ABSTRACT
The effect of investment material on the casting accuracy of five base metal alloys was evaluated. Overall, the fit of the test castings was poor. Individual alloy-investment interaction appears to be significant. Although marketed for use with base metal alloys, it appears that investment manufacturers' recommended techniques require alteration to enhance the fit of base metal restorations.
Subject(s)
Dental Alloys , Dental Casting Investment , Dental Casting Technique/instrumentation , Surface PropertiesSubject(s)
Dental Alloys/analysis , Costs and Cost Analysis , Hardness , Hot Temperature , Humans , Military Dentistry , Tensile StrengthABSTRACT
Mechanical properties, electrochemical behavior, heat treatment response, micro-structural features, and compositions of two proprietary nickel-free, beryllium-free fixed prosthodontic alloys were studied. The alloys showed compositional and microstructural differences. Mechanical property values of Biocast and Neobond II are comparable with those of base metal alloys for removable partial dentures. The high hardness, high modulus of elasticity, and low elongation impede adjustment, adaptation of margins, and polishing of the final restoration.
