Objective: The aim of this in vitro study was evaluate the effects of repeated casting of base metal alloy on metal ceramic bond strength. Methods: thirty metal-ceramic samples were constructed for testing in present study. The produced samples will be divided according to the type of the investigated alloy into two equal main groups: Group I: Fifteen samples were constructed from Ni-Cr (Wiron 99) alloy and veneered with porcelain (VITA VMK Master). Group II: Fifteen samples were constructed from Co-Cr (Wirobond SG) alloy and veneered with porcelain (VITA VMK Master). Each group were further subdivided into three equal subgroups of five samples each according to the number of repeated casting of the alloys. Results: Nickel Chromium group recorded statistically significant (p< 0.05) higher shear bond strength mean value (46.21 ± 7.4 Mpa) than Cobalt Chromium group (41.15 ± 3.7 MPa). For both tested alloys it was found that first cast group recorded statistically significant (p< 0.05) highest shear bond strength mean value (50.89 ± 5.6 Mpa) followed by first recast group (41.44 ± 1.1 MPa) while second recast group recorded statistically significant (p< 0.05) lowest mean value (38.71 ± 1.99 MPa). SEM showing a mixed mode of failure. Adhesive failure at the metal/porcelain interface and cohesive failure within the porcelain in all subgroups.Conclusion: The nickel chromium alloy groups showed higher shear bond strength value than cobalt chromium alloy groups. For both tested alloys, the first cast alloy group showed higher shear bond strength values followed by first recast alloy group whereas the second recast alloy group showed lowest values. A significant decrease in the metal ceramic bond of base metal alloy after the addition of recast alloy.