In vitro analysis of surface roughness of acrylic resin exposed to the combined hygiene method of brushing and immersion in Ricinus communis and sodium hypochlorite - Badaró, Maurício Malheiros; Salles, Marcela Moreira; Arruda, Carolina Noronha Ferraz de; Oliveira, Viviane de Cássia; Souza, Raphael Freitas de; Paranhos, Helena de Freitas Oliveira; Silva-Lovato, Cláudia Helena (Journal of Prosthodontics, 2017)