Shortening of etching time of the dentin in primary teeth restorations: a randomized clinical trial - Cavalheiro, Cleber Paradzinski; Souza, Pablo Soares de; Rocha, Rachel de Oliveira; Raggio, Daniela Prócida; Lenzi, Tathiane Larissa; Pedrotti, Djessica; Casagrande, Luciano; Ardenghi, Thiago Machado (Brazilian Oral Research, 2020)