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Evidence Guide: HLTDET008 - Construct cast alloy removable partial denture framework

Student: __________________________________________________

Signature: _________________________________________________

Tips for gathering evidence to demonstrate your skills

The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!

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HLTDET008 - Construct cast alloy removable partial denture framework

What evidence can you provide to prove your understanding of each of the following citeria?

Elements define the essential outcomes

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Prepare master model

  1. Read and interpret the work order
  2. Confirm the survey of model that has been carried out by the operator
  3. Transfer design to master model
  4. Block out undesirable undercuts
  5. Create clasp ledges
  6. Scribe food lines
  7. Apply tissue relief
  8. Apply saddle relief
Read and interpret the work order

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Confirm the survey of model that has been carried out by the operator

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Transfer design to master model

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Block out undesirable undercuts

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Create clasp ledges

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Scribe food lines

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Apply tissue relief

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Apply saddle relief

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Construct refractory model

  1. Duplicate master model in refractory material to produce an accurate copy of the model
  2. Construct sprue former as necessary
  3. Prepare the refractory model appropriately and apply an appropriate hardener or sealant
Duplicate master model in refractory material to produce an accurate copy of the model

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Construct sprue former as necessary

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Prepare the refractory model appropriately and apply an appropriate hardener or sealant

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Wax and invest removable partial denture framework

  1. Transfer design outline correctly to the refractory model
  2. Select appropriate wax and pre-formed components
  3. Wax up patterns to the refractory cast consistent with the design
  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
  5. Select appropriate investment and technique according to the alloy
  6. Prepare investment materials in accordance with manufacturers’ instructions
  7. Treat the surface of the wax, patterns and sprues
  8. Allow for investment setting time in accordance with manufacturer’s instructions
Transfer design outline correctly to the refractory model

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Select appropriate wax and pre-formed components

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Wax up patterns to the refractory cast consistent with the design

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

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

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Select appropriate investment and technique according to the alloy

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Prepare investment materials in accordance with manufacturers’ instructions

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Treat the surface of the wax, patterns and sprues

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Allow for investment setting time in accordance with manufacturer’s instructions

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Burnout and cast removable partial denture framework

  1. Select appropriate alloy according to work order
  2. Select burnout and preheat cycles for appropriate investment and alloy combination
  3. Burnout wax from investment mould and hold at recommended temperature for casting
  4. Melt alloy and cast using appropriate materials, equipment and techniques
Select appropriate alloy according to work order

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Select burnout and preheat cycles for appropriate investment and alloy combination

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Burnout wax from investment mould and hold at recommended temperature for casting

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Melt alloy and cast using appropriate materials, equipment and techniques

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Devest, trim, finish and evaluate alloy structures for removable partial denture

  1. Select and apply cooling cycle
  2. Remove the cast alloy structure from the investment without damaging the integrity of the structure
  3. Remove oxides using an appropriate abrasive or chemical treatment
  4. Visually examine the cast alloy structure and correctly identify any casting faults and assess the viability of the casting
  5. Remove sprues and trim and shape the alloy structure
  6. Treat the surface of the alloy using appropriate materials and equipment, and finish using appropriate abrasives and polishes
  7. Position the cast on the master model and check accuracy of major connection and clasps, and adjust any metal occlusal contacts with antagonist
  8. Decontaminate the denture framework according to infection control guidelines
  9. Dry the denture framework, replace on model and place in a sealed container for dispatch
Select and apply cooling cycle

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Remove the cast alloy structure from the investment without damaging the integrity of the structure

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Remove oxides using an appropriate abrasive or chemical treatment

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Visually examine the cast alloy structure and correctly identify any casting faults and assess the viability of the casting

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Remove sprues and trim and shape the alloy structure

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Treat the surface of the alloy using appropriate materials and equipment, and finish using appropriate abrasives and polishes

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Position the cast on the master model and check accuracy of major connection and clasps, and adjust any metal occlusal contacts with antagonist

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Decontaminate the denture framework according to infection control guidelines

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Dry the denture framework, replace on model and place in a sealed container for dispatch

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Evidence Guide

ELEMENT

PERFORMANCE CRITERIA

Elements define the essential outcomes

Performance criteria describe the performance needed to demonstrate achievement of the element.

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

Required Skills and Knowledge

ELEMENT

PERFORMANCE CRITERIA

Elements define the essential outcomes

Performance criteria describe the performance needed to demonstrate achievement of the element.

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

The candidate must show evidence of the ability to complete tasks outlined in elements and performance criteria of this unit, manage tasks and manage contingencies in the context of the job role. There must be evidence that the candidate has:

• followed a set of sequenced written instructions and manufacturers’ specifications for preparing materials used in a cast for removable alloy partial denture

• used standard precautions and safe work practices to construct 1 removable alloy framework that includes a combination of bounded and free end saddles

• critically evaluated the 1 cast for removable alloy partial denture produced to meet technical laboratory and patient requirements.

The candidate must be able to demonstrate essential knowledge required to effectively complete tasks outlined in elements and performance criteria of this unit, manage tasks and manage contingencies in the context of the work role. This includes knowledge of:

• Australian/New Zealand Standards, workplace health and safety (WHS) policies, Dental Board of Australia guidelines on infection control, Commonwealth and State/Territory legislation and organisation policies relating to dental laboratory work

• fundamental oral anatomy including:

- dentition – arrangement of the teeth, naming and coding of teeth

- structures of the oral cavity – hard and soft palate, lateral and posterior borders of the oral cavity, tongue and floor of the mouth

- teeth form and function

• dental alloys

• heat treatment

• melting and casting

• relevant material science for carrying out procedures

• solidification

• surface finishing