Effectiveness of surface protection of resin modified glass ionomer cements evaluated spectrophotometrically - Cefaly, Daniela Francisca Gigo; Seabra, Bárbara Gomes de Melo; Tapety, Celiane Mary Carneiro; Taga, Eulázio Mikio; Valera, Fabiano; Navarro, Maria Fidela de Lima (Operative Dentistry, 2001)