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OSCE CRAM > Bridgework > Flashcards

Bridgework Flashcards

1
Q

What is an abutment

A

Prepped tooth

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2
Q

Contraindications for bridges

A

Poor OH
Periodontal disease
Large pulps (conventional)
High possibility of further tooth loss
Large span
Abutment prognosis poor
Tilted teeth

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3
Q

What is a Pontic

A

Tooth being replaced

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4
Q

What is a retainer

A

Crown over prepped tooth

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5
Q

Common design for anteriors

A

Cantilever

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6
Q

Common design for posteriors

A

Fixed-fixed

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7
Q

Retainer material for a cantilever bridge

A

CoCr or Nickel Chromium alloy

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8
Q

RRB disadvantages

A

Can debond
Chipping porcelain
Secondary caries
Metal shine through

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8
Q

RRB advantages

A

Less surgery time
Minimal/no prep
No LA required
If fails = less destructive
Cheaper

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9
Q

RRB indications

A

Young teeth
Good enamel quality
Large abutment tooth
Minimal occlusal load

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10
Q

RRB contraindications

A

Poor enamel quality
Long spans
Bruxists
Tilted/poorly aligned teeth

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11
Q

Direct RRB pontic options

A

Ideally pts own tooth - remove pulpal tissue
Acrylic denture tooth
Polycarbonate crown
Cellulose matrix with composite

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12
Q

RRB prep

A

180 degree wrap-around
Rest seats (cingulum/posterior)
Notch on cingulum to help locate
Supragingival chamfer 0.5mm

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13
Q

Anterior prep if required

A

Minimal
Cingulum undercut removal
0.5mm supragingival chamfer
Notch on cingulum

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14
Q

Posterior prep if required

A

Occlusal rest
180 wrap around
0.5mm supra gingival chamfer

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15
Q

Temporisation for RRB

A

Not required
DBA if prep into dentine

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16
Q

Function of sandblasting retainer

A

Micromechanical retention
Al Oxide 50 microns

17
Q

Steps of use for PANAVIA - opaque

A

Etch lingual 30s wash + dry
Re-etch 60s wash + dry
A+B primer for 3-5s for 60s
Evaporate with gentle streams of air
One full turn of PANAVIA until click mix 20s
Place onto metal wing + pressure for 60s
Remove excess at margins
OXYGUARD at margins for 3m then wash off
Pumice + wash

18
Q

Checks after cementing RRB

A

Check occlusion + floss contact
Demonstrate OHI w superfloss/ID brushes

19
Q

Lab card for RRB

A

Please construct RRB cantilever bridge replacing 14, using 13 as a retainer.
Shade A3
Modified ridge lap pontic
0.7mm metal wing

20
Q

Conventional bridge design options

A

Fixed fixed
Fixed cantilever
Fixed moveable
Hybrid bridge
Spring cantilever bridge

21
Q

Fixed-fixed conventional adv

A

Can be used for longer span
Max retention + strength
Robust, withstand force

22
Q

Fixed-fixed conventional disadvantages

A

Common path of I
Prep must be 5-7 degrees tapered
Prep difficult (parallel required)

23
Q

Advantages of fixed moveable bridge

A

Solution for parallelism/diff path of I

24
Q

Disadvantage of fixed moveable bridge

A

Only used for replacing 1 tooth

25
Q

Abutment requirements

A

Able to withstand forces
No PA/periodontal disease
Crown: root ratio optimum 2:3
Minimum 1:1

26
Q

Bridgework assessment

A

MH DH
BPE
Perio
Caries
Parafunction
TTP
Sensibility testing
Xrays
Occlusion + space
Incisor class
Canine/group function
Overeruption

27
Q

Pontic designs

A

Wash through
Dome
Modified ridge lap
Total ridge lap
Ovate

28
Q

Indications for wash through pontic

A

No contact with Sts
Function>appearance
Lower molars

29
Q

Indications for dome pontic

A

Lower incisors/premolars

30
Q

Indication for total ridge pontic

A

Greatest contact with ST
Less food packing

31
Q

Indication for modified ridge pontic

A

Aesthetics
Food packing lingually

32
Q

Conventional materials

A

All metal - gold, nickel, cocr, SS
MCC
All ceramic - Zirconia/lithium disilicate
Ceromeric - belle glass (porc+comp)

33
Q

Zirconia (LAVA) disadv

A

Block shade
Decreased aesthetics

34
Q

Lithium Disilicate (EMAX) adv

A

Aesthetics

35
Q

Conventional bridge prep

A

Pick shade
Occlusal/incisal reduction
Separation
Aim for parallelism
No undercuts
Construct provisional bridge
Take imps + regi

36
Q

Cement for All metal crown

A

Aquacem
Relyx luting cement

37
Q

Cement for MCC

A

Aquacem
Relyx luting cement

38
Q

Cement for RRB

A

Panavia 21 (anaerobic dual cure resin with 10MDP)

39
Q

Cement for all ceramic

A

NEXUS (dual cure resin)

40
Q

Why do we avoid distal pontics?

A

Occlusal forces on pontic will produce leverage forces on abutment, causing it to tilt

OSCE CRAM (40 decks)

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