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3rd yr- CSB- tooth loss symposium > Bridges > Flashcards

Bridges Flashcards

1
Q

What is a bridge

A

A bridge is a fixed prosthesis used to replace one or more teeth, which cannot be removed by the patient

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2
Q

What is an abutment tooth

A

Tooth to which the bridge is attached

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3
Q

How are abutment teeth usually prepared for a bridge

A

They are usually prepared for a crown

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4
Q

What is a pontic

A

The artificial tooth that is carried by the prosthesis to replace the missing natural tooth/teeth

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5
Q

What is a saddle

A

An area of edentulous ridge over which the pontic will sit

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6
Q

What are bridge retainers

A

A restoration that is cemented onto the abutment tooth

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7
Q

What are bridge retainers usually

A

PFM
Full veneer crown
3/4 crown

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8
Q

What is a connector

A

The area of the bridge that joins the pontic to the retainer

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9
Q

What is a unit

A

A term used to indicate the number of pontics or retainers associated with the bridge

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10
Q

What does the anti indicate

A

Indicates the length of the bridge

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11
Q

What does the unit number include

A

The number of retainers and pontics that make up the bridge

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12
Q

Name the 2 main types of bridge work

A
  1. Resin bonded bridgework

2. Conventional bridge work

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13
Q

Describe resin bonded bridgeworks

A

When we have metal wings that is bonded onto the abutment tooth/teeth in order to retain the pontic

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14
Q

Describe conventional bridge

A

When abutment teeth are crowned and the pontic Is between the crowns

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15
Q

How is conventional bridge retained

A

Retained on the bridge abutment with a conventional retainer eg full coverage crown

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16
Q

List the indications for conventional bridgework

A
  1. Well motivated patient
  2. Excellent plaque control
  3. No active carious lesions
  4. Stable periodontium
  5. Small edentulous spaces
  6. Heavily restored abutment
  7. Replacement bridge work
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17
Q

Name the 2 main designs conventional bridges can have

A
  1. Fixed-fixed bridges

2. Cantilever bridges

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18
Q

Describe a fixed fixed design

A
  1. Retainer at either side
  2. Pontic lies between the retainers
  3. Rigid connector joins Pontic to the retainers
  4. 4 units or LESS
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19
Q

Give some advantages of fixed fixed bridges

A
  1. Robust design for maximum strength and maximum retention
  2. Most practical design for larger spans
  3. Splinting of abutment teeth may be advantageous in a patient with stable periodontal disease
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20
Q

Give some disadvantages of fixed fixed bridges

A
  1. Preparations need to be parallel which can be difficult to achieve
  2. Both preparation are destructive
  3. Cementation problems as bridges must be inserted in one place
  4. Design is not suitable for abutment teeth that are markedly tilted
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21
Q

How is the abutment tooth prepared for a fixed fixed bridge

A

The abutment needs full occlusal coverage to prevent occlusal contacts depression the natural tooth contacts

22
Q

What can happen if the abutment teeth depress natural tooth contacts

A

The bridge can debond with leakage and caries

23
Q

Describe a cantilever bridge design

A
  1. Retainers only at one end
  2. Only ONE pontic with a rigid connector
  3. 2 or more units
  4. Uses abutment teeth with large root surfaces
24
Q

Which tooth would be the best abutment to use to replace a 5?

A

The 6s

25
Q

Which tooth would be the best abutment to use to replace a 2?

A

The 3s

26
Q

Which tooth would be the best abutment to use to replace a 1s?

A

The other 1

27
Q

Give some advantages of a cantilever bridge?

A
  1. You only need to prepare one abutment tooth so more conservative than fixed fixed
  2. No paralleling or multiple abutments with 2 unit design
28
Q

What are the disadvantages of a cantilever bridge design

A
  1. Leverage forces on beh abutment tooth limits the span of the bridge to only 1 pontic
  2. Torquing forces from the occlusion must not act on the pontic
29
Q

List some materials that were can use in bridge construction

A
  1. Metal ceramic (old)
  2. Silica ceramic
  3. Zarconia ceramic
  4. Alumina ceramic
  5. All ceramic
30
Q

What is the survival rate of a fixed fixed conventional bridge at 10 years

A

87%

31
Q

What is the survival rate of a cantilever conventional bridge at 10 years

A

80%

32
Q

How many bridge abutments lose vitality

A

10-30%

33
Q

How many bridge abutments fracture over 10 years

A

2%

34
Q

How many bridge frameworks/ veneering porcelain fracture over 10 years

A

3%

35
Q

Which framework is more problematic: veneering porcelain or metal ceramic

A

Veneering porcelain fractures more than metal ceramic

36
Q

How can conventional bridges fail?

A
  1. Abutments can lose vitality

2. Abutments can fracture and retainers can de cement

37
Q

List the indications for adhesive bridgework

A
  1. Good oral hygiene/ stable periodontium and no caries
  2. Unrestored/ minimally restored teeth
  3. Good quality and quantity of enamel to bond to
  4. Short edentulous space
  5. Could be used as an interim for implant therapy restorations
38
Q

Give some contra indications for adhesive bridge work

A
  1. Poor Oral hygiene/ uncontrolled periodontitis and caries
  2. Poor quality and quantity of enamel to bond to
  3. Heavily restored teeth
  4. Parafuncitonal habits
  5. Bruxists
  6. Short clinical crown height
39
Q

How do we prepare teeth for resin bonded bridges

A

No preparation or VERY minimal preparation of the abutment teeth

40
Q

What should we limit when preparing abutment teeth for a resin bonded bridge

A

Limit any preparation to guide planes/removing obstructive undercuts and ensure this is limited to enamel

41
Q

What do we use to resin the bridge on the abutment teeth

A

Wing retainers

42
Q

Describe the wing retainers we use for bridgework

A

We use rigid non precious wing retainers of at least 0.7-0.8mm thickness

43
Q

What must we make sure we keep the poetics out of

A

Excursive contacts

44
Q

If we were to do a bridge in the posterior portion of the mouth which bridge design would we avoid

A

Avoid fixed fixed adhesive bridges (we prefer cantilever bridges)

45
Q

How can we improve aesthetics in a patient who may have alveolar bone damage

A

Use pink pontic to try aim replace the lost alveolar tissue

46
Q

List the different pontic designs

A
  1. Ridge lap pontic
  2. Modified ridge lap pontic
  3. Ovate pontic
47
Q

Which of the pontic designs is the most aesthetic

A

Ovate pontic

48
Q

What are the problems associated with an ovate pontic

A

Had to achieve good oral hygiene

49
Q

Which cement do we use to cement bridges

A
  1. Panavia F 2.0 (Rely x)

2. Panavia 21

50
Q

What should we do to the metal wing retainer before cementing

A

Sandblast them

3rd yr- CSB- tooth loss symposium (3 decks)

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