Unit of Competency Mapping – Information for Teachers/Assessors – Information for Learners

HLTDET008 Mapping and Delivery Guide
Construct cast alloy removable partial denture framework

Version 1.0
Issue Date: April 2024


Qualification -
Unit of Competency HLTDET008 - Construct cast alloy removable partial denture framework
Description
Employability Skills
Learning Outcomes and Application 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.
Duration and Setting X weeks, nominally xx hours, delivered in a classroom/online/blended learning setting.

Skills must have been demonstrated in a dental laboratory workplace or in a simulated dental laboratory environment that reflects workplace laboratory conditions. The following conditions must be met for this unit:

- use of suitable facilities, equipment and resources including

- access to work order

- Dental Board of Australia guidelines on infection control on which the candidate bases the planning process

- laboratory safety manuals and procedures in line with relevant Commonwealth and State/Territory legislation

- WHS policies on which the candidate bases the planning process.

Assessors must satisfy the Standards for Registered Training Organisations (RTOs) 2015/AQTF mandatory competency requirements for assessors.
Prerequisites/co-requisites
Competency Field
Development and validation strategy and guide for assessors and learners Student Learning Resources Handouts
Activities 		Slides
PPT 		Assessment 1 Assessment 2 Assessment 3 Assessment 4
Elements of Competency Performance Criteria              
Element: Elements define the essential outcomes
       
Element: Prepare master model
  • Read and interpret the work order
  • Confirm the survey of model that has been carried out by the operator
  • Transfer design to master model
  • Block out undesirable undercuts
  • Create clasp ledges
  • Scribe food lines
  • Apply tissue relief
  • Apply saddle relief
       
Element: Construct refractory model
  • Duplicate master model in refractory material to produce an accurate copy of the model
  • Construct sprue former as necessary
  • Prepare the refractory model appropriately and apply an appropriate hardener or sealant
       
Element: 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
       
Element: Burnout and cast removable partial denture framework
  • Select appropriate alloy according to work order
  • Select burnout and preheat cycles for appropriate investment and alloy combination
  • Burnout wax from investment mould and hold at recommended temperature for casting
  • Melt alloy and cast using appropriate materials, equipment and techniques
       
Element: 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
       


Evidence Required

List the assessment methods to be used and the context and resources required for assessment. Copy and paste the relevant sections from the evidence guide below and then re-write these in plain English.

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

Submission Requirements

List each assessment task's title, type (eg project, observation/demonstration, essay, assignment, checklist) and due date here

Assessment task 1: [title]      Due date:

(add new lines for each of the assessment tasks)

Assessment Tasks

Copy and paste from the following data to produce each assessment task. Write these in plain English and spell out how, when and where the task is to be carried out, under what conditions, and what resources are needed. Include guidelines about how well the candidate has to perform a task for it to be judged satisfactory.

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

Copy and paste from the following performance criteria to create an observation checklist for each task. When you have finished writing your assessment tool every one of these must have been addressed, preferably several times in a variety of contexts. To ensure this occurs download the assessment matrix for the unit; enter each assessment task as a column header and place check marks against each performance criteria that task addresses.

Observation Checklist

Tasks to be observed according to workplace/college/TAFE policy and procedures, relevant legislation and Codes of Practice Yes No Comments/feedback
 
Read and interpret the work order 
Confirm the survey of model that has been carried out by the operator 
Transfer design to master model 
Block out undesirable undercuts 
Create clasp ledges 
Scribe food lines 
Apply tissue relief 
Apply saddle relief 
Duplicate master model in refractory material to produce an accurate copy of the model 
Construct sprue former as necessary 
Prepare the refractory model appropriately and apply an appropriate hardener or sealant 
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 
Select appropriate alloy according to work order 
Select burnout and preheat cycles for appropriate investment and alloy combination 
Burnout wax from investment mould and hold at recommended temperature for casting 
Melt alloy and cast using appropriate materials, equipment and techniques 
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 

Forms

Assessment Cover Sheet

HLTDET008 - Construct cast alloy removable partial denture framework
Assessment task 1: [title]

Student name:

Student ID:

I declare that the assessment tasks submitted for this unit are my own work.

Student signature:

Result: Competent Not yet competent

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Assessment Record Sheet

HLTDET008 - Construct cast alloy removable partial denture framework

Student name:

Student ID:

Assessment task 1: [title] Result: Competent Not yet competent

(add lines for each task)

Feedback to student:

 

 

 

 

 

 

 

 

Overall assessment result: Competent Not yet competent

Assessor name:

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Student signature:

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