Effect of different polishing time on the color stability of provisional materials: An In vitro study
Journal of Advanced Clinical and Research Insights
Provisional fixed restoration is an essential component in prosthodontics treatment. These materials may experience color change for surface roughness. To reduce it, a polishing technique is required with a time setting specified. Aims and Objectives: The aim of this study was to evaluate the effect of different polishing time on the color stability of provisional materials. Materials and Methods: One hundred and forty-four resin blocks were prepared, divided into Group A, PMMA acrylic resin
... MA acrylic resin and Group B, bis-acryl resin. They were polished with goat hairbrush and diamond paste. Twenty-four hours stored in distilled water and 12 th day on the staining solution coffee and wine. They were measured with a spectrophotometer, analyzed, and processed with the CieLab system, to calculate color difference ∆E. Results: On the 3 rd day of the immersion period, the lowest mean value was showed with 1 min polishing on Group A, showing to be statistically significant, P = 0.011. In Group B, the lowest mean value was showed with 1 min 30 s. At the 7 th and 12 th days immersion period, the lowest mean value was showed with 30 s polishing among the groups. Conclusions: Polishing 30 s showed the lowest ∆E values on PMMA and bis-acryl resin. Mean color differences were above the clinical acceptability threshold ∆E > 3.3. Regarding the staining agent, the highest ΔE values were observed in coffee.