Surface Roughness of Different Composite Resins After Application of 15% Carbamide Peroxide and Brushing with Toothpaste: An in-vitro study
Objectives: To evaluate the effect of brushing after application of 15% carbamide peroxide (CP) on the surface roughness of three types of composite resins.
Materials and Methods: Twenty samples measuring 4 mm in height and diameter were prepared from each of three composite resin types including microfilled; Heliomolar HB (MF), nanohybrid; IPS Empress Direct (NH) and microhybrid; Tetric Ceram HB (MH). After polishing, the initial surface roughness was measured with a profilometer. The tray technique was used to apply 15% CP gel for 6 hours. Then, the cleaning step was carried out with an electric toothbrush (Oral-B, Vitality Precision Model) for 3 minutes within a tank containing a freshly mixed toothpaste. These procedures were repeated for 21 days. Then the surface roughness was measured again and compared with the initial values. The mixed ANOVA model was used for the analysis of data (P<0.05).
Results: At baseline roughness was significantly lower in MF compared to the NH and MH (p<0.001). Roughness increased within all study groups over the intervention period; however, it was not statistically significant in the MH (p>0.05). Furthermore, there was a smaller increase of roughness in MF than in NH (p < 0.001) and MH (p = 0.02).
Conclusions: The effect of intervention was more pronounced in NH and MH groups. Surface roughness changes were minor in MF composite resin.
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