E Resin, Bisco) to the slabs surface in atmospheric air; (2) experimental group: the absence of an interfacial oxygen inhibition layer was obtained by light-curing the second bonding resin layer in a nitrogen atmosphere. After 1 and 2 h, 1, 14, and 30 days of air storage, a composite repair was layered over the bonding resin. Microtensile bond strengths were measured and statistically analyzed. The curing atmosphere was not a significant factor for bond strength (p = 0.82), and time and curing atmosphere-time interaction were significant (p < 0.001). The 30 day-strengths were the lowest (p < 0.05). An oxygen-inhibited layer is not initially required for bonding to resin composite, and it takes more than 14 days before the bond strength between a pre-existing and a fresh composite drops.

Original languageEnglish (US)
Pages (from-to)493-498
Number of pages6
JournalJournal of Biomedical Materials Research - Part B Applied Biomaterials
Issue number2
StatePublished - May 2007


  • Composite repair
  • Light-cured resin composite
  • Microtensile bond strength
  • Oxygen-inhibited layer
  • Time

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering


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