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Shear and tensile bond strengths of two resin cements to a high gold alloy: an in vitro study.

The shear and tensile bond strengths of two resin cements to a high gold alloy with differently prepared surfaces were compared. Eighty buttons were cast from Argident Yellow 1 (gold 83.5 per cent). The surfaces of 40 buttons were sandblasted and the rest were silicoated. Forty cylinders each of F21 and Panavia EX were bonded to the prepared gold alloy surfaces and the specimens stored in distilled water for 24 hours. Half the specimens were then tested to failure using a shear test and the other half using a tensile test. The two cements achieved significantly higher shear and tensile bond strengths to the silicoated metal surfaces. Both cements attained similar shear bond strengths, but F21 achieved significantly stronger tensile bonds than Panavia EX to the differently treated metal surfaces. It is concluded that silicoating of high gold alloys is preferable to sandblasting for resin retention, and that bond strength data from different test methods are not comparable.