RPD Flashcards
What is Kennedy Class I?
Bilateral free end saddles
What is Kennedy Class II?
Unilateral free end saddles
What is Kennedy Class III?
Unilateral bounded saddle
What is Kennedy Class IV
Anterior bounded saddle that crosses the midline
What is meant by support?
Resistance of a denture to occlusally directed loads
What components are used to provide support for dentures against vertical loads?
Rest seats
What is meant by retention?
Used to describe the resistance of a denture to lifting away from the tissues (vertical dislodging forces)
What components achieve retention in a denture?
Clasps
What is direct retention?
Resistance to vertical displacement of denture
What is indirect retention?
Resistance to rotational displacement of denture
What components are used in an RPI?
Mesial rest
Proximal guide plane
Gingivally approaching I-bar clasp
When is an RPI used?
Used in free end saddle designs to prevent stress on the last abutment tooth- predominantly mandibular arches
What is stability?
Resistance of a denture to displacement (by functional forces) in a horizontal direction
What is adhesion?
The physical attraction of unlike modules for each other
Saliva and mucous membrane
Saliva and denture base
What is cohesion?
The physical attraction between similar molecules
Why do Dentures fractures?
Impact
Acrylic in thin sections
Work hardening of metal
Parafunctional habits
Occlusion
Soft linings
Bonding between tooth & base acrylic
How do you fix a midline fracture of complete dentures?
If fractures pieces can be located together, disinfect and send to the lab
-No impression needed
How do you repair a denture if part of the acrylic flange is lost?
Impression taken with fractured denture in mouth, disinfected, case poured and new acrylic processed into defect
When are strengtheners used in dentures?
In patients that repeatedly break dentures or patients with parafunctional habits
What is ICP?
Intercuspal position
The complete intercuspation of the opposing teeth independent of condylar position
What is RCP?
Retruded contact position
Guided occlusal relationship occurring at the most retruded position of the condyles in the joint cavities
Reproducible position
What are index teeth?
Contacting facets of teeth in the intercuspal position
Need to have enough meeting to achieve a stable occlusion
What is the most commonly used articulator?
Average value (fixed condylar articulator)
Condylar guidance track is fixed at an average value
Why reline dentures?
Fitting surface is inadequate but otherwise the denture is okay
Why rebase a denture?
When you want to keep the occlusal surface but change the fitting and polished surface
What is the method for relining a denture?
Remove undercuts from dentures fitting surface using acrylic bur
If underextended can add greenstick where needed
Functional impression- Light bodied silicone in denture fitting surface and get pt to bite down as take the impression
What to write on denture lab card for reline?
Please pour up impression in 100% dental stone using reline impression with denture provided. Please mount upper to cast and create a self cure PMMA reline to change the impression surface.
What is the first stage of replica dentures?
Place putty in denture tray
Sit denture in putty
Ensure that the phalanges are level with the material
Cut notches in the top to differentiate the two halves
Cover putty with vaseline
Place putty over fitting surface
What is the second stage of replica dentures?
Take functional impression with light bodied silicone on the fitting surface whilst taking bite registration
Check occlusion and FWS
What are the local measures to treat denture induced stomatitis?
Brush the palate daily
Clean dentures thoroughly and give denture hygiene instruction
Leave their dentures out as often as possible
New dentures once problem has resolved
What is the treatment for denture induced stomatitis?
Miconazole- send 80g tube, apply pea-sized amount to fitting surface of upper denture after food 4x daily
Fluconazole 50mg tablets 7 capsules 1x daily
Nystatin- oral suspension send 30ml, 1ml after food 4xdaily for 7 days. Pt has to rinse and then hold suspension in mouth for 5 mins before swallowing.
What is denture induced stomatiits?
Inflammatory condition caused by overgrowth of candida in the mouth
What can cause denture stomatitis?
Poor oral hygiene
Ill-fitting dentures
Lack of regular cleaning
