Evaluation of the surface roughness of the composite resin submitted to simulated brushing with different bleaching dentifrices

Abstract

OBJECTIVE: To evaluate the effect of tooth brushing with whitening toothpaste under the surface of the composite FiltekTM Z350 XT (3M ESPE, Dental Products, St. Paul, MN, USA). METHODS: Were made of 50 specimens were randomly divided into five groups (n = 10): G1 (Negative Control - No Brushing), G2 (Positive Control - Colgate Total 12), G3 (Colgate Luminous White), G4 (3D White Luxe - OralB) and G5 (Xtreme White - Sorriso). The specimens were subjected to 25,000 cycles, simulating a period of six months brushing considering three brushings a day for two minutes each. The parameter evaluated was the arithmetic average surface roughness (Ra) determined in rugosimeter SJ 301 (Mitutoyo, Japan), followed by photographic assessment by scanning electron microscopy (SEM), with an increase of 1000 times. RESULTS: Data were statistically analyzed for comparison between groups (ANOVA), 5% significance level. There was no statistical significance for the resin composite factor (p <0.001) and the interaction between factors (p> 0.05). The highest average roughness surface was obtained after 25,000 brushing cycles (5.7 mM), differing from the other groups. There was a greater surface smoothness of composite resin before brushing (G1). After brushing cycles, it observed that the G2 caused greater irregularity of the surface of the composite compared to other toothpastes groups. CONCLUSION: It can be concluded that the brushing greatly increases the surface roughness of the composite, regardless of toothpaste used.