Abstract
Statement of problemA high metal-ceramic bond strength is important for successful dental restorations. However, studies on the evaluation of the bond strength of porous metal–ceramic restorations compared with conventional ones are scarce. PurposeThe purpose of this in vitro study was to compare the bond strength of a porous metal–ceramic structure with conventional metal-ceramic restorations. Material and methodsTen porous specimens were fabricated by selective laser sintering (SLS) according to the International Organization for Standardization 9693-1:2012, 10 specimens without porosity by SLS, and 10 cobalt-chromium (Co-Cr) cast specimens without porosity. The ceramic was applied with the pressing method. A 3-point bend test was performed with a universal testing machine, and the data were statistically analyzed by using 1-way analysis of variance (α=.05). ResultsThe mean ±standard deviation bond strength of the porous group fabricated by SLS was the lowest (35.6 ±9.1 MPa), that of the group without porosity in the casting method was 43.5 ±7.8 MPa, and that of the group without porosity fabricated by SLS was the highest (47.7 ±4.5 MPa); these were statistically similar (P=.058). ConclusionsAlthough the porous structure reported the lowest bond strength among the 3 sets of test specimens, its bond strength was higher than the International Standards Organization standard of 25 MPa.
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