Periradicular repair after single- and two-visit root canal treatments using ultrasonic irrigant activation and calcium hydroxide dressing of teeth with apical periodontitis: study protocol for randomized controlled trials. - Almeida, Gustavo M.; Carvalho, Vitor Hugo M.; Silva, Érika B. P.; Cançado, Marco Antonio F.; Barroso, Leonardo S.; Queiroz, Erica L.; An, Tien Li; Ribeiro, Ana Paula D.; Carvalho-Junior, Jacy R.; Leite, André F. (Trials, 2023)