Course Title: Construct cast metal alloy removeable partial denture framework

Part B: Course Detail

Teaching Period: Term2 2016

Course Code: DENT5786C

Course Title: Construct cast metal alloy removeable partial denture framework

School: 155T Vocational Health and Sciences

Campus: City Campus

Program: C5312 - Diploma of Dental Technology

Course Contact: Mark Doherty

Course Contact Phone: +61 3 9341 1407

Course Contact Email:

Name and Contact Details of All Other Relevant Staff

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:

1.1 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:

2.1 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:

3.1 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:

4.1 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:

5.1 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

  • Facilitator led discussions using Powerpoint presentations
  • In class activities
  • Simulated laboratory activities
  • Reading chapters form Anatomy of Orofacial Structures and answering questions

Teaching Schedule

The class is scheduled for delivery to the APPRENTICE group on the 5th April and NON-APPRENTICE GROUP on 17th February in the Lecture theatre of Building 154 RMIT (within the Royal Dental Hospital Melbourne) Notification will be provided via student email if the date or location change.

Following the delivery of the theory class, practical exercises will be undertaken in the laboratory.

Class schedules are detailed in the timetables provided on Blackboard (subject to change at the discrection of RMIT, in this event notification will be provided to your student email);

    Practical classes will be delivered in the simulated environment at RMIT where the Teacher will provide demonstration and assistance as you construct the following appliances.
  • Cobalt Chrome Framework (Wax-up) Mx & Md
  • Cobalt Chrome Framework (Cast & Finish)
  • You will be required to wax up both frameworks in case one of the frameworks does not cast into metal correctly. The process of constructing and finishing the cobalt chrome denture framework is very time consuming and as this is the case you will only have time to complete one case. If time permits within the course you will have an opportunity to cast the second waxed - up framework.

Learning Resources

Prescribed Texts

Anatomy of Orofacial Structures


Mosby's Dental Dictionary



Other Resources

  • Powepoint available on MYRMIT Blackboard under the program code C5312 and the Unit of Competence HLTDT509D/DENT5786C Construct cast metal alloy removable partial denture framework
  • 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

You will attempt the following practical exercises under supervision of the teacher and you will be graded with either a Px (Satisfactory) or NYC (Not Satisfactory) according to the assessment guidelines outlined in the practical exercise book; in accordance with the training package elements & essential skills.

  1. Cobalt Chrome Framework (Wax-up)
  2. Cobalt Chrome Framework (Cast & Finish)

Upon completion of an exercise and prior to submission for assessment, all exercises undertaken in the practical classes will require you to provide a detailed reflection of your own work focussing on areas of the appliance that were successful as well as areas that could be improved upon next time.

An Assignment will be required as part of the unit that will cover essential knowledge.

Assessment Matrix

To achieve a grade of CA (Competency Achieved) for the unit HLTDT509D/DENT5786C Construct cast metal alloy removable partial denture framework you are required to obtain a pass result (CA) for the following theoretical and practical assessments that are used to measure; elements, performance criteria, essential knowledge and essential skills as outlined in the health training package.


Failure to complete any of the above listed tasks/assessments will result in an NYC (not yet competent) result for unit HLTDT509D/DENT5786C Construct cast metal alloy removable partial denture framework. An NYC (not yet competent) result will be entered in the student record. This will result in non-completion of this unit of competence requiring re-enrolment incurring fees and a return to class work and completion of any relevant assessments at the time of the re-enrolment.

The scheduled dates for the assessments are as follows;

Apprentice (The assessment process must be finalised and a result entered by November 25th 2016)

Non-Apprentice (The assessment process must be finalised and a result entered by November 25th 2016)


Other Information


RMIT University requires that you present YOUR work for assessment. Plagiarism is a form of cheating. It is the presentation of the work or idea of another person. Plagiarism is NOT acceptable. Penalities can include charges of acedemic misconduct, cancellation of results and exclusion from your course.

Please note: It is also a disciplinary offence to allow your work to be plagiarised by another student. When signing the coversheet to submit your learning guides and assessments.

Special consideration:

Please note: Students may apply for Special Consideration as per the information via the RMIT website

if they believe 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.

RMIT assessment policies - RMIT University

Special consideration online application - RMIT University:

Non completion or non-submission of compulsory tasks:

Failure to complete any or all of the compulsory tasks listed above will prevent the student from achieving a CA (competency achieved) result for unit HLTDT509D/DENT5786C Construct cast metal alloy removable partial denture framework. This will result in the student not completing the unit successfully. NYC (not yet competent) will be recorded and re enrolment will be required to continue the unit/program. Fees will be incurred. Please note: A second opportunity for assessment will not be granted unless the student has applied for and been granted special consideration as per RMIT assessment policy.

Assessment Appeal Process:
The Appeals Against Assessment policy and procedure applies to all coursework programs in all careers. The appeal process is staged and students are required to follow each stage in order to ensure their full entitlement to appeal is available

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 laboratory 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 nail polish)
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.


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