TI - Effect of ultra-sound on the surface hardness of glass-ionomer cements PY - 2005 AU - Machado, R. P. AU - Carvalho, C. A. R. AU - Lauris, José Roberto Pereira AU - Atta, Maria Teresa AU - Navarro, Maria Fidela de Lima T2 - General Session & Exhibition of the IADR - International Association for Dental Research J2 - Journal of Dental Research PP - Alexandria VL - 84 ER -