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Evidence Guide: HLTDT301D - Construct models

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!

From the Wiki University

 

HLTDT301D - Construct models

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

Verify integrity of impressions

  1. Apply standard precautions when receiving, handling and working on dental materials
  2. Decontaminate impressions according to infection control guidelines
  3. Examine impressions for defects
  4. Check impressions to ensure they meet the specifications of the work order
  5. Handle impressions with care to avoid damage or distortion
  6. Ensure accompanying models are intact with no defects or adjustments
  7. Prepare a range of impressions for pouring
Apply standard precautions when receiving, handling and working on dental materials

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Decontaminate impressions according to infection control guidelines

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Examine impressions for defects

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Check impressions to ensure they meet the specifications of the work order

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Handle impressions with care to avoid damage or distortion

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Ensure accompanying models are intact with no defects or adjustments

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Prepare a range of impressions for pouring

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Select and prepare model materials

  1. Select appropriate model materials
  2. Ensure all equipment used for mixing materials is clean
  3. Prepare model materials in accordance with desired outcomes
  4. Maintain and store modelmaterials in accordance with manufacturer's instructions
Select appropriate model materials

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Ensure all equipment used for mixing materials is clean

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Prepare model materials in accordance with desired outcomes

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Maintain and store modelmaterials in accordance with manufacturer's instructions

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Pour impressions

  1. Pour model materials into impressions in accordance with accepted techniques
  2. Allow required setting time
Pour model materials into impressions in accordance with accepted techniques

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Allow required setting time

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Finish model

  1. Separate an intact model from the impression
  2. Inspect the model for defects
  3. Trim the model in accordance with requirements
  4. Duplicate the master cast to create a working model where required by prescription
Separate an intact model from the impression

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Inspect the model for defects

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Trim the model in accordance with requirements

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Duplicate the master cast to create a working model where required by prescription

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

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

Required Skills and Knowledge

This describes the essential skills and knowledge and their level required for this unit.

Essential knowledge:

The candidate must be able to demonstrate essential knowledge required to effectively do the task outlined in elements and performance criteria of this unit, manage the task and manage contingencies in the context of the identified work role

This includes knowledge of:

Applied oral anatomy:

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

Infection control guidelines for the decontamination of impressions

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

The 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

The significance of study models for:

dentate and partially dentate mouths

edentulous mouths

Essential skills:

It is critical that the candidate demonstrate the ability to

Consistently prepare models from a range of impressions

Consistently prepare model materials

Consistently produce models suitable for the construction of dental prostheses or appliances

Consistently comply with current infection control guidelines, Australian Standards and legislative requirements as they relate to the dental technician's specific job role

Consistently comply with work health and safety (WHS) policies and procedures as they relate to the job role

In addition, the candidate must be able to effectively do the task outlined in elements and performance criteria of this unit, manage the task and manage contingencies in the context of the identified work role

This includes the ability to:

Consistently follow sequenced written instructions and manufacturer specifications for the preparation of materials

Critically evaluate all work produced so as to consistently meet both the technical requirements of the laboratory and client requirements

Select materials and procedures to prepare a range of impressions for pouring

Take into account opportunities to address waste minimisation, environmental responsibility and sustainable practice issues, including efficient use of power and other resources

Use safe work practices to minimise the risk of transmission of infection including:

consistently following the procedure for washing and drying hands

consistently limiting contamination

consistently maintaining clean receiving and work areas

consistently putting into practice clean techniques

consistently using personal protective equipment

Use literacy skills to read and follow directions, policies and procedures including:

infection control policies and procedures

laboratory policies and procedures

material safety data sheets

work health and safety (WHS) policies and procedures

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