Abstract
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 language | English (US) |
|---|---|
| Pages (from-to) | 493-498 |
| Number of pages | 6 |
| Journal | Journal of Biomedical Materials Research - Part B Applied Biomaterials |
| Volume | 81 |
| Issue number | 2 |
| DOIs | |
| State | Published - May 2007 |
Keywords
- Composite repair
- Light-cured resin composite
- Microtensile bond strength
- Oxygen-inhibited layer
- Time
ASJC Scopus subject areas
- Biomaterials
- Biomedical Engineering