Abstract
The current study investigated the effects of different polishing systems on the surface roughness and microhardness of a silorane-based resin composite. Forty disks were fabricated (ø = 12 mm, h = 2.5 mm) of Filtek P90 (3 M ESPE, USA). The specimens were divided into four groups (n = 10), according to the polishing system: G1 - Mylar strip (control); G2 - Felt-disc + diamond paste, G3 - Sandpaper discs; G4 - Silicone tips. The specimens were stored in distilled water at 37°C for 24 h. The external surface roughness was determined through measuring the Ra of the specimens. The Vickers microhardness was measured using a microhardness tester. The values of surface roughness and microhardness of each specimen were statistically analyzed using one-way ANOVA, Games-Howell and Ryan-Einot-Gabriel-Welsch (REGW-Q), and setting the statistical significance at p ≤ 0.05. It was observed that G2 (0.42 μm) and G4 (0.43 μm) showed statistically significant differences when compared to groups G1 (0.25 μm) and G3 (0.19 μm) (p <0.05). There was no statistical difference between groups regarding microhardness (p > 0.05). The polishing systems altered the surface roughness of a silorane-based resin composite, but did not influence the microhardness values.
Highlights
A silorane-based resin matrix presents less curing shrinkage when compared to a methacrylate resin matrix
With the results of this article, the authors related that the polishing systems altered the surface roughness of a silorane-based resin composite, but did not influence its microhardness
The roughness values (Ra) values were statistically similar between groups G2 and G4, and both were significantly when compared to G1 and G3 (p < 0.05)
Summary
A silorane-based resin matrix presents less curing shrinkage when compared to a methacrylate resin matrix. The siloxane gives the material the property of hydrophobicity, while oxiranes are rings which act chemically during formation of polimers through a cationic ring-opening mechanism. This process results in polymerization shrinkage of less than 1% [1]. The microhardness and surface roughness are properties of a composite that are related to the material’s resistance to masticatory forces, its appearance such brightness and surface texture and the longevity of the restoration. With the results of this article, the authors related that the polishing systems altered the surface roughness of a silorane-based resin composite, but did not influence its microhardness
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