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BDS4- restorative dentistry > Bridgework > Flashcards

Bridgework Flashcards

1
Q

What is a bridge

A

A prosthesis which replaces a missing tooth or teeth and is attached to one or more natural teeth

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2
Q

What are general indications for bridgework

A

Function and stability
Apperance
Speech
Psychological reasons
systemic disease

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3
Q

What are local indications for bridgework

A

Big teeth

Heavily restored teeth

Favorable abutment angulations

Favorable occlusion

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4
Q

Contraindications for bridgework

A

Uncooperative patient

Medical history contra-indications

Poor oral hygiene

High caries rate

Periodontal disease

Large pulps

High possibility of further tooth loss within arch

Prognosis of abutment poor

Length of span too great

Ridge form and tissue loss

Tilting and rotation of teeth

Degree of restoration

Periapical status and perio

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5
Q

What is meant by abutment

A

a tooth that serves as am attachement for a bridge

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6
Q

What is meant by pontic

A

Artificial tooth which is suspended from abutment tooth

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7
Q

What is meant by retainer in bridgework

A

The extracoronal or intracoronal restorations that are connected to the pontic and cemented to the prepared abutment teeth

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8
Q

What is meant by coonectors

A

Component which connects the pontic to the retainer

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9
Q

What is meant by Edentolous span

A

Space between teeth that is to be filled by a bridge or partial denture

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10
Q

What is meant by saddle

A

Area of the edentolous ridge over which the pontic lies

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11
Q

What is meant by pier

A

An abutment tooth which stands between and is supporting 2 pontics, with each pontic attached to a further abutment tooth

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12
Q

What is meant by unit

A

Either a retaineer or pontic

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13
Q

What is a fixed fixed bridge

A

A pontic with a retainer each end

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14
Q

What is a cantilever bridge

A

Bridge with a retainer at 1 side of the pontic

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15
Q

What is resin bonded bridgework (RBB) also known as

A

Adhesive bridgework
Min. prep. bridgework
Maryland bridge

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16
Q

What are the adv of RBB

A

Minimal or no preparation

No anaesthetic needed

Less costly

Less surgery time

Can be used as a provisional restoration

If fails - usually less destructive than alternatives

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17
Q

What are the dis-Adv of RBB

A

Rigorous clinical technique

Metal shine-through

Chipping pocelain

Can debond

High chance of it debonding again

Occlusal interferences
No trial period possible

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18
Q

What are the indications for RBB

A

Young teeth (Less destructive)

Good enamel quality

Large abutment tooth surface area

Minimal occlusal load

Good for single tooth replacement

Simplify partial denture design

19
Q

When would you not use RBB

A

Insufficent/poor quality enamel

long spans

Excess soft or hard tissue loss

Heavy occlusal force (bruxism)

Poorly aligned, tilted or spaced teeth

20
Q

When planning bridges what would you mount it on

A

semi adjustable articulator

21
Q

Whats important to check for Tx planning bridges

A

Dynamic occlusal relationships
-clinically
-mounted study models
-Consider wax ups

22
Q

What are the 2 forms of RBB

A

Direct and Indirect

23
Q

When are direct RBB best for

A

emergency situations

24
Q

Whats happens in direct RBB

A

make a pontic
-Ideally patients own tooth
-Polycarbonate crown
- Cellulose matrix filled with composite

25
Q

What is needed for indirect RBB

A

Generous palatal/lingual coverage

good quality enamel

keep supra gingival, 0.5mm

26
Q

What is the best design for Ant. bridges

A

Cantilever

27
Q

What is the best design for post. bridges

A

Fixed Fixed

28
Q

Why cantilever bridges ant.

A

Divergent guidance paths

29
Q

If required what is the prep for RBB

A

180 ‘wrap around’ prep

Rest seats

supra gingival chamfer finish line 0.5mm

remain in enamel

30
Q

What does sandblasting do

A

micro-mechanical retention
50microns

31
Q

When Tx planning a bridge what is the occlusal info you want

A

Incisal classification

Canine-guided or group function

Opposing tooth over-erupted

Will bridge interfere with current occlusion

Signs of parafunction present

32
Q

What do you evaluate of potential abutments

A

Root configuration

Angulation/rotation of abutment

Periodontal health

Surface area for bonding & quality of enamel

Risk of pulpal damage

Quality of endodontics:
Re-root canal treatment

Remaining tooth structure present

33
Q

What are the considerations in pontic design

A

Cleanseability

Apperance

Strength

34
Q

What are the different pontic designs

A
  1. wash through
  2. dome
  3. modified ridge lap
  4. Ridge lap
  5. Ovate
35
Q

What is the wash through pontic design

A

Makes no contact with soft tissue

Functional rather than for appearance

Consider in lower molar area

36
Q

What is the dome shaped pontic design

A

Useful in lower incisor, premolar or upper molar areas

Acceptable if occlusal 2/3 of buccal surface visible

37
Q

What is modified ridge lap pontic design

A

Buccal surface looks as much like tooth as possible

Lingual surface cut away
Line contact with buccal of ridge

Problems with food packing on lingual surface of ridge

38
Q

What is ridge lap pontic design

A

Greatest contact with soft tissue

If designed carefully: can be cleansed

Less food packing than ridge-lap

Care taken not to displace soft tissue or cause blanching of tissue

39
Q

What materials are used for conventional bridges

A

All metal

Metal ceramic

All ceramic

Ceromeric

40
Q

When would gold be used

A

Lower post. area

41
Q

What should you try to avoid and why

A

distal cantilevers

Concern that occlusal forces on pontic will produce leverage forces on abutment tooth causing it to tilt

42
Q

What cement is used for all metal conventional bridgework and metal ceramic

A

Aquacem (GI luting cement)

RelyX luting (RMGI luting cement)

43
Q

What cement is used for Adhesive bridge

A

panavia 21 (anerobic duel cure resin cement)

44
Q

What cement is used for a all ceramic bridge

A

NEXUS (duel cure resin cement)

BDS4- restorative dentistry (8 decks)

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