In this study, tensile bond strength of zinc phosphate, polycarhoxilate and glass ionomer cements were tested in vitro. For each cement 10 permanant lower 1. molar teeth were used and orthodontic bands were cemented on all teeth which embeded in acryic blocks The tensile strength was tested in Instron Machine and the tensile bond strength of three materials was found significantly different.

Keywords: Cementation, bond strength