Course Title: Construct cast metal alloy removeable partial denture framework

Part B: Course Detail

Teaching Period: Term2 2013

Course Code: DENT5786C

Course Title: Construct cast metal alloy removeable partial denture framework

School: 155T Life & Physical Sciences

Campus: City Campus

Program: C5312 - Diploma of Dental Technology

Course Contact : Mark Doherty

Course Contact Phone: +61 3 9341 1407

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: 80

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

HLTDT301D Construct models
HLTDT302D Construct custom impression trays
HLTDT303D Construct registration rims
HLTDT304D Articulate models and transfer records
HLTDT519C Construct simple complete removable acrylic dentures and appliances
HLTIN301C Comply with infection control policies and procedures

Course Description

This unit of competency describes the skills and knowledge you will require to construct burn-out patterns for cast metal framework; and devest, trim, treat, finish and evaluate alloy structures. The metal frameworks that you construct would be used in industry as the sub structure of a removable partial denture for a patient. The metal structures you fabricate are created from Cobalt Chrome and are incredibly strong, thus making them the perfect framework fro a denture.

National Codes, Titles, Elements and Performance Criteria

National Element Code & Title:

HLTDT509D Construct cast metal alloy removeable partial denture framework


1. Prepare master model

Performance Criteria:

1. Prepare master model
1.1 Read and interpret the prescription
1.2 Select alloy
1.3 Confirm the survey of model that has been carried out by the operator
1.4 Transfer design to master model
1.5 Block out undesirable undercuts
1.6 Create clasp ledges
1.7 Scribe food lines
1.8 Apply tissue relief
1.9 Apply saddle relief


2. Construct refractory model

Performance Criteria:

2. Construct refractory model
2.1 Duplicate master model in refractory material to produce an accurate copy of the model
2.2 Construct sprue former as necessary
2.3 Prepare the refractory model appropriately and apply an appropriate hardener or sealant


3. Wax and invest removable partial denture framework

Performance Criteria:

3. Wax and invest removable partial denture framework
3.1 Transfer design outline correctly to the refractory model
3.2 Select appropriate wax and pre-formed components
3.3 Wax up patterns to the refractory cast consistent with the design
3.4 Sprue the pattern using material of the correct size and in the correct shape and position for the material being cast and attach it to the investment former
3.5 Select appropriate investment and technique according to the alloy
3.6 Prepare investment material in accordance with manufacturer's instructions
3.7 Treat the surface of the wax, patterns and sprues
3.8 Allow for investment setting time in accordance with manufacturer's instructions


4. Burnout and cast removable partial denture framework

Performance Criteria:

4. Burnout and cast removable partial denture framework
4.1 Select burn out and preheat cycles for appropriate investment/alloy combination
4.2 Burn-out wax from investment mould and hold at recommended temperature for casting
4.3 Melt alloy and cast using appropriate materials, equipment and technique


5. Devest, trim, finish and evaluate metallic structures for removable partial denture

Performance Criteria:

5. Devest, trim, finish and evaluate metallic structures for removable partial denture
5.1 Select and apply cooling cycle
5.2 Remove the cast alloy structure from the investment without damaging the integrity of the structure
5.3 Remove oxides using an appropriate abrasive or chemical treatment
5.4 Visually examine the cast alloy structure, correctly identify any casting faults and assess the viability of the casting
5.5 Remove sprues and trim and shape the alloy structure
5.6 Treat the surface of the alloy using appropriate materials and equipment and finish using appropriate abrasives and polishes
5.7 Position the cast on the master model and check accuracy of major connection and clasps and adjust any metal occlusal contacts with antagonist
5.8 Decontaminate the denture framework according to infection control guidelines
5.9 Dry the denture framework, replace on model and place in a sealed container for dispatch

Learning Outcomes

On completion of this course you will be able to demonstrate, on a consistent basis, the process undertaken to adapt a prescription drawing of a partial denture framework design into a tangible dental appliance. You will develop the skills adaptable to a range of situations to suit  the needs of various patients and clinicians to provide successful dental treatment.

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

Theory: HLTDT509D Construct cast metal alloy partial denture framework  05/072013 (0830 -1230 - 2 hours & Metallurgy 05/07/2013 1330-1700 - 3.5 hours)

(in conjunction with HLTDT508C Construct removable acrylic partial dentures)

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 a simulated workplace and under the normal range of work conditions.

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

Completion of practical exercises - including detailed self reflection of each exercise
Practical exam
Theory exam


Assessment Tasks

Practical exercises:

  1. Cast Co/Cr Maxillary & Mabdibular Partial Denture Frameworks (Only 1 to be heat cured)
  2. Cast Co/Cr Addition, Laser Weld and Self Cure

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

Theoretical examination

Construct cast metal alloy partial denture framework

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