The bond strengths of porcelain bonded to porcelain specimens using tw
o different filled resin-based cements were compared by means of notch
ed-disc test specimens. As a control group, unrepaired porcelain test
specimens were fractured. Additionally, one group of broken half-repai
rs was achieved by applying a bonding agent only. The control test spe
cimens had significantly higher fracture strengths (P < 0.05) than the
specimens bonded with either bonding agent or resin-based cements. No
difference between the resin-based cements was found (P > 0.05).