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5th yr- Finals- CSB revision > tooth loss symposium > Flashcards

tooth loss symposium Flashcards

1
Q

What is a bridge

A

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

Usually prepared for 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 with 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 is the 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 connector

A

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

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10
Q

What is a unit

A

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

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11
Q

What does the unit indicate

A

Indicates the length of the bridge

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12
Q

What does the unit number include

A

The number of retainers and pontics that make up the bridge

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13
Q

Name the 2 main types of bridge work

A
  1. Resin bonded bridges
  2. Conventional bridge work
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14
Q

Describe resin bonded bridgework

A

When we have metal wings that bond onto the abutment tooth/ teeth in order to retain the Pontic

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15
Q

Describe conventional bridge

A

When abutment teeth are crowned and the Pontic between the crowns

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16
Q

How is conventional bridge retained

A

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

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17
Q

List the indication 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. Heavy restored abutment
  7. Replacement bridge work
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18
Q

Name the 2 main designs conventional bridges ca n have

A
  1. Fixed fixed bridges
  2. Cantilever bridges
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19
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 retianers
  4. 4 units or less
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20
Q

Give some advantages of fixed fixed bridges

A
  1. Robust deign for maximum strength and retention
  2. Most practical design
  3. Splinting of abutment teeth may be advantageous in a patient with stable Periodontium
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21
Q

Give some disadvantages of a fixed fixed bridge

A
  1. Preparations need to be parallel which can be difficult to achieve
  2. Both preparations are destructive
  3. Cementation problems as bridges must be inserted in one place
  4. Design is not suitable for abutment teeth are are markedly tilted
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22
Q

How is the abutment tooth prepared for a fix fix bridge

A

Abutment need full occlusal coverage to prevent occlusal contacts depressing the natural tooth contacts

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23
Q

What can happen if the abutment teeth depress natural tooth contacts

A

The bridge can debond with leakage and caries

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24
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
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25
Q

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

A

The 6s

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26
Q

What tooth would be the best abutment to use to replace the 2

A

The 3s

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27
Q

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

A

The other 1

28
Q

Give some advantages of a cantilever bridge

A
  1. You only need to prepare one abutment Tooth
  2. No paralleling or multiple abutments with 2 unit design
29
Q

What are the disadvantages of a cantilever bridge design

A
  1. Leverage forces on the abutment tooth limits the spam of the bridge to 1 pontic
  2. Torquing forces from the occlusion must not act on the Pontic
30
Q

List some materials that we can use in bridge construction

A
  1. Metal ceramic (old)
  2. Silica ceramic
  3. Zarconia ceramic
  4. Alumina ceramic
  5. All ceramic
31
Q

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

A

87%

32
Q

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

A

80%

33
Q

What percentage of abutments lose vitality

A

10-30%

34
Q

How many abutments fracture over 10 years

A

2%

35
Q

How can conventional bridges fail

A
  1. Abutments can lose vitality
  2. Abutments can fracture and retainers can de cement
36
Q

List the indications for adhesive bridge work

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
37
Q

Give some contra indication for adhesive bridge work

A
  1. Poor oral hygiene/ uncontrolled Periodontitis and caries
  2. Poor quality and quantity to bend to
  3. Heavily restored teeth
  4. Parafunctional habits
  5. Bruxists
  6. Short clinical crown height
38
Q

How do we prepare teeth for RBBs

A

No prep or very minimal prep of the abutment teeth

39
Q

What should we limit when preparing abutment teeth for RBBs

A

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

40
Q

What do we use to retain bridges on the abutment teeth

A

Wing retainers

41
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

42
Q

What must we make sure the we keep the Pontic out of

A

Excursive contacts

43
Q

List the different Pontic designs

A
  1. Ridge lap Pontic
  2. Modified ridge lap Pontic
  3. Ovate Pontic
44
Q

Which of the Pontic designs is the most aesthetic

A

Ovate Pontic

45
Q

What are the problems associated with an ovate Pontic

A

Hard to achieve good oral hygiene

46
Q

Which cements can we use to cement bridges

A
  1. Panavia F 2.0 (Rely X)
  2. Panavia 21
47
Q

What should we do to the metal wing retainer before cementing

A

Sandblast them

48
Q

Name the 3 components of a fixed bridge

A
  1. Abutment
  2. Pontic
  3. Retainer
49
Q

What is an abutment

A

The part of a structure that directly received the pressure
can be natural tooth or dental implant

50
Q

What is a Pontic

A

An artificial tooth on a fixed dental prosthesis that replaced a missing natural tooth, restores its function and usually fills the space previously occupied by the clinical crown

51
Q

What is a retainer

A

The part of the bridge which is cemented to the abutments

52
Q

What form can a retainer take

A
  1. Crown
  2. 3/4 crown
  3. Metal wing
  4. Inlay/ Onlay
53
Q

Name the different abutments

A
  1. Signal abutments
  2. Double abutments
54
Q

Name the different types of Pontic design

A
  1. Modified ridge lap
  2. Ovate
  3. Sanitary
  4. Ridge lap
55
Q

Which Pontic design is most common

A

Modified ridge lap

56
Q

What is a ridge lap Pontic

A

When the Pontic is directly contacting the ridge both bucally and lingually

57
Q

What is a modified ridge lap Pontic

A

When the Pontic is only in direct contact with the ridge bucally

58
Q

What is a sanitary Pontic

A

When there is no contact between the ridge and the Pontic

59
Q

What Is an ovate Pontic

A

When there is point of contact between the pontic and the ridge

60
Q

What is the main purpose of having different Pontic designs

A

To make the bridge more hygienic

61
Q

Why is the modified ridge lap Pontic the most common

A

As it gives you the aesthetics where there is no gap bucally between the tooth and gingiva and it is also easy to clean

62
Q

Which of the Pontic designs is the most hygienic

A

The sanitary Pontic as there is space under the Pontic for cleaning
but this is the least aesthetic

63
Q

Which of the pontic designs is the most aesthetic?

A

The ovate Pontic
but you have to perform soft tissue srugery to prepare the site so is only palced where aesthetics are important

64
Q

What is the main complication surrounding resin retained cantilever bridges

A

Debonding

65
Q

What are the main complications surrounding conventional cantilevers

A
  1. Caries risk
  2. Endo risk
  3. Loss of retention
66
Q

Why might a crown or bridge fail

A
  1. Endodontics
  2. Endodontic and debond
  3. Debond of retainer
  4. Aesthetics
  5. Prosthetics
  6. Fracture of porcelain
  7. Root caries
  8. Pain
  9. Root fracture

5th yr- Finals- CSB revision (17 decks)

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