Flashcards
Removable Partial Dentures
Flashcards do conjunto (29)
- 1What are the advantages of RPDs?Simple
Restore Function
Restore Aesthetics
Cost effective - 2What are the disadvantages of RPDs?Plaque Retentive
Aesthetics
Denture Stomatitis
(possible) Gum Stripping - 3What are the clinical stages of an RPD?1. Exam and Primary Impressions
2. Master Impressions
3. Jaw Registration
4. Tooth Trial
5. Co/Cr Trial
6. Co/Cr Wax Trial
7. Delivery
8. Review - 4Why are teeth lost?Caries
Periodontal disease
Trauma
Periapical disease
Orthodontics
Impaction - 5What are the consequences of losing teeth?Bone resorption
Loss of ST support
TMJ problems
Drifting/Tilting
Aestehtics
Function -> speech,mastication
Pyschological impact - 6Draw and label Posselt's Envelope
- 7What is Craddock's Classification?Classifies Support
I. Tooth borne
II. Mucosa borne
III. Tooth and mucosa borne
IV. Implant
V. Implant and mucosa - 8What is Kennedy's classification?Classifies saddle areas
I. Bilat.Free End Saddle
II. Unilat.Free End Saddle
III. Unilat.Bounded Saddle
IV. Ant.Bounded Saddle
Mods -> Always defined by POST saddle ∴ Class IV cannot have mods. - 9Name the components of an RPDSaddles
Rests - occ, cing, incisal
Clasps - occ/ging. approach
Bracing and reciprocation
Connectors - minor/major - 10What are the Adv/Disadv of mucosa borne dentures?Adv - cheap, easy to make and adjust
Disadv - poor support/retention, can damage tissues - 11What are the Adv/Disadv of tooth borne denturesAdv - Good support, stability and retention
Disadv - cost, complexity, difficult to add to, may require tooth preparation - 12What is the design process for an RPD?1. Outline saddles
2. Decide support
3. Retention - direct and indirect
4. Bracing/reciprocation
5. Connectors - 13Define support- Resistance to occlusally directed forces
-Transmission of load via the periodontal membrane or mucosa
- Craddock's Classification - 14What are the functions of rest seats? Name some types Define position and size principlesFunction - main -> Support
other -> direct/indirect retention, prevent overeruption, recipcrocation
Types -> occlusal, cingulum, incisal, onlay
Position -> adjacent to saddle area OR mesial to free end saddle
>3mm from ging.margins if acrylic
Size -> large as possible >0.5mm and 1mm @ connectors - 15Define Retention- Resistance to vertical dislodging
- 3 types -> Mechanical (best)
Muscular
Physical via adhesion/cohesion - 16What is mechanical retention?Clasps -> engage undercuts
Close to saddle area as possible
Always have rest on same tooth
Occ.Approach e.g. Ring/Circumferential
Ging.Approach e.g. I-Bar - 17What is the minimum length for a co/cr clasp?15mm
- 18What size undercut is required for: co/cr? Gold? Stainless Steel?Co/cr - 0.25mm
Gold - 0.5mm
Stainless Steel - 0.75mm - 19Other than clasps, how else can retention be achieved?Guide Planes
Change POI to different from POD - 20What is pattern of retention? What is acceptable?Areas of denture with retentive features
May be square, triangle or straight lined (diagonal) - 21Define Indirect Retention1. Resistance to rotational displacement forces
2. e.g. a rest preventing distovertical rotational displacement
3. If this rest moves closer to the axis of rotation then the fulcrum moves forward
4. Resists BL and distohorizontal forces e.g. major connector
5. Primarily used in free end saddles - 22What is an RPI?- Stress relieving clasp system
- Allows vertical rotation of D saddle w.out unwanted movement of the last standing abutment tooth
- P & I disengage during function to allow this
Made up of: R - Rest (Mesially on tooth)
P - Proximal Plate - adjacent to saddle w/guide surface
I - I-bar - 23What is the function of a connector? What are the 2 main types?Stability
Major
Minor - 24Name some max.major connectorsPlate/Strap -> mucosa borne (~0.5mm thick)
Bar -> tooth borne (~2mm thick)
Ring/Horseshoe
All described by ANT/MID/POST - 25Name some mand.major connectorsLingual Bar - >8mm depth, 4x2mm
Sublingual Bar - more depth needed
Lingual Plate - rests on teeth & indirect retention
Dental Bar/Labial Bar - rarely used - 26Describe minor connector usesTransfer stress to/from abutment teeth
Finish above the survey line
Cover as little gingiva as possible
Should cross ging.margin @ right angle for cleaning ease - 27How is a cast surveyed?1 - secure cast to table and tripod horizontally at common POD
2 - Use analysing rod to find undercuts
3 - Use graphite marker on abutments and related ST to mark undercuts
4 - Change POI as needed - 28Name 4 types of articulatorSimple Hinge
Average Value
Semi-Adjustable
Fully Adjustable - 29What are the average angulations on an articulator for mounting casts?0° - incisal post
10° - incisal table
20° - pillars
40° - condyle
Informações
- Descrição
- FlashCards sobre Removable Partial Dentures, criado por Michael Brown em 13-11-2015.
- Criado por
- Michael Brown · nov 2015
- Atualizado
- 19 fev 2016
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