Impact of a novel polishing method on the surface roughness and micromorphology of nanofilled and microhybrid composite resins

Polyana Moura Ferreira, Silvia Helena Azevedo Souto, Boniek Castillo Dutra Borges, Isauremi Vieira de Assunção, Giovanna de Fátima Alves da Costa
2015 Revista Portuguesa de Estomatologia, Medicina Dentaria e Cirurgia Maxilofacial  
r e v p o r t e s t o m a t o l m e d d e n t c i r m a x i l o f a c . 2 0 1 5;5 6(1):18-24 a b s t r a c t Objective: This study aimed to evaluate the effects of different finishing and polishing techniques, including a novel polishing method (silicon carbide brush), on the surface roughness and morphology of nanofilled (Filtek Z350XT) and microhybrid (Filtek Z250) composite resins. Methods: Thirty-five specimens of each resin were fabricated and assigned randomly to receive the following
more » ... shing/polishing treatments (n = 5 per group): none (control), Sof-Lex Pop-On discs (POP), Praxis discs (PRA), POP + felt discs with diamond paste, POP + silicon carbide brush, PRA + felt discs with diamond paste, and PRA + silicon carbide brush. Average roughness (Ra) in m was evaluated using a 3D profilometer. Scanning electron microscopic images were also obtained and descriptively analyzed. Two-way analysis of variance and Tukey's test (p < 0.05) were used to evaluate the effects of resin type, finishing/polishing system, and interactions between these two variables on Ra values. Results: For the microhybrid resin, greater surface smoothness was obtained using POP or PRA + silicon carbide brush. For the nanofilled resin, the smoothest surface was obtained with POP + felt discs with diamond paste or silicon carbide brush. Conclusion: The surface roughness of a composite resin depends on its composition and finishing and polishing technique used.
doi:10.1016/j.rpemd.2015.01.002 fatcat:zer2kmdhdjb33lo53wcb73wfwq