Bleaching of severely darkened nonvital tooth case report: 48 months clinical control - Machado, Alana Cristina; Braga, Sheila Regina Maia; Ferreira, Daniele; Scaramucci, Taís; Jacintho, Felipe Fernandes; Sobral, Maria Ângela Pita (Journal of Esthetic and Restorative Dentistry, 2020)