Unit of competency Outline

Date retreived
23/07/2026 6:48 AM AWST

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Construct cast alloy removable partial denture framework

Construct cast alloy removable partial denture framework

Unit of competency
National Code
HLTDET008
State Code
AWA24
TGA Status
Current
DTWD Status
Approved
Current Release Number
1.00
Current Release Date
08/12/2015
View on TGA
State Implementation and Classification
Approved Date
22/06/2016
Field of Education
060705 - Dental Technology
Original Release Date
22/06/2016
Nominal Hours
70
Description
This unit of competency describes the skills and knowledge required to construct burnout patterns for cast metal framework and to devest, trim, treat, finish and evaluate alloy structures.This unit applies to work in dental technology.The skills in this unit must be applied in accordance with Commonwealth and State/Territory legislation, Australian/New Zealand Standards and industry codes of practice.
Notes
Elements and Performance Criteria
1. Prepare master model
  • 1.1 Read and interpret the work order
  • 1.2 Confirm the survey of model that has been carried out by the operator
  • 1.3 Transfer design to master model
  • 1.4 Block out undesirable undercuts
  • 1.5 Create clasp ledges
  • 1.6 Scribe food lines
  • 1.7 Apply tissue relief
  • 1.8 Apply saddle relief
2. Construct refractory model
  • 2.1 Duplicate master model in refractory material to produce an accurate copy of the model
  • 2.2 Construct sprue former as necessary
  • 2.3 Prepare the refractory model appropriately and apply an appropriate hardener or sealant
3. Wax and invest removable partial denture framework
  • 3.1 Transfer design outline correctly to the refractory model
  • 3.2 Select appropriate wax and pre-formed components
  • 3.3 Wax up patterns to the refractory cast consistent with the design
  • 3.4 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
  • 3.5 Select appropriate investment and technique according to the alloy
  • 3.6 Prepare investment materials in accordance with manufacturers’ instructions
  • 3.7 Treat the surface of the wax, patterns and sprues
  • 3.8 Allow for investment setting time in accordance with manufacturer’s instructions
4. Burnout and cast removable partial denture framework
  • 4.1 Select appropriate alloy according to work order
  • 4.2 Select burnout and preheat cycles for appropriate investment and alloy combination
  • 4.3 Burnout wax from investment mould and hold at recommended temperature for casting
  • 4.4 Melt alloy and cast using appropriate materials, equipment and techniques
5. Devest, trim, finish and evaluate alloy structures for removable partial denture
  • 5.1 Select and apply cooling cycle
  • 5.2 Remove the cast alloy structure from the investment without damaging the integrity of the structure
  • 5.3 Remove oxides using an appropriate abrasive or chemical treatment
  • 5.4 Visually examine the cast alloy structure and correctly identify any casting faults and assess the viability of the casting
  • 5.5 Remove sprues and trim and shape the alloy structure
  • 5.6 Treat the surface of the alloy using appropriate materials and equipment, and finish using appropriate abrasives and polishes
  • 5.7 Position the cast on the master model and check accuracy of major connection and clasps, and adjust any metal occlusal contacts with antagonist
  • 5.8 Decontaminate the denture framework according to infection control guidelines
  • 5.9 Dry the denture framework, replace on model and place in a sealed container for dispatch
No information
No information
Replaces
State Code National Code Title Type
WD130 HLTDT509D Construct cast metal alloy removeable partial denture framework Unit of competency
State Code National Code Title Type
AZA1 HLT55115 Diploma of Dental Technology Qualification
BDQ5 HLT55118 Diploma of Dental Technology Qualification