Fixed Bridges

Question 1

How many occluding premolar units are required for an adequate oral function in a shortened dental arch?

Answer 1

4 occlusal units (preferably in a symmetrical position)

Question 2

What type of material are implants made from?

Answer 2

Alloplastic materials

Question 3

What are the benefits of a resin bonded bridge?

Answer 3

1. Minimal or no tooth preparation required
2. No LA
3. Reversible procedure

Question 4

What are the disadvantages of a Resin bonded bridge?

Answer 4

1. Aesthetics may be compromised by the shine through of metal retainers
2. Debonding can occur

Question 5

Compare the success rates between anterior maxilla and posterior resin bonded bridges

Answer 5

Anterior maxilla more sucessful than posterior

Question 6

Comment on the survival of adjacent teeth when removable dentures are used to treat an endentulous space

Answer 6

Significantly lower survival rate when compared to no treatment and fixed prosthesis

Question 7

Give some disadvantages of removable partial dentures

Answer 7

1. Fit, retention, support and stability of removable dentures often unsatisfactory
2. Increased plaque retention (high caries and poor perio)
3. Often not worn

Question 8

What would need to happen if a root canal was needed on an abutment tooth of a cemented fixed bridge?

Answer 8

A remake of the bridge as access prepartion weakens the underlying dentine and core

Question 9

What are the requirements for an acceptable abutment tooth for a bridge?

Answer 9

1. Teeth are structurally sound
2. Teeth are in good alignment and position
3. Previous restorations and endo treatment are satisfactor
4. Roots and Bone are functionally adequate

Question 10

What is an important feature a pontic has to have?

Answer 10

Passive tissue contact with a convex, smooth fit surface and aqequate space to facilitate cleaning

Question 11

What is the most commonly used pontic design?

Answer 11

Porcelain fused to metal modified ridge lap design