Abstract
Direct restorations in composite resin require superficial rugosity appropriate to guarantee a surface free of biofilm buildup, which interferes with the durability of the restoration, its properties and the aesthetic aspect. Thus, it is relevant to know the behaviour of the finishing and polishing systems. The in vitro study aimed to compare the polishing efficiency of three different polishing systems in promoting the surface smoothness of a nanocomposite resin. Sixty specimens of the nanocomposite resin Filtek Z350 XT (3M) were made, randomly divided into three groups (n=20), according to the tested polishing systems: Enhance (Dentsply), DFL Polishers, and Sof-Lex Spiral (3M). The surface rugosity of the samples was measured by means of the rugosimeter equipment. The data were analysed through statistical tests: ANOVA two-way and post-hoc Tukey. The results indicated Sof-Lex (3M) polishing discs as the ones with the lowest average surface rugosity (0.13µm), presenting statistically significant results (p<0.05); followed by the abrasive rubbers of the DFL system (0.17 µm) and the Enhance system (Dentsply), which showed greater average surface rugosity (0.30 µm). The lowest surface rugosity of the composite resin evaluated in this study (Z350 XT- 3M) was obtained after polishing with the multi-step system (Sof-Lex), from the same manufacturer.
Highlights
Composite resin is a material that constantly evolves in terms of physical, mechanical and aesthetic properties, and is widely indicated for aesthetic and functional restorations
The lowest surface rugosity of the composite resin evaluated in this study (Z350 XT3M) was obtained after polishing with the multi-step system (Sof-Lex), from the same manufacturer
The objective of this in vitro study was to verify the performance of three different polishing systems over the surface rugosity of a nanoparticulated composite resin, considering that multi-step systems are often associated with better polishing results
Summary
Composite resin is a material that constantly evolves in terms of physical, mechanical and aesthetic properties, and is widely indicated for aesthetic and functional restorations. In view of the clinical relevance of the final polishing stage, knowledge about the behaviour of the existing finishing and polishing systems is understood as primordial, in order to guarantee the achievement of an adequate surface smoothness to the restorative material, aiming at patient comfort, aesthetics and clinical longevity of the restoration performed. The objective of this in vitro study was to verify the performance of three different polishing systems (multiple-step and one step) over the surface rugosity of a nanoparticulated composite resin, considering that multi-step systems (decreasing granulation) are often associated with better polishing results
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