Light-Curing Effects on the Polishability, Gloss Retention and Repolishability of Composite Resins

Esthetic restorative treatments strongly rely on the material's optical properties for accurate tooth mimicking. Besides the color of resin composites it has been reported that surface gloss strongly affect the final result of esthetic restorations. The opticalproperties of composite resins depend on proper monomer conversion throughadequate light curing procedures. Little is reported in the literature about how the qualityof the light curing procedures can affect these properties.
The aim of this study is to compare the quality of light curing delivery effects onthe polishability, gloss retention and repolishability of resin-based composite resins. 72 specimens (10 mm diameter and 2.5mm thick; N=6) will be fabricated utilizing 2 lightcuringmodalities ("ideal" / "intentionally faulty") and 6 different materials: EsteliteOmega; G-aenial Sculpt; Harmonize, Omnichroma, Renamel Microfill and Mosaic. Afterpolishing, baseline gloss measurements will be taken for each sample using a Glossmeter (Novo-gloss). Specimens will be submitted to toothbrushing abrasion test and gloss will be measured again at different intervals (1, 2 and 3hs). Specimens will be repolished and a final gloss measurement completed. Data will be analyzed using threeway analysis of variance and Tukey test.

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