Effect of investment on casting high-fusing alloys

Area of Science:

• Materials Science
• Biomaterials Science
• Dental Materials

Background:

• Phosphate-bonded investments are commonly used in dentistry for casting metal prosthetics.
• The interaction between investments and dental alloys can significantly impact casting quality.
• Understanding these interactions is crucial for predictable clinical outcomes.

Purpose of the Study:

• To investigate the interaction between three phosphate-bonded investments and four dental alloys.
• To evaluate the effect of investment-alloy combinations on casting completeness and surface quality.

Main Methods:

• Four different dental alloys were tested with three phosphate-bonded investments.
• Casting completeness was measured by the length of test specimens.
• Surface quality was assessed visually and comparatively.

Main Results:

• A significant interaction was observed between investments and alloys affecting castability.
• The high-gold alloy SMG II with Ceramigold investment produced the most complete castings.
• For nonprecious alloys, Biobond CB with Ceramigold II yielded the longest samples and smoothest surfaces.

Conclusions:

• Investment material significantly influences the castability and surface quality of dental alloys.
• Specific investment-alloy combinations are superior for achieving optimal casting results.
• Pre-clinical testing of alloy-investment compatibility is recommended for all dental materials, particularly nonprecious alloys.