6. Removable Prosthetics Flashcards
What are the 5 components of history taking before construction of new dentures?
- Complaints
- Denture history
- Dental history
- Medical history
- Social history
What are 5 medical history points that can impact denture wearing?
Neuromuscular problems
Tremors
Strokes
Dementia
Dry mouth
What are the areas that should be assessed when assessing dentures?
Extra Oral - TMJ, asymmetry, facial fullness
Intra Oral - soft tissues, hard tissues, occlusion, aesthetics
What are the 6 clinical stages of partial denture construction?
- First impressions
- Occlusion
- Second impressions
- Try in
- Fit
- Review
What are the 6 steps of designing a partial denture?
- Note: teeth being replaced
- Chose: saddles
- Chose: connector
- Chose: support
- Chose: retention
- Select: materials
What is a denture saddle?
Part of denture that holds artificial teeth
What is a connector?
The component that connects saddles together
What is a denture support?
The area of a denture that resists vertical load via teeth or bone
What is denture retention?
Resistance of vertical movement away from tissues via clasps
What is a bounded saddle?
When there is teeth on either side of a saddle
What is a free end saddle?
When there is no teeth distal to a saddle
What are the two types of saddles?
Bounded
Free end
What are 5 examples of lower connectors?
Lingual plate
Dental bar (requires 9mm crown height to accommodate 5mm bar)
Lingual bar (requires 7mm lingual sulcus as bar is 3.5mm plus clearance)
Split lingual plate
Swing lock denture
What are the 3 upper connectors for PMMA dentures?
Full coverage
Spoon
T denture
What are the 5 connectors for CoCr dentures?
Full coverage
Anterior palatal bar
Horseshoe
Mid palatal bar
Posterior palatal bar
What are the 2 types of support for dentures?
Teeth
Mucoperiosteum
How is retention achieved in dentures?
Saliva and suction
Muscle activity
Clasps
List 3 clasp types?
Occlusal approaching
Gingival approching
Ring
When would you use an occlusal approaching clasp?
If diagonal survey line
When would you use a gingival approaching clasp?
If high or low survey line
What are 4 materials used for clasps?
CoCr
Stainless steel
Gold
Copolymer
CoCr Clasps can engage undercuts up to a depth of:
0.25mm
Stainless steel clasps can engage undercuts to a depth of:
0.5mm
Gold clasps can engage undercuts up to a depth of:
0.75mm
Copolymers can engage undercuts of:
Any depth
What is the equation for recording occlusion?
FWS = RVD - OVD
FWS means?
FWS should be?
Freeway space
2-4mm
RVD meaning:
Rest vertical dimension
OVD meaning:
Occlusal vertical dimension
What is an index tooth?
A tooth that is in occlusion reproducibly
How is occlusion recorded if there is SUFFICIENT index teeth?
In ICP using bite reg paste
How is occlusion recorded if INSUFFICIENT index teeth?
ICP if bite reproducible
RCP if not
How do you get a patient into RCP?
Tongue to back of palate and guide closed
What are the 2 ways you can make new full dentures?
Conventional technique - start from scratch
Replica technique - replicate previous denture
What are the 6 stages of conventional full denture construction?
- First imps
- 2nd Imps
- Occlusion
- Try in
- Fit
- Review
Recording Occlusion for F/F dentures:
1. What are the 7 steps to recording with the upper block?
2. What are the 2 steps to recording with the lower block?
- Check stability, extension and retention
Check lip support
Check incisal level
Check anterior plane with interpapillary line
Check posterior plane with ala tragus line
Check posterior border
Mark centre line - Ensure even contacts with upper block
Ensure correct OVD with sufficent FWS
What are the 5 clinical stages for replica full denture construction?
- First imps via replica technique outwith the mouth
- Second imps and occlusion
- Try in
- Fit
- Review
How do you record occlusion for replica dentures if:
1. No changes required?
2. Change required?
- Bite reg paste
- Add/remove wax
What is the aim and use of first impressions?
To record all anatomical landmarks to construct models to allow:
Tx planning
Special tray construction
Occlusion examination
Design of denture
What should 1st imps record?
Natural teeth and denture bearing area
What are the 3 checks following first impressions?
Are all edentulous areas included
Are sulci included?
Are all teeth included?
List 4 ways to improve 1st impressions:
Modify tray
Use more or less material
Border mould
Pre pack palate/tuberosity
What is the aim and use of second impressions?
Aim: to record the tissues of the denture bearing area, the teeth and the sulci in a special made tray
Used to: construct a cast which represents the fitting surface of the finished denture
When should 2nd imps be done?
After denture is designed and any tooth modifications are completed