Tonholo J, Penteado RA, JĂșnior JG, de Andrade Silva MF, da Silva Queiroz C, Cavalli V, Rego MA, Liporoni PC. Evaluation of Surface Roughness of Microhybrid and Nanofilled Composites after pH-Cycling and Simulated Toothbrushing. J Contemp Dent Pract 2010; 11 (6):17-24.