UNIT 12 - Complex Dental Materials Science
Assessment Activity Front Sheet
This front sheet must be completed by the learner where appropriate and included with the
work submitted for assessment.
Learner Name
Assessor Name Simon Brain
Date Issued 12/09/11
Qualification:
Unit
First submission date 27/03/12
1st Submitted on(date)
Completion date
Completed on
16/04/12
BTEC Extended Diploma in Dental Technology
12: Complex Dental Materials Science 3/4
Assessment Title – The characteristics and uses of refractory materials
In this assessment you will have opportunities to provide evidence against the following
criteria. Indicate the page numbers where the evidence can be found.
Criteria
To achieve the criteria the evidence must show
reference that the student is able to:
Task
no.
P7
list the constituents, properties and uses of the
commonly used dental refractory materials
1
M5
outline how the expansion of refractory materials
can be controlled by chemical and physical methods
2
D5
discuss the faults which can occur through incorrect
use of refractory materials and describe the cost
implications of this
3
Page
numbers
Learner Declaration
I certify that the work submitted for this assignment is my own and research sources are
fully acknowledged.
Learner signature:
Date:
Unit Title: Complex Dental Materials
Science
Start date:
Deadline date:
Assessment feedback will be provided by:
Assessor:
Assignment Title – The characteristics and uses of refractory materials
The purpose of this assignment is to:
Enable the learner to provide evidence of their knowledge of refractory materials used in
the lost wax process and to give an account of their characteristics and uses.
Scenario
You are competent at waxing up restorations and now have the opportunity to proceed to
the next stage in the construction process of fixed Prosthodontic restorations. You will work
shadow a member of staff who is competent in the use of the various refractory materials
and you will have the opportunity to select and invest waxed up patterns for the direct
technique.
Task 1
There are different types of refractory materials on the market but their constituents and
properties differ for certain reasons. Using a chart identify the commonly used refractory
materials, their uses, constituents and properties.
o
o
o
o
Gypsum bonded, and phosphate bonded
Constituents and properties of each type
Effects of constituents on properties; refractory’s for fixed and removable Prosthodontics
Investments for ceramic work and soldering; surface mould finish and mould porosity; controlling
expansion
This provides evidence for P7
Task 2
Explain the expansion mechanisms related to refractory materials and how it can be
controlled by recognised methods, include hygroscopic expansion.
o
o
Terms and characteristics
Refractory and binder; compensation expansion; heating cycles and breakdown
This provides evidence for M5
Task 3
If refractory materials are not handled and used correctly then problems will occur during
investing, burnout and casting. Describe the reasons why this may happen, include: the
implications to the laboratory and surgery regarding time and cost.
o
o
o
Manipulation techniques; hardening refractory materials; setting and heating
Removal from cast devices; safe storage, handling and disposal; environmental considerations;
cost analysis
Health and safety considerations; quality assurance
This provides evidence for D5
Sources of information
Textbooks
Anusavice KJ – Phillip’s Science of Dental Materials, 11th edition (WB Saunders, 2003) ISBN
0721693873
Craig RG and Powers JM – Restorative Dental Materials, 11th edition (Mosby, 2001) ISBN
0323014429
Gladwin MA and Bagby M – Clinical Aspects of Dental Materials (Lippincott Williams and Wilkins)
ISBN 0781743443
Anderson JN – Applied Dental Materials, 8th edition (Blackwell Science, 1998) ISBN 0632042087
Van Noort R – Introduction to Dental Materials, 2nd edition (C.V Mosby, 2002) ISBN 0723432155
McCabe
Journals
The British Dental Journal
Nature Publishing Group
The Dental Technician
AE Morgan Publications Ltd.
Dental Technologies
CRG Publications
Websites
www.bracon.co.uk Bracon Dental Suppliers
www.dentalexcellencetech.com Fundamentals of Esthetics (Dents TW Media)
www.dentalexcellencetech.com Shades, a World of Colour (Dents TW Media)
www.derweb.co.uk Dental Education Resources
www.dla.org.uk Dental Laboratories Association
www.dta-uk.org Dental Technicians Association
www.metrodent.co.uk Metrodent Dental Supplier
www.qjdt.co.uk Quintessence Journal of Dental Technology
www.us.elsevierhealth.com Journal of Prosthetic Dentistry
www.zahndental.com Zahn Dental Suppliers
Grading criteria
targeted
Met?
comments
P7
M5
D5
TUTOR COMMENTS:
I confirm this is all my own
work.
Tutors Signature
Signed:
Date Set: 12/09/11
Date due First submission:
Date due Final submission:
Additional Action due
to late submission.
Date handed in First
Submission:
Date marked:
Date resubmitted
Date remarked