Microhardness of bovine enamel after different ﬂuoride application protocols - Oliveira, Marcia Regina Cabral; Oliveira, Pedro Henrique Cabral; Oliveira, Luiz Henrique Cabral; Horliana, Anna Carolina Ratto Tempestini; Cesar, Paulo Francisco; Moura, Sandra Kiss; Bussadori, Sandra Kalil (Dental Materials Journal, 2019)