Assessor Resource

HLTDET001
Construct models

Assessment tool

Version 1.0
Issue Date: March 2024


This unit of competency describes the skills and knowledge required to construct models from impressions of the patient’s maxillary or mandibular jaws.

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.

You may want to include more information here about the target group and the purpose of the assessments (eg formative, summative, recognition)



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. 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 required

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 model materials in accordance with manufacturers’ 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 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 model to create a working model where required by work order

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:

• used standard precautions and safe work practices to prepare models, using a range of materials specifically prepared against written instructions and manufacturers’ instructions, for at least 4 different types of impressions (must be a combination of maxillary and mandibular arches):

- dentate

- partially dentate

- edentulous

• critically evaluated the 4 different types of models produced to meet technical laboratory and clinician 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 legislation and State/Territory legislation, and organisation policies relating to dental laboratory work

• requirements and organisation policies relating to dental laboratory work including:

- use of standard precautions to minimise risk

- use of personal protective equipment (PPE) including disposable gloves, laboratory coat and eye protection

- decontamination of impressions

- minimising hazardous manual tasks

- requirements for storage of model material

- safe disposal of packaging materials

• 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

• properties of elastic impression materials including:

- alginate impression material

- polyether impression material

- polysulphide impression material

- polyvinyl siloxane impression material

• properties of rigid impression materials including:

- impression compound

- zinc oxide-eugenol impression pastes

• desirable properties of model materials including:

- accurate reproduction of all details of the impression

- colour contrast with other materials used on them

- ease of manipulation

- sufficient strength and hardness

- suitability for use with all types of impression materials

• significance of study models for:

- dentate and partially dentate mouths

- edentulous mouths.

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

- impression materials

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

- PPE

- simulation models on which to construct impression models

- 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.


Submission Requirements

List each assessment task's title, type (eg project, observation/demonstration, essay, assingnment, 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. 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 required

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 model materials in accordance with manufacturers’ 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 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 model to create a working model where required by work order

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:

• used standard precautions and safe work practices to prepare models, using a range of materials specifically prepared against written instructions and manufacturers’ instructions, for at least 4 different types of impressions (must be a combination of maxillary and mandibular arches):

- dentate

- partially dentate

- edentulous

• critically evaluated the 4 different types of models produced to meet technical laboratory and clinician 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 legislation and State/Territory legislation, and organisation policies relating to dental laboratory work

• requirements and organisation policies relating to dental laboratory work including:

- use of standard precautions to minimise risk

- use of personal protective equipment (PPE) including disposable gloves, laboratory coat and eye protection

- decontamination of impressions

- minimising hazardous manual tasks

- requirements for storage of model material

- safe disposal of packaging materials

• 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

• properties of elastic impression materials including:

- alginate impression material

- polyether impression material

- polysulphide impression material

- polyvinyl siloxane impression material

• properties of rigid impression materials including:

- impression compound

- zinc oxide-eugenol impression pastes

• desirable properties of model materials including:

- accurate reproduction of all details of the impression

- colour contrast with other materials used on them

- ease of manipulation

- sufficient strength and hardness

- suitability for use with all types of impression materials

• significance of study models for:

- dentate and partially dentate mouths

- edentulous mouths.

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

- impression materials

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

- PPE

- simulation models on which to construct impression models

- 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.

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
 
Apply standard precautions when receiving, handling and working on dental materials 
Decontaminate impressions according to infection control guidelines 
Examine impressions for defects 
Check impressions to ensure they meet the specifications of the work order 
Handle impressions with care to avoid damage or distortion 
Ensure accompanying models are intact with no defects or adjustments required 
Prepare a range of impressions for pouring 
Select appropriate model materials 
Ensure all equipment used for mixing materials is clean 
Prepare model materials in accordance with desired outcomes 
Maintain and store model materials in accordance with manufacturers’ instructions 
Pour model materials into impressions in accordance with accepted techniques 
Allow required setting time 
Separate intact model from the impression. 
Inspect the model for defects 
Trim the model in accordance with requirements 
Duplicate the master model to create a working model where required by work order 

Forms

Assessment Cover Sheet

HLTDET001 - Construct models
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

Feedback to student

 

 

 

 

 

 

 

 

Assessor name:

Signature:

Date:


Assessment Record Sheet

HLTDET001 - Construct models

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:

Signature:

Date:

Student signature:

Date: