9 - Tooth wear 2 Flashcards
Indirect restorations
1
Q
What are the principles used in treatment planning indirect restorations in tooth wear cases?
A
- consider adhesive minimally invasive first
- fixed restorations are possible if 50% tooth structure remains above gingival margin
2
Q
What problems present in tooth wear cases with tooth preparation?
A
- lack of occluso-gingival height
- lack of occlusal space
- severely compromised teeth
3
Q
What modifications can be incorporated in tooth wear cases to improve retention and resistance form?
A
- materials
- grooves
- inlays
- ferrule
- parallel preparations
- margins and occluding surfaces
- cores
- electrosurgery
- surgical crown lengthening
4
Q
How can materials be modified in tooth wear cases?
A
- metal on biting surfaces
- porcelain still used in smile line where possible
5
Q
Why is metal used in tooth wear cases?
A
More ductile and therefore less likely to fracture under high occlusal force
6
Q
How do inlays and grooves improve resistance?
A
Reduction in radius of rotation of restoration
7
Q
How do you modify porcelain preparation for tooth wear cases?
A
- rounded curved prep
- prevent crack propagation
