Course Title: Construct custom impression trays

Part B: Course Detail

Teaching Period: Term2 2013

Course Code: DENT5782C

Course Title: Construct custom impression trays

School: 155T Life & Physical Sciences

Campus: City Campus

Program: C5312 - Diploma of Dental Technology

Course Contact : Mark Doherty

Course Contact Phone: +61 3 93411407

Course Contact

Name and Contact Details of All Other Relevant Staff

Nicholas Greer

P: 9341 1420



Zanne Frazer

P: 9341 1402



James Moser

P:9341 1417



Narelle Tobin

P: 9341 1403


Nominal Hours: 15

Regardless of the mode of delivery, represent a guide to the relative teaching time and student effort required to successfully achieve a particular competency/module. This may include not only scheduled classes or workplace visits but also the amount of effort required to undertake, evaluate and complete all assessment requirements, including any non-classroom activities.

Pre-requisites and Co-requisites

HLTIN301C Comply with infection control policies and procedures
HLTWHS200A Participate in WHS processes

Course Description

This unit of competency describes the skills and knowledge you require to construct special trays to accurately record oral tissues. Custom or special trays as they are often referred to in the Dental industry, are constructed on a primary model to provide a custom fit for a patient, they are then used by a clinician to record a more accurate impression of a patients oral tissue.
All procedures are carried out in accordance with occupational health and safety policies and procedures, current infection control guidelines, Australian and New Zealand Standards, State/Territory legislative requirements and organisation policy.

National Codes, Titles, Elements and Performance Criteria

National Element Code & Title:

HLTDT302D Construct custom impression trays


1. Prepare model

Performance Criteria:

1. Prepare model
1.1 Read and interpret the prescription
1.2 Block out undesirable undercuts
1.3 Design the custom tray for the client's dentition and the intended impression material and technique
1.4 Apply spacer material as required


2. Select and prepare materials

Performance Criteria:

2. Select and prepare materials
2.1 Select custom tray materials in accordance with the prescription
2.2 Prepare equipment for processing
2.3 Provide appropriate mixing vessels and templates if required


4. Finish custom impression tray

Performance Criteria:

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


3. Construct custom impression tray

Performance Criteria:

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 manufacturer's instructions
3.3 Adapt tray material to the model to the pre-determined peripheral outline
3.4 Construct handle and finger rests 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 cast in a manner that prevents damage and remove spacer material
3.7 Trim the outline of the tray to shape

Learning Outcomes

On completion of this course you will have the ability consistently construct a range of special trays out of two different types of material that would be used in the industry for patients who are edentulous (without teeth)  partially dentate (some teeth missing) or for a patient requiring treatment with implants.

Details of Learning Activities

Participation in group activities based on a simulated workplace exercises.
Practical exercises
Individual exercises carrying out requirements of competency.
Student experiences in workplace “on job training”

Teaching Schedule

Practical: Various sessions delivered dependenat on the group.

Learning Resources

Prescribed Texts

Anatomy of Orofacial Structures


Mosby's Dental Dictionary



Other Resources

  • RMIT online learning Hub
  • Library
  • Internet links
  • Primal Pictures
  • Journals, Brochures, Pamphlets, Newspapers, Magazines

Overview of Assessment

You will be assessed in simulated workplace and under the normal range of work conditions.

You will be assessed on both the essential knowledge and the demonstration of skills through;

  1. Completion of practical exercises - including detailed self reflection of each exercise
  2. Practical exam
  3. Theory exam

Assessment Tasks


  1. Dentate ’Ivolen’ special tray for crown
  2. Edentulous ’Ivolen’ special tray 

Assessment guidelines for the practical competencies, as outlined in the practical exercise book.

Theoretical examination

Models, Dies and Trays incorporating Construct Orthodontic Study Models

Each subject is one element of the 3 hour exam (divided into competencies) PASS MARK 60%, If ’NYC’ (Not Yet Competent) result is achieved the student will be provided with detailed feedback of the shortcomings and given a further opportunity to sit a secondary exam.

If a grade of 40% or less is achieved the student will NOT be granted an opportunity to sit a secondary exam and the student will be required to re-enroll in the unit which will be incurr fees.

Please note: A subsequent NYC result for any of above mentioned assessments may require the student to attend further class work within their enrolment period or may result in the student re-enrolling in the unit which will be incurring fees.

Assessment Matrix

Other Information

Please Note: Students may apply for Special Consideration as (per the information provided in the Student Handbook ) via the RMIT Hub @ http:/ consideration if they believe their ability to complete Assessment for this Unit by the submission date has been affected by factors beyond their control. Special Consideration must be lodged prior to or within 48 hours of the scheduled assessment time or assessment submission date.

The application for Special Consideration is NOT granted automatically on application.

Students are required to support the learning outcomes this Unit with work based experience and/ or further self managed research to support positive outcomes in this Unit.

To undertake practical exercises and /or assessment students MUST present for the assessment process as follows:

Please note these are also WH&S requirements for clinical safety.

In appropriate practical class attire (Protective clothing for legs - if shorts, must cover knees, lab coat, safety glasses)
Fully covered in leather(not suede) footwear

Hair to be contained by tying back or in appropriate hair cover.
No artificial fingernails to be worn
The wearing of henna is acceptable.
Short, clean fingernails
No jewellery to be worn on the hands or wrists. Wedding rings or jewellery that cannot be removed for cultural reasons must be taped with an appropriate waterproof tape
All cuts/ skin abrasions on the hands or wrists must be covered with a waterproof dressing

A student that is non-compliant with any of the above requirements will not be permitted to undertake practical exercises or assessment at the scheduled time. The student will be rescheduled to undertake assessment at a later date.


Course Overview: Access Course Overview