Elements and Performance Criteria
- Elements define the essential outcomes
- 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 materials in accordance with manufacturers’ 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 alloy structures for removable partial denture
- Select and apply cooling cycle
- Remove the cast alloy structure from the investment without damaging the integrity of the structure
- Remove oxides using an appropriate abrasive or chemical treatment
- Visually examine the cast alloy structure and 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