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RPD – The System of Design

This is my lecture on Removable Partial Dentures. It includes a StarTrek theme to the lecture. It has a sound recording as well
by

Damien Walmsley

on 18 October 2015

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Transcript of RPD – The System of Design

Saddles
rests on and covers alveolar ridge and includes artificial teeth and gumwork
References
Search on "Davenport JC" and "partial dentures" to find articles.
http://www.dental-update.co.uk/articleMatchListArticle.asp?aKey=850
Dental Update is available on line at the University of Birmingham elibrary.

Print subscription is £36 for students

You need to be logged in to access the following articles
http://www.dental-update.co.uk/articleMatchListArticle.asp?aKey=943
http://www.dental-update.co.uk/articleMatchListArticle.asp?aKey=328
There are many other articles
just search on partial dentures
https://www.bda.org/students/publications/Pages/bdjbooksv2.aspx
System of Design
Professor Damien Walmsley
Learning objectives

Understand
Decision making process for Removable Partial Dentures
Stages of Partial Denture Design
Communicate
Design instructions to Laboratory
Design Stages

(after surveying mounted and articulated casts)
Consider the following
design of occlusal surface
base extension
polished surface
material for fitting surface
saddle/abutment tooth junction
Support
Classification

Vertical masticatory force resisted by

mucosa
tooth
tooth mucosa
Quality of support

type of support available may
vary and assessment of its quality is
made during design procedures
root area of the abutment teeth
extent of the saddles
expected force on the saddles
Kanno T, Carlsson GE.
A review of the shortened dental arch concept focusing on the work
by the Kayser/Nijmegen group. J Oral Rehabil. 2006;33:850-62
Does it work?
The shortened dental arch concept was accepted by a great majority of dentists but not widely practised

The shortened dental arch concept deserves to be included in all treatment planning for partially edentulous patients
Shortened Dental Arch
Retention
Reciprication
and bracing

Connection
Indirect
Retention

Types of Retention

Clasps
Neuromuscular forces
Physical forces
Guide Surfaces
Other devices
Factors affecting clasp choice

Position of undercut
Periodontal status
Sulcus shape
Clasp length
Appearance
influenced by
Material
Length
Cross section
Flexibility of clasp
Clasp
metal arm which retains, or stabilises,
a denture by contacting a tooth
Occlusal approaching
tooth movement
escape
Prevents
Reciprocation
Lower Arch Designs
Lingual bar
Sublingual bar
Lingual plate
Continuous or dental bar
Labial bar
Upper arch designs
Anterior bar
Posterior bar
Mid palatal bar
Support for Indirect retainer
Tooth support
Mucosa support
Effort Arm
Resistance Arm
Displacing
force
Clasp
Indirect
retainer
E
R
F
Omit the last tooth
Reduce area of occlusal table
Use narrow posterior teeth
Acrylic Dentures are mucosa borne
Please read dental update article by Professor Walmsley on "Acrylic Dentures"
Gingival approaching
Go to http://findit.bham.ac.uk/
Search for Dental Update
Look and click on the online access
Input your Uni name and password
Click on Go
Front page of Dental Update will appear
Search for "Acrylic Dentures"
Two
materials
Cast clasp
too short to
be flexibleshould be
gingival approaching
Wrought Clasp
Flexible at short length
held in acrylic
Gingival Clasp
not appropriate
deep undercut
and causes
trauma
Gold or wrought stainless steel

vs Cast Cobalt Chrome
Tooth coloured
composite clasps
Suitable for wrought
NOT Cast clasps
Now cast clasps can be used as well
Flexible
moves
in many
directions
1D
Notice the assistance of the opposing reciprocating arm
on upward displacement
Retention
Reciprocation
Palatal
Anterior
Posterior
Mid palatal
Lingual bar
Lingual plate
Choice depends on many factors including
Tolerance
Periodontal condition
Patient wishes
Dentist preference
Indirect retainers
Full transcript