Elements and Performance Criteria
- Prepare master model
- Construct refractory model
- Wax and invest removable partial denture framework
- Transfer design outline correctly to the refractory model
- Select appropriate wax and pre-formed components
- Wax up patterns to the refractory cast consistent with the design
- Sprue the pattern using material of the correct size and in the correct shape and position for the material being cast and attach it to the investment former
- Select appropriate investment and technique according to the alloy
- Prepare investment material in accordance with manufacturer's instructions
- Treat the surface of the wax, patterns and sprues
- Allow for investment setting time in accordance with manufacturer's instructions
- Burnout and cast removable partial denture framework
- Devest, trim, finish and evaluate metallic structures for removable partial denture
- Visually examine the cast alloy structure, correctly identify any casting faults and assess the viability of the casting
- Remove sprues and trim and shape the alloy structure
- Treat the surface of the alloy using appropriate materials and equipment and finish using appropriate abrasives and polishes
- Position the cast on the master model and check accuracy of major connection and clasps and adjust any metal occlusal contacts with antagonist
- Decontaminate the denture framework according to infection control guidelines
- Dry the denture framework, replace on model and place in a sealed container for dispatch