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Restorative > Bridgework 3 > Flashcards

Bridgework 3 Flashcards

1
Q

RR types of design

A

Cantilever
Fixed-fixed

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2
Q

Conventional types of designs

A

Cantilever
Fixed-fixed
Fixed-moveable

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3
Q

Types of pontic

A
  • Wash through
  • Dome
  • Ovate
  • Modified ridge lap
  • Ridge lap
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4
Q

Function of a pontic tooth

A

Restores appearance of missing tooth
Stabilise the occlusion
Improve masticatory function

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5
Q

List 3 main considerations for pontic design

A
  1. Cleansability
    - Smooth
    - Surface should not harbour join of metal and porcelain
    - Embrasure space smooth and cleanable
  2. Appearance
    - Anteriorly as tooth like as possible
  3. Strength
    - Longer the span, greater the thickness required to withstand occlusal forces
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6
Q

Features of a wash through pontic

A

Makes no contact with soft tissue
- Functional > appearance
- Consider in lower molars

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7
Q

Features of a dome-shaped pontic

A

Useful in lower incisor, premolar or upper molar areas
Acceptable if occlusal 2/3 of buccal surface visible

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8
Q

Features of a modified ridge lap pontic

A
  • Buccal surface as much like tooth as possible
  • Lingual surface cut away
  • Prob less with food packing on lingual surface of ridge
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9
Q

Features of a ridge lap/saddle pontic

A
  • Greatest contact with soft tissue
  • Less food packing than ridge lap
  • Can cause blanching of soft tissue
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10
Q

Materials for conventional bridges

A
  • All metal
    (gold, nickel/cocr, SS)
  • Metal ceramic
  • All ceramic
    (cement with Zirconia, lithium disilicate)
  • Ceromeric
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11
Q

Clinical steps to conventional BW

A
  1. Mounted study models + consider diagnostic wax up
  2. Request lab to construct vacuum formed stent
    (Allows checking of reduction during tooth prep + provisional bridge)
  3. Select shade
  4. Occlusal or incisal reduction
  5. Separation of teeth
  6. Aim for parallelism of tapered surface of each prep
  7. Construct provisional bridge + cement
  8. Write prescription
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12
Q

What does parallelism mean?

A

Single path of I
No undercuts

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13
Q

What must be included in a BW prescription?

A

Abutment teeth
Pontic + shape
Materials

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14
Q

Materials to cement metal conventional/ MC bridgework

A

GI luting cement (Aquacem)
RMGI luting cement (Relyx)

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15
Q

Materials to cement RRB (all types)

A

Anaerobic duel cure resin cement with 10-MDP (Panavia)

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16
Q

Material to cement all ceramic bridge

A

Dual cure resin cement (NEXUS)

17
Q

Why do you avoid distal cantilevers?

A

Concern if occlusal forces on pontic will tilt abutment tooth

18
Q

When may you consider a distal cantilever?

A

Premolar abutment if unopposed or opposed by a denture

Restorative (8 decks)

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