Metallurgy and Casting Process

At the end of this course, students should be able to: 1. list the types of dental metallic materials; 2. outline the types of casting machines; 3. apply the knowledge of the properties of metals and the casting technique in the fabrication of metallic based dentures; 4. apply the principles of casting in the fabrication of metallic dentures; and 5. demonstrate the skill required in the casting process.

Historical development of metallic materials in dentistry, the metallurgy of dental metallic materials, production of dental metallic materials. Classification of metallic dental materials. Properties of metallic dental materials, – corrosion resistance, thermal conductivity, tarnishing, dimensional changes, malleability, ductility, impact strength, fatigue strength, work hardening, stress anneal, heat treatment, hardening heat treatment Materials for construction of metallic prosthodontic appliances - gold alloys, chromium cobalt, swaged stainless steel, and many others and suitability of each material for the prosthodontic appliance. and many others. Types of casting machines, Principles of fabrication, introductory foundry technology, casting, moulding and extrusion techniques, Densification and properties of compacts – bulk density, porosity and shrinkage, Thermal treatments, solidification, powder processing, hot isostatic precisions. Duplication of a model using refractory model materials, Casting failures, and how to avoid them.