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KMID : 1023820170090010052
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The Journal of Advanced Prosthodontics
2017 Volume.9 No. 1 p.52 ~ p.56
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Comparison of the bond strength of ceramics to Co-Cr alloys made by casting and selective laser melting
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Lawaf Shirin
Nasermostofi Shahbaz
Afradeh Mahtasadat
Azizi Arash
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Abstract
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PURPOSE: Considering the importance of metal-ceramic bond, the present study aimed to compare the bond strength of ceramics to cobalt-chrome (Co-Cr) alloys made by casting and selective laser melting (SLM).
MATERIALS AND METHODS: In this in-vitro experimental study, two sample groups were prepared, with one group comprising of 10 Co-Cr metal frameworks fabricated by SLM method and the other of 10 Co-Cr metal frameworks fabricated by lost wax cast method with the dimensions of 0.5 × 3 × 25 mm (following ISO standard 9693). Porcelain with the thickness of 1.1 mm was applied on a 3 × 8-mm central rectangular area of each sample. Afterwards, bond strengths of the samples were assessed with a Universal Testing Machine. Statistical analysis was performed with Kolmogorov-Smirnov test and T-test.
RESULTS: Bond strength in the conventionally cast group equaled 74.94 ± 16.06 MPa, while in SLM group, it equaled 69.02 ± 5.77 MPa. The difference was not statistically significant (P ≤ .05).
CONCLUSION: The results indicated that the bond strengths between ceramic and Co-Cr alloys made by casting and SLM methods were not statistically different.
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KEYWORD
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Bond strength, Co-Cr alloy, Selective laser melting, Metal-ceramic restorations
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