Abstract
Objective: the aim of this study was to assess the effects of whitening dentifrices on the surface roughness of three commercial nanofiller-based composite. Material and Methods: two optical analyses were performed: stereomicroscopy and atomic force microscopy (AFM). Disks (8.0 diam. x 2.0 mm thick.) of the nanocomposite Z350 (3M ESPE) and two nano-hybrid composites (EsthetXHD, Dentsply and Premisa, Kerr) were submitted to in vitro brushing (1000 cycles) with three whitening dentifrices (Colgate Luminous White, Oral-B 3D White e Close-Up Diamond Attraction) and a control (Colgate Total12). The results were analyzed by stereomicroscopy and rated according to the following criteria: 0 – no observed roughness, 1 – average roughness, 2 – great roughness. Data was submitted to Kruskall-Wallis non-parametric test followed by Tukey test (p = 0.05). Z350 specimens were assessed by AFM. Results: the surface roughness of composites brushed with whitening dentifrices was statistically higher than the roughness found in specimens brushed with conventional dentifrice. AFM analyses showed that, at a submicrometric scale, there was an increase in the number of peaks and irregularities in specimens brushed with whitening dentifrices. Conclusion: Whitening dentifrices may have an impact on the longevity of dental composites by an increase in its roughness. It is strongly recommended that clinicians guide their patients, warning them about the risks and consequences of their use. KeywordsAbrasion; Dentifrices; Composites resin; Roughness; Whitening; Abrasive.
Highlights
Dental composites have continuously evolved since its inception, many decades ago
Specimens brushed with whitening dentifrices showed higher roughness than control, as shown in figure 1
Noteworthy it is the fact that atomic force microscopy (AFM) images corroborate with the results found in stereomicroscopy analysis
Summary
Dental composites have continuously evolved since its inception, many decades ago. The main change experienced by this material during its development was related to the type and size of its fillers particles. From the 2000s, the composites began to be produced with the aid of nanotechnology [2,3] and, inorganic particles of silica and zirconia, with an average size of about 0.005-0.07μm, came into use These composites have been presenting great optical characteristics mainly due to the ease of wear, which results in better polishing. Noteworthy it is the fact that investments in oral health widely spread the use of dentifrices as a method to prevent tooth decay, periodontal diseases, halitosis and many problems related to the oral cavity. For this purpose, organic solvents and abrasives are added to toothpastes. The harshness of toothpastes should not be so high as to cause damage, even unintentionally, to hard or soft tissue of the oral cavity, or even to dental restorations. [8]
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