3 - Bridgework 3 Flashcards
1
Q
What information is required about the occlusion when planning for bridgework?
A
- face bow mounted study casts
- incisal classification
- canine guidance vs group function
- opposing teeth over erupted?
- any signs of parafunction
2
Q
What should be evaluated in potential abutments?
A
- angulation/rotation of abutment
- root configuration
- surface area for bonding (adhesive)
- risk of pulpal damage (conventional)
- quality of endodontics
3
Q
What are the different types of pontic?
A
- wash through
- dome
- modified ridge lap
- ridge lap
- ovate
4
Q
What is the function of a pontic?
A
- restore appearance
- stabilise occlusion
- improve masticatory function
5
Q
What are the considerations when choosing a pontic design?
A
- cleansability
- appearance
- strength
6
Q
Describe the ideal cleansability of a pontic.
A
- surface smooth (highly polished or glazed)
- surface should not have join of metal or porcelain as occlusal load can damage (also plaque trap)
- embrasure should be smooth and cleanable
7
Q
Describe the ideal appearance of a pontic.
A
- in the anterior pontic should look as tooth like as possible
- in the posterior this is sometimes compromised for function
8
Q
Describe the strength required of a pontic.
A
The longer the span of the pontic the thicker the material required to withstand occlusal forces
9
Q
Describe a wash through pontic.
A
- makes no contact with soft tissue
- functional rather than for appearance
- lower molar area
10
Q
Describe a dome pontic.
A
- acceptable when occlusal 2/3 of buccal surface is visible
- coronal 2/3 normal, narrowing to a point at soft tissues
- lower incisors, lower premolar, upper molar areas
11
Q
Describe a modified ridge lap pontic.
A
- buccal surface looks like tooth
- lingual surface cut away
- small contact with soft tissues at ridge
- can have problems with food packing
12
Q
Describe a ridge lap pontic.
A
- has greater contact with soft tissues
- still cleanable if designed correctly
- less food packing than modified ridge lap
- patient requires good OH
13
Q
Describe an ovate pontic.
A
- good for patients with excellent OH who require good aesthetic result
- presses into gingiva causing moulding around tooth going the appearance of a gingival margin
- requires Essix retainer with ovate pontic to pre-mould prior to definitive bridge
14
Q
What are the different types of materials used for conventional bridges?
A
- all metal
- metal ceramic
- all ceramic
- ceromeric (historical)
15
Q
What material is used in all ceramic bridges?
A
- zirconia (LAVA)
- lithium disilicate (E-max)
