Resumo

MUNDIM, Fabrício Mariano; CRUVINEL, Diogo Rodrigues; GARCIA, Lucas da Fonseca Roberti  e  PIRES-DE-SOUZA, Fernanda de Carvalho Panzeri. Effect of fluoride solutions on color and surface roughness of dental composites. RFO UPF [online]. 2014, vol.19, n.1, pp. 77-82. ISSN 1413-4012.

Objective: The aim of this study was to assess the action of fluoride solutions on color stability (ΔE) and surface roughness (Ra) of composites (HeliomolarTM, 4 SeasonsTM, Tetric N-CeramTM, SR AdoroTM). Materials and method: A Teflon matrix (12x2 mm) was used to fabricate 24 test specimens for each composite. The samples were separated into 4 groups (n=6), according to the immersion solution: distilled water (control), acidulated phosphate fluoride (1.23%), neutral sodium fluoride gel (2%), and solution of sodium fluoride (0.05%). Color (Spectrophotometer PCB 6807) and roughness (Surfcorder SE 1700) readings were performed before and after immersion into the solutions. Results: Composites presented color alteration within clinically acceptable limits (ΔE<3.3), increasing according to the periods of immersion. Regarding roughness, it was observed that Ra values were lower than the critical limit to promote increase in dental biofilm retention (Ra>0.2 μm). Conclusions: Color and surface roughness alteration of the different composites was clinically acceptable after immersion in all fluoride solutions and in all periods.

Palavras-chave : Composite resins.; Color.; Surface properties.; Acidulated phosphate fluoride..