Unit of competency Outline
Date retreived
23/07/2026 1:19 AM AWST
23/07/2026 1:19 AM AWST
Whilst all efforts are made to provide accurate and timely information from the relevant source/documentation, please be aware that the information supplied may not be the most current version. The accuracy of the detail has not been confirmed by the Department and therefore should not be relied upon without first confirming the contents.
Construct models
Construct models
Unit of competency
National Code
HLTDT301D
HLTDT301D
State Code
WD122
WD122
TGA Status
Replaced
Replaced
DTWD Status
Replaced
Replaced
State Implementation and Classification
Approved Date
27/07/2012
Field of Education
060705 - Dental Technology
Original Release Date
27/07/2012
Nominal Hours
30
Description
DescriptorThis unit of competency describes the skills and knowledge required to construct models from impressions of the client's upper or lower jawsAll procedures are carried out in accordance with work health and safety (WHS) policies and procedures, current infection control guidelines, Australian and New Zealand Standards, state/territory legislative requirements and organisation policy
Notes
Elements and Performance Criteria
1. Verify integrity of impressions
- 1.1 Apply standard precautions when receiving, handling and working on dental materials
- 1.2 Decontaminate impressions according to infection control guidelines
- 1.3 Examine impressions for defects
- 1.4 Check impressions to ensure they meet the specifications of the work order
- 1.5 Handle impressions with care to avoid damage or distortion
- 1.6 Ensure accompanying models are intact with no defects or adjustments
- 1.7 Prepare a range of impressions for pouring
2. Select and prepare model materials
- 2.1 Select appropriate model materials
- 2.2 Ensure all equipment used for mixing materials is clean
- 2.3 Prepare model materials in accordance with desired outcomes
- 2.4 Maintain and store modelmaterials in accordance with manufacturer's instructions
3. Pour impressions
- 3.1 Pour model materials into impressions in accordance with accepted techniques
- 3.2 Allow required setting time
4. Finish model
- 4.1 Separate an intact model from the impression
- 4.2 Inspect the model for defects
- 4.3 Trim the model in accordance with requirements
- 4.4 Duplicate the master cast to create a working model where required by prescription
RANGE STATEMENT
The Range Statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance.
Standard precautions when receiving, handling and working on dental materials may include but is not limited to:
A dedicated clean area to receive incoming cases
Appropriate personal protection:
disposable gloves
apron
eye protection
mask where there is a risk of airborne transmission of infection
Cleaning reusable containers with detergent followed by disinfection
Decontamination of impressions
Disposal of all packaging materials in accordance with the waste regulations of State/Territory health and environmental authorities
Excluding all food and drink from the work area
Washing hands before leaving the work area
Decontamination of impression materials must include:
Cleaning in a mild detergent solution until all traces of blood and body fluids are removed, followed by rinsing
Rinsing impression in clean running water
Defects in impressions may include but are not limited to:
Blood and saliva contamination
Bubbles
Impression short in one or more regions
Poor adhesion of impression to tray
Tray flange showing through impression
The range of impressions may include:
Dentate impressions
Edentulous impressions
Model materials may include but are not limited to:
Epoxy resin
Plaster
Quick set stone
Regular stone
The preparation of model materialsmay include but is not limited to:
Equipment used for mixing is clean
The water-stone ratio as recommended by the manufacturer
The requirements for storage of model material may include but is not limited to:
Date of expiry as stated by manufacturer
Rotation of stock
Specific storage requirements including:
protection from light
storage temperature as recommended by the manufacturer
The poring of materials may include:
Techniques to exclude air from the mix:
mechanical spatulation
vibration
vacuum
Techniques to ensure elastic impression materials are not distorted
Trimming the model may include but is not limited to:
Trimming regular models so that:
the base is parallel to the occlusal plane
the sides are free from unrelated material
posterior borders are equal on maxillary and mandibular models so that models can stand when placed in a vertical position on bench
essential anatomical detail is retained
Trimming orthodontic models so that:
pre-set angles are maintained
The Range Statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance.
Standard precautions when receiving, handling and working on dental materials may include but is not limited to:
A dedicated clean area to receive incoming cases
Appropriate personal protection:
disposable gloves
apron
eye protection
mask where there is a risk of airborne transmission of infection
Cleaning reusable containers with detergent followed by disinfection
Decontamination of impressions
Disposal of all packaging materials in accordance with the waste regulations of State/Territory health and environmental authorities
Excluding all food and drink from the work area
Washing hands before leaving the work area
Decontamination of impression materials must include:
Cleaning in a mild detergent solution until all traces of blood and body fluids are removed, followed by rinsing
Rinsing impression in clean running water
Defects in impressions may include but are not limited to:
Blood and saliva contamination
Bubbles
Impression short in one or more regions
Poor adhesion of impression to tray
Tray flange showing through impression
The range of impressions may include:
Dentate impressions
Edentulous impressions
Model materials may include but are not limited to:
Epoxy resin
Plaster
Quick set stone
Regular stone
The preparation of model materialsmay include but is not limited to:
Equipment used for mixing is clean
The water-stone ratio as recommended by the manufacturer
The requirements for storage of model material may include but is not limited to:
Date of expiry as stated by manufacturer
Rotation of stock
Specific storage requirements including:
protection from light
storage temperature as recommended by the manufacturer
The poring of materials may include:
Techniques to exclude air from the mix:
mechanical spatulation
vibration
vacuum
Techniques to ensure elastic impression materials are not distorted
Trimming the model may include but is not limited to:
Trimming regular models so that:
the base is parallel to the occlusal plane
the sides are free from unrelated material
posterior borders are equal on maxillary and mandibular models so that models can stand when placed in a vertical position on bench
essential anatomical detail is retained
Trimming orthodontic models so that:
pre-set angles are maintained
EVIDENCE GUIDE
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.
Critical aspects for assessment and evidence required to demonstrate this competency unit:
The individual being assessed must provide evidence of specified essential knowledge as well as skills
Consistency of performance should be demonstrated over the required range of workplace situations
Context of and specific resources for assessment:
Assessment should replicate workplace conditions as far as possible
Simulations may be used to represent workplace conditions as closely as possible
Where, for reasons of safety, access to equipment and resources and space, assessment takes place away from the workplace, simulations should be used to represent workplace conditions as closely as possible
Method of assessment
Evidence of essential knowledge and understanding may be provided by:
traditional or online (computer-based) assessment
written assignments/projects
Case study and scenario as a basis for discussion of issues and strategies to contribute to best practice
Questioning
Staff and/or client feedback
Supporting statement of supervisor
Authenticated evidence of relevant work experience and/or formal/informal learning
Role play/simulation
Access and equity considerations:
All workers in the health industry should be aware of access and equity issues in relation to their own area of work
All workers should develop their ability to work in a culturally diverse environment
In recognition of particular health issues facing Aboriginal and Torres Strait Islander communities, workers should be aware of cultural, historical and current issues impacting on health of Aboriginal and Torres Strait Islander people
Assessors and trainers must take into account relevant access and equity issues, in particular relating to factors impacting on health of Aboriginal and/or Torres Strait Islander clients and communities
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.
Critical aspects for assessment and evidence required to demonstrate this competency unit:
The individual being assessed must provide evidence of specified essential knowledge as well as skills
Consistency of performance should be demonstrated over the required range of workplace situations
Context of and specific resources for assessment:
Assessment should replicate workplace conditions as far as possible
Simulations may be used to represent workplace conditions as closely as possible
Where, for reasons of safety, access to equipment and resources and space, assessment takes place away from the workplace, simulations should be used to represent workplace conditions as closely as possible
Method of assessment
Evidence of essential knowledge and understanding may be provided by:
traditional or online (computer-based) assessment
written assignments/projects
Case study and scenario as a basis for discussion of issues and strategies to contribute to best practice
Questioning
Staff and/or client feedback
Supporting statement of supervisor
Authenticated evidence of relevant work experience and/or formal/informal learning
Role play/simulation
Access and equity considerations:
All workers in the health industry should be aware of access and equity issues in relation to their own area of work
All workers should develop their ability to work in a culturally diverse environment
In recognition of particular health issues facing Aboriginal and Torres Strait Islander communities, workers should be aware of cultural, historical and current issues impacting on health of Aboriginal and Torres Strait Islander people
Assessors and trainers must take into account relevant access and equity issues, in particular relating to factors impacting on health of Aboriginal and/or Torres Strait Islander clients and communities
Replaces
| State Code | National Code | Title | Type |
|---|---|---|---|
| D8180 | HLTDT301C | Construct models | Unit of competency |
Replaced By
| State Code | National Code | Title | Type |
|---|---|---|---|
| AWA31 | HLTDET001 | Construct models | Unit of competency |
| State Code | National Code | Title | Type |
|---|---|---|---|
| J092 | HLT43012 | Certificate IV in Dental Assisting | Qualification |
| J067 | HLT32712 | Certificate III in Dental Laboratory Assisting | Qualification |
| J102 | HLT50512 | Diploma of Dental Technology | Qualification |