RPD MCQs Flashcards
Which of the following are incorrect with respect to fixed prosthesis?
a) They replace teeth only
b) They are conservative
c) Long term prognosis is unpredictable
d) Single unit adhesive cantilever is the prosthesis of choice
B - they are not conservative
Identify treatment options for partially dentate pt arranged from best option to last resort. (6)
No tx Ortho space closure RPD Fixed prosthesis/ bridges Implants
List the disadvantages and advantages of an PRD (8)
Advantages:
-can be removed for cleaning
-non-invasive
-will replace missing teeth and supportive structures
-keeps tx options open
-can be modified for progressive tooth loss and bone resorption
-can restore long spans
Disadvantages
-plaque accumulation and candidosis in pts with poor OH –> perio, caries
-direct trauma from components
-poor distribution of occusal forces
-poor appearance of clasps
-difficulty in pt acceptance - 50% of free end saddles not worn
-intolerance of major components
-chronic atrophic candidosis
Occlusal rests can be used for
a. Distributing force down the long axis of the tooth.
b. Providing indirect retention.
c. Prevent overeruption of the teeth.
d. All of the above.
D - all of the above
Why would you choose an RPD over a bridge?
Does not need extensive tooth prep Can be adapted and added to over time Can be used for long span edentulous areas Can be easily replaced Removable so easier to clean Can be removed for sport Less technique sensitive Cheaper lab and material costs
When would you provide acrylic over CoCr denture to patient?
Following immediate tooth loss - where bone loss is occurring
When only few teeth remain or remaining teeth have poor prognosis for pt to get used to RPD before CD is provided
When jaw is still growing i.e. during youth or Paget’s disease
Diagnostic denture required
(advantages: low cost, ease of modification, can reline)
What are the 6 components needed for a good partial denture?
Support, retention, bracing, reciprocation, indirect retention, connector
What is the function of a clasp?
To engage undercut
What are the different attachments of an articulator and what is each used for?
Analysing rod to identify undercuts
Graphite marker to mark maximal bulbosity
Chisel to eliminate unwanted undercuts
Undercut gauge to allow undercuts to be measured to correctly place clasp tips
Why would you tilt a study cast when surveying and what must you do once the final tilt has been decided?
To utilise undercuts to change POI relative to POD to improve retention - e.g. anterior tilt to Kennedy class I and II cases Aesthetics e.g. posterior tilt to Kennedy class IV cases You must mark study cast either side with final tilt position so same tilt can be reproduced in lab
Define a guide plane and briefly explain how they can be used to aid stability of partial dentures
2 or more parallel axial surfaces and can occur naturally on teeth
Limit POI to single path making it more stable
Can be milled into crowns or cut into natural teeth
40yo pt come to you with loose temp RPD, knocked out upper centrals in cycling accident 3 months ago. Most probable reason for loss in retention
Alveolar bone resorption
5 ways to replace missing teeth
Orthodontic space closure Immediate RPD Co-Cr RPD Bridge Implant (always offer no tx)
Bracing, indirect retention, direct retention: description and component
Bracing: resistance to forces displacing denture laterally and anteriorly
-occurs when denture is fully seated and resists vertical movement
-component is reciprocating arm of clasp, plate, connector
Indirect retention: acts as fulcrum when displacing forces applied to denture, preventing rotation of clasp
-occlusal rest
Direct retention: resistance to displacing forces acting o partial dentures
-provided by physical forces, muscular control and clasps
Pt likes the look of teeth, what 3 things could you do to keep aesthetics the same
Shape (impression)
Colour and translucency (shade)
Surface texture and characterisation (photos)
