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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
Which tooth would be the best abutment to use to replace a 5
The 6s
26
What tooth would be the best abutment to use to replace the 2
The 3s
27
Which tooth would be the best abutment to use to replace a 1
The other 1
28
Give some advantages of a cantilever bridge
1. You only need to prepare one abutment Tooth 2. No paralleling or multiple abutments with 2 unit design
29
What are the disadvantages of a cantilever bridge design
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
List some materials that we can use in bridge construction
1. Metal ceramic (old) 2. Silica ceramic 3. Zarconia ceramic 4. Alumina ceramic 5. All ceramic
31
What is the survival rate of a fixed fixed conventional bridge at 10 years
87%
32
What is the survival rate of a cantilever conventional bridge at 10 years
80%
33
What percentage of abutments lose vitality
10-30%
34
How many abutments fracture over 10 years
2%
35
How can conventional bridges fail
1. Abutments can lose vitality 2. Abutments can fracture and retainers can de cement
36
List the indications for adhesive bridge work
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
Give some contra indication for adhesive bridge work
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
How do we prepare teeth for RBBs
No prep or very minimal prep of the abutment teeth
39
What should we limit when preparing abutment teeth for RBBs
Limit any prep to guide planes removing obstructive undercuts and ensure this is limited to enamel
40
What do we use to retain bridges on the abutment teeth
Wing retainers
41
Describe the wing retainers we use for bridgework
We use rigid non precious wing retainers of at least 0.7-0.8mm thickness
42
What must we make sure the we keep the Pontic out of
Excursive contacts
43
List the different Pontic designs
1. Ridge lap Pontic 2. Modified ridge lap Pontic 3. Ovate Pontic
44
Which of the Pontic designs is the most aesthetic
Ovate Pontic
45
What are the problems associated with an ovate Pontic
Hard to achieve good oral hygiene
46
Which cements can we use to cement bridges
1. Panavia F 2.0 (Rely X) 2. Panavia 21
47
What should we do to the metal wing retainer before cementing
Sandblast them
48
Name the 3 components of a fixed bridge
1. Abutment 2. Pontic 3. Retainer
49
What is an abutment
The part of a structure that directly received the pressure can be natural tooth or dental implant
50
What is a Pontic
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
What is a retainer
The part of the bridge which is cemented to the abutments
52
What form can a retainer take
1. Crown 2. 3/4 crown 3. Metal wing 4. Inlay/ Onlay
53
Name the different abutments
1. Signal abutments 2. Double abutments
54
Name the different types of Pontic design
1. Modified ridge lap 2. Ovate 3. Sanitary 4. Ridge lap
55
Which Pontic design is most common
Modified ridge lap
56
What is a ridge lap Pontic
When the Pontic is directly contacting the ridge both bucally and lingually
57
What is a modified ridge lap Pontic
When the Pontic is only in direct contact with the ridge bucally
58
What is a sanitary Pontic
When there is no contact between the ridge and the Pontic
59
What Is an ovate Pontic
When there is point of contact between the pontic and the ridge
60
What is the main purpose of having different Pontic designs
To make the bridge more hygienic
61
Why is the modified ridge lap Pontic the most common
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
Which of the Pontic designs is the most hygienic
The sanitary Pontic as there is space under the Pontic for cleaning but this is the least aesthetic
63
Which of the pontic designs is the most aesthetic?
The ovate Pontic but you have to perform soft tissue srugery to prepare the site so is only palced where aesthetics are important
64
What is the main complication surrounding resin retained cantilever bridges
Debonding
65
What are the main complications surrounding conventional cantilevers
1. Caries risk 2. Endo risk 3. Loss of retention
66
Why might a crown or bridge fail
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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