Do different bleaching protocols affect the enamel microhardness? - Mondelli, Rafael Francisco Lia; Gabriel, Taisa R. Conti Garrido; Rizzante, Fabio Antonio Piola; Magalhães, Ana Carolina; Bombonatti, Juliana Fraga Soares; Ishikiriama, Sérgio Kiyoshi (European Journal of Dentistry, 2015)