Modification History
Not Applicable
Unit Descriptor
Descriptor |
This unit of competency describes the skills and knowledge required to construct burn-out patterns for cast metal framework; and devest, trim, treat, finish and evaluate alloy structures All procedures are carried out in accordance with occupational health and safety policies and procedures, current infection control guidelines, Australian and New Zealand Standards, State/Territory legislative requirements and organisation policy |
Application of the Unit
Application |
This unit applies to work in dental technology |
Licensing/Regulatory Information
Not Applicable
Pre-Requisites
Pre-requisite units |
This unit must be assessed after successful achievement of pre-requisites:
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Employability Skills Information
Employability Skills |
This unit contains Employability Skills |
Elements and Performance Criteria Pre-Content
Elements define the essential outcomes of a unit of competency. |
The Performance Criteria specify the level of performance required to demonstrate achievement of the Element. Terms in italics are elaborated in the Range Statement. |
Elements and Performance Criteria
ELEMENT |
PERFORMANCE CRITERIA |
1. Prepare master model |
1.1 Read and interpret the prescription 1.2 Select alloy 1.3 Confirm the survey of model that has been carried out by the operator 1.4 Transfer design to master model 1.5 Block out undesirable undercuts 1.6 Create clasp ledges 1.7 Scribe food lines 1.8 Apply tissue relief 1.9 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 material in accordance with manufacturer's 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 burn out and preheat cycles for appropriate investment/alloy combination 4.2 Burn-out wax from investment mould and hold at recommended temperature for casting 4.3 Melt alloy and cast using appropriate materials, equipment and technique |
5. Devest, trim, finish and evaluate metallic 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 , 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 |
Required Skills and Knowledge
REQUIRED SKILLS AND KNOWLEDGE |
This describes the essential skills and knowledge and their level required for this unit. |
Essential knowledge : The candidate must be able to demonstrate essential knowledge required to effectively do the task outlined in elements and performance criteria of this unit, manage the task and manage contingencies in the context of the identified work role This includes knowledge of:
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Essential skills : It is critical that the candidate demonstrate the ability to
In addition, the candidate must be able to effectively do the task outlined in elements and performance criteria of this unit, manage the task and manage contingencies in the context of the identified work role This includes the ability to:
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Evidence Guide
EVIDENCE GUIDE |
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The evidence guide provides advice on assessment and must be read in conjunction with the Performance Criteria, Required Skills and Knowledge, the Range Statement and the Assessment Guidelines for this Training Package. |
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Critical aspects for assessment and evidence required to demonstrate this competency unit : |
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Context of and specific resources for assessment : |
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Method of assessment |
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Access and equity considerations : |
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Related units : |
This unit should be assessed in conjunction with the following related competency unit:
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Range Statement
RANGE STATEMENT |
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The Range Statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. |
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Alloys may include : |
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Tissue relief provided to areas of the oral mucosa which may include : |
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Melting /Casting techniques may include : |
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Visual examination of the cast alloy structure may include : |
Confirming that the cast:
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Trim and shape the alloy structure may include : |
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Checking the alloy structure may include but is not limited to : |
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Unit Sector(s)
Not Applicable