Effect of a titanium tetrafluoride varnish in the prevention and treatment of carious lesions in the permanent teeth of children living in a fluoridated region: protocol for a randomized controlled trial - Souza, Beatriz Martines de; Santos, Daiana Moreli Soares dos; Braga, Aline Silva; Santos, Natália Mello dos; Rios, Daniela; Buzalaf, Marília Afonso Rabelo; Magalhães, Ana Carolina (JMIR Research Protocols, 2018)