Method: (1) Aquarius Hard, a high-gold alloy (86.1Au-8.5Pt-2.6Pd-1.4In), (2) Evolution Lite, a reduced-gold alloy (40.3Au-39.3Pd-9.3In-9.2Ag-1.8Ga), (3) Callisto 75 Pd, a Pd-Ag-containing alloy (75.2Pd-2.5Au-7.1Ag-9.3Sn-1.0In), and (4) Aries, a conventional Pd-Ag alloy (63.7Pd-26.0Ag-7.0Sn-1.8Ga-1.5In) were selected for bonding to the veneering porcelain (IPS InLine) using the PoM technique. All products are marketed by Ivoclar Vivadent. Ten metal-ceramic specimens meeting the ISO 9693 standard were prepared for each alloy using recommended manufacturer techniques, and the three-point bending test in the ISO standard was used to determine bond strength. Values for the alloys were compared using one-way ANOVA (α = 0.05 for statistical significance).
Result: Mean values with standard deviations for bond strength (units of MPa) were as follows: Aquarius Hard (33.7 ± 11.5); Evolution Lite (34.9 ± 4.5); Callisto 75 Pd (37.2 ± 11.9); Aries (30.7 ± 10.8). There was no significant difference (p > 0.05) in the bond strength for the four alloys.
Conclusion: All four alloys had mean metal-ceramic bond strengths that substantially exceeded the 25 MPa minimum in the ISO standard, although one Aries specimen had a lower value than 25 MPa. It is important to note that the PoM technique for porcelain is not recommended by the manufacturer for alloys containing over 10% Ag.
Keywords: Alloys, Physical, Porcelain systems, Prosthodontics and Stress