Cytotoxicity evaluation of a copaiba oil-based root canal sealer compared to three commonly used sealers in endodontics - Garrido, Angela Delfina Bittencourt; Cara, Sueli Patricia Harumi Miyagi de; Marques, Marcia Martins; Sponchiado Júnior, Emílio Carlos; Garcia, Lucas da Fonseca Roberti; Sousa Neto, Manoel Damião de (Dental Research Journal, 2015)