To analyze marginal integrity of resin composites dental restorations using optical coherence tomography (OCT).
extracted human premolars had occlusal cavities prepared and were
randomly divided according to the restorative systems evaluated: Filtek
P90™/P90 Adhesive System™, Filtek Z350™, and Filtek Z250™/Single Bond™
(3M/ESPE). The teeth were then stored in the dark for 24h in 0.9% saline solution. Restorations were finished and polished and stored again for 24h before thermocycling (500 cycles, 5–55°C). A commercially available OCT system was used (SR-OCT: OCP930SR/Thorlabs) with 930nm central wavelength. Cross-sectional images were obtained every 250μm and evaluated using Image J. A-scans were analyzed using the Origin 8.0 program, after a filter treatment using Matlab.
qualitative analysis of the internal margins did not observe gaps even
after A-scan examination, although distinctive patterns were found for
each restorative system. Penetration of Single Bond and Filtek P90
self-etch primer into dentin was also observed. A thick adhesive layer
was found for Filtek P90 bonding agent.
the characteristics of the OCT system, the setup used in this study was
capable of evaluating the marginal integrity of resin composite
restorations and detecting some interaction between dental bonding
agents and dental substrates. OCT can be considered a promising method
for the evaluation of the internal margins of restorations in vivo.