PubMed · 4872248
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H Ritze. 1967. [Fundamentals in embedding and casting technics].. https://pubmed.ncbi.nlm.nih.gov/4872248/
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OBJECTIVES: The corrosion resistance of a series of 51 dental alloys and pure metals was evaluated by coulometric analysis. METHODS: The method consisted of dividing the anodic polarization curves into three separate zones: zone I, from the open-circuit potential (after 24 h immersion) up to +300 mV (SCE): zone II, from 300 mV to 700 mV (SCE): zone III, +700 mV to 1000 mV (SCE). The surfaces below the curves are integrated for each zone and the results expressed in millicoulombs (mC). RESULTS AND CONCLUSIONS: Although the intensity of degradation in the mouth may vary from patients to patient, we think that a potential danger may occur in zones I and II in particular. Coulometric analysis reveals that: (i) the alloys for the porcelain-fused-to metal (PFM) technique have a better corrosion resistance (2.58 mC on average for the sum of the three zones, against 283.7 mC for conventional alloys): (ii) the elements Cu, Ag and Ni reduce the corrosion resistance of gold-based alloys: (iii) within the same class, single-phase alloys resist better than two-phase alloys.
The optimal conditions for opaquing techniques during porcelain application have not been confirmed. In this study the metal-ceramic bond strength was measured among one porcelain and three dental alloys, namely a gold-platinum-palladium alloy, a silver-free gold-palladium alloy, and a base metal alloy, with two opaquing techniques (a single masking layer versus a thin overfired layer followed by a second masking layer). In addition, the opaque porcelain was fired over an oxidized and nonoxidized alloy surface for the silver-free gold-palladium alloy. No significant differences in bond strength were recorded between the two opaquing techniques with the gold-platinum-palladium and base metal alloys. There was no substantial differences between the two opaquing techniques when opaque was applied over an oxidized gold-palladium alloy surface and bond strengths were substantially greater over an oxidized surface. However, when the opaque was applied to a nonoxidized gold-palladium surface the two-layer technique created a significantly greater bond strength.
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