Abstract

NUNES, Paula Mendes Acatauassú; FERREIRA, Stella da Silva; SOBRAL, Maria Angela Pita  and  TURBINO, Míriam Lacalle. Smooth surface of nanoparticle composites after finishing and polishing protocols. Rev. Assoc. Paul. Cir. Dent. [online]. 2013, vol.67, n.4, pp. 300-305. ISSN 0004-5276.

The aim of this study was to evaluate the smoothness surface of 3 composites by nanoparticles (Filtek Z350 XT, Premise e Charisma Diamond), after being subjected to three different finishing and polishing systems. Were obtained 40 specimens of each resin selected and randomly divided into 4 experimental groups (n=10): C (control) - no treatment; SOF - Abrasive discs Soflex; ENH - silicon tips Enhance; and F / FF - diamond tips fine/extra-fine granulation + felt disc and diamond paste. Twenty-four hours after the preparation and storage of the specimens in distilled water at 37ºC, the finishing and polishing systems were applied. The smooth surface of the composites was evaluated using a rugosimeter, where five readings were taken on each specimen. The mean surface roughness (um) were analyzed by ANOVA, two factors, followed by Tukey's test, with significance of 1%. For all resins tested, statistical difference was found between finishing and polishing systems tested (p<0,01). To the resin Charisma roughness values were: C - 0,10a; SOF - 0,24b; ENH - 0,23b; F/FF - 0,32c. For the premise : C - 0,12a; SOF - 0,16ab; ENH - 0,22b; F/FF - 0,30c. For Filtek : C - 0,08a; SOF - 0,14ab; ENH - 0,20bc; F/FF - 0,26c. The control group obtained better results of surface smoothness for all composites tested. Regarding the treatments groups, SOF and ENH resulted on better smoothness surface, while the group F / FF resulted in surfaces with higher roughness.

Keywords : composite resins; nanotechnology; dental polishing.