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Evidence Guide: HLTDET002 - Construct custom impression trays

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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HLTDET002 - Construct custom impression trays

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 model

  1. Read and interpret the work order
  2. Block out undesirable undercuts
  3. Design the custom tray for the patient’s dentition and the intended impression material and technique
  4. Apply spacer material when required
Read and interpret the work order

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Block out undesirable undercuts

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Design the custom tray for the patient’s dentition and the intended impression material and technique

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Apply spacer material when required

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Select and prepare materials

  1. Select custom tray materials in accordance with the work order
  2. Prepare equipment for processing
  3. Provide appropriate mixing vessels and templates when required
Select custom tray materials in accordance with the work order

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Prepare equipment for processing

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Provide appropriate mixing vessels and templates when required

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Construct custom impression tray

  1. Apply appropriate separating medium in accordance with manufacturer’s instructions
  2. Mix or manipulate materials in accordance with the manufacturers’ instructions
  3. Adapt tray material to the model to the pre-determined peripheral outline
  4. Construct handle and attach according to operator requirements
  5. Process custom tray using the correct method for the correct material
  6. Separate the tray from the model in a manner that prevents damage and remove spacer material
  7. Trim the outline of the tray to shape
Apply appropriate separating medium in accordance with manufacturer’s instructions

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Mix or manipulate materials in accordance with the manufacturers’ instructions

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Adapt tray material to the model to the pre-determined peripheral outline

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Construct handle and attach according to operator requirements

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Process custom tray using the correct method for the correct material

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Separate the tray from the model in a manner that prevents damage and remove spacer material

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Trim the outline of the tray to shape

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Finish custom impression tray

  1. Smooth and refine the peripheries, handle and other surfaces of the tray
  2. Decontaminate the custom impression tray according to infection control guidelines
  3. Dry the custom tray and place in a sealed container for dispatch
Smooth and refine the peripheries, handle and other surfaces of the tray

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Decontaminate the custom impression tray according to infection control guidelines

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Dry the custom tray 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 model

1.1 Read and interpret the work order

1.2 Block out undesirable undercuts

1.3 Design the custom tray for the patient’s dentition and the intended impression material and technique

1.4 Apply spacer material when required

2. Select and prepare materials

2.1 Select custom tray materials in accordance with the work order

2.2 Prepare equipment for processing

2.3 Provide appropriate mixing vessels and templates when required

3. Construct custom impression tray

3.1 Apply appropriate separating medium in accordance with manufacturer’s instructions

3.2 Mix or manipulate materials in accordance with the manufacturers’ instructions

3.3 Adapt tray material to the model to the pre-determined peripheral outline

3.4 Construct handle and attach according to operator requirements

3.5 Process custom tray using the correct method for the correct material

3.6 Separate the tray from the model in a manner that prevents damage and remove spacer material

3.7 Trim the outline of the tray to shape

4. Finish custom impression tray

4.1 Smooth and refine the peripheries, handle and other surfaces of the tray

4.2 Decontaminate the custom impression tray according to infection control guidelines

4.3 Dry the custom tray 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 model

1.1 Read and interpret the work order

1.2 Block out undesirable undercuts

1.3 Design the custom tray for the patient’s dentition and the intended impression material and technique

1.4 Apply spacer material when required

2. Select and prepare materials

2.1 Select custom tray materials in accordance with the work order

2.2 Prepare equipment for processing

2.3 Provide appropriate mixing vessels and templates when required

3. Construct custom impression tray

3.1 Apply appropriate separating medium in accordance with manufacturer’s instructions

3.2 Mix or manipulate materials in accordance with the manufacturers’ instructions

3.3 Adapt tray material to the model to the pre-determined peripheral outline

3.4 Construct handle and attach according to operator requirements

3.5 Process custom tray using the correct method for the correct material

3.6 Separate the tray from the model in a manner that prevents damage and remove spacer material

3.7 Trim the outline of the tray to shape

4. Finish custom impression tray

4.1 Smooth and refine the peripheries, handle and other surfaces of the tray

4.2 Decontaminate the custom impression tray according to infection control guidelines

4.3 Dry the custom tray 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:

• read and correctly interpreted 4 work orders

• used standard precautions and safe work practices to fabricate custom trays, using a range of materials, for 4 different dentitions with desirable properties and design features including one each of the following (must be a combination of maxillary and mandibular arches):

- full dentition

- edentulous

- partial dentition including

o bounded saddle

o free end saddle

• critically evaluated the 4 custom impression trays 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, current Dental Board of Australia guidelines on infection control, Commonwealth and State/Territory legislation requirements 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

• properties of custom tray materials including:

- acrylic resins

- light-cured composite

• rationale for using space filling materials

• desirable properties and design features of custom impression trays including:

- a design that holds the impression material in the correct position in the mouth

- a design that supports the lips and cheeks so that the functional depth and shape of the sulcus is recorded

- a design that allows for positioning of the handle to avoid the lip during impression taking

- rigidity, strength, dimensional stability and smoothness

- spacing to permit the correct thickness of the impression material to be used.