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5th BDS - ACS > Adhesive Bridge I > Flashcards

Adhesive Bridge I Flashcards

1
Q

Adv of adhesive bridges?

A

Seen conservative option replace teeth
Less destructive than conservative bridges
Viable for sound/ lightly restored dentition

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2
Q

What is Rochette bridge?

A

No true adhesive bridge - perforation in wings allowing cement extrude = mechanical retention

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3
Q

Types of retention of bridges?

A

Full coverage

Adhesive retainers

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4
Q

How are full coverage bridge provided?

A

Prep of abutment tooth for full coverage crown

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5
Q

How are adhesive bridges provided?

A

Minimal prep of abutment tooth involving only palatal and proximal surface

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6
Q

What are different types of abutment arrangements?

A

Fixed-fixed

Cantilevered

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7
Q

What is a fixed-fixed bridge?

A

Bridge has two abutment with pontic between

Pontic fixed either side

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8
Q

What is a cantilever bridge?

A

Bridge retained by one abutment

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9
Q

Tx options for missing teeth?

A

Do nothing
Removable - RPD
Fixed - bridge
Implant

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10
Q

10 parts of design criteria for adhesive bridge?

A
  1. Periodontal support
  2. Occlusal loading
  3. Conservation tooth tissue
  4. Cleansible
  5. Appearance
  6. Rigidity
  7. Quality of abutment tooth
  8. No of abutments
  9. Choice cement
  10. Contingency planning
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11
Q

What assess when assessing the quality of the abutment tooth?

A

Vitality of tooth
Restoration status of tooth
Any rotations
Oral hygiene

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12
Q

Main reason need to contingency plan?

A

Loss of vitality of abutment tooth

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13
Q

Ideal design of adhesive bridge?

A

Used for single tooth replacement

Cantilevered

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14
Q

Adv of cantilever bridges?

A

Pontic moves with abutment - reduces shear forces

Reduced caries risk

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15
Q

How prep tooth for cantilevered RBB?

A

Mesial and distal grooves
Light palatal chamfer
Cingulum rest

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16
Q

How thick does retainer need to be on a mnolar?

A

0.8mm thick - increased thickness if over occlusal surface

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17
Q

Why need correct thickness for retainer?

A

Rigidity - prevent flexion = peeling effect = debond

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18
Q

Ideal bonding area?

A

Maximise enamel bonding

Occluso-gingival and circumferential around tooth

19
Q

Issue w/ increasing bonding area of framework?

A

Aesthetic and perio implication

Maximise SA w/o encroach gingival tissue and aestehtic zone

20
Q

Two approachs to tooth prep and extension frameowrk?

A
  1. Full palatal coverage w/ no prep

2. Reduced palatal coverage w/ tooth prep

21
Q

Why provide occlusal coverage on posterior teeth?

A

Resist displacement
Increase rigidity
Greater SA bonding

22
Q

What is the connector?

A

Junction between pontic and retainer

23
Q

Why need sufficient thickness of connector?

A

Prevent flexion = peeling = debond

24
Q

Is height of connector important?

A

Yes needs to be at least 50% height of pontic

25
Q

Why are grooves used in adhesive bridge prep?

A

Resistance lateral displacement

Increased retention

26
Q

What want grooves on tooth to be?

A

Parallel - increase resistance and retention

27
Q

Why are occlusal seat rests used?

A

Allow transmission of occlusal force along long axis of tooth

28
Q

What is joining the occlusal rests called?

A

Occlusal bar

29
Q

Advantage of preparing an occlusal bar?

A

Improve rigidity of retainer

30
Q

What cements can be used for adhesive bridges?

A

Self cure composite lute
Anaerobic adhesive lutes
4-meta ahdesive lutes

31
Q

Example of self-cure compoiste lute?

A

Calibra

32
Q

What need with self-cure composite lute?

A

Non-adhesive
Needs used in combination w/ bonding system
Require etched metal substrate

33
Q

Example of anaerobic adhesive lute?

A

Panavia

34
Q

What need to use with Panavia?

A

Oxygaurd - ensure bonding takes place anaerobically

35
Q

When a 4-meta adhesive lutes used?

A

Want speicifc bonding to metal and ceramic retainers

36
Q

What materials are used for retainer?

A

Nickle chromium
Gold alloy
Ceramics

37
Q

How choose abutment tooth?

A

Tooth position - angulation agreeable POI?
Crown shape - increased SA
Restorative status
Endodontic status

38
Q

What teeth provide poor abutment teeth?

A

Maxillary lateral incisor - small w/ little SA to bond + small roots
Tilted teeth
RF teeth

39
Q

Estimated survival of RBB?

A

87.7% at 5 years

40
Q

Reason for failure RBB?

A

Debonding
Caries under retainer
Aesthetic failure

41
Q

What should not do when designing bridge?

A

Use of double abutment - not required and difficult to clean

42
Q

When could fixed-fixed adhesive bridge be used?

A

Mandibular incsiors

43
Q

Design consideration of adhesive bridge?

A 
Retainer thickness
Bonding area
Wrap-around
Occlusal extension 
Connector design 
Length of span

5th BDS - ACS (8 decks)

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