Comparison of Shear Bond and Failure Type on a Non-noble Metal Alloy Cast
Introduction: This in vitro study compared the shear bond strength and failure type produced by three surface treatments on a non-noble metal alloy cast.
Materials and methods: Ninety six cylinders cast in a non-noble metal alloy (Argeloy® N.P. Star, Argen®), grouped in pairs for 48 double specimens in total received three different surface treatments: no sandblasting control (group 1); sandblasting with 110-μm Al2O3 (group 2) and sandblasting with 50-μm Al2O3, (group 3). Each group was divided in two subgroups to be bound with two different resin based luting cements and metal conditioners (Monobond® Plus + Multilink® N, Ivoclar Vivadent®-ml; and Metal Primer ii + gcem, gc Corporation (gc). All specimens were aged in distilled water at a constant 37°C for 8 weeks and tested for shear bond strength. Failure type was examined by stereomicroscopy.
Results: The mean shear bond strengths (in MPa) after aging were 11.02 (control gc), 9.52 (control ml), 10.08 (50 gc), 11.72 (50 ml), 7.85 (110 gc), 8.12 (110 ml). There was a statistically significant difference among groups. The lower shear bond strength was for the group that was sandblasted with 110-μm Al2O3 for both cements.
Conclusion: In the metal to metal bonding protocol sandblasting is not required.
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