Treatment planning for extra coronal restoration Flashcards
Why do we use crowns in dentistry
- They are a good way to restore severely broken down teeth
- They protect remaining tooth tissue on broken teeth
- They improve aesthetics
- They potentially last longer than direct restorations
What are the disadvantage associated with using crowns
- Financial cost
- Biological cost as we may need to remove healthy enamel
- Time consuming
- Technically demanding
- Difficult to get the aesthetics right
- Can effect tooth vitality
What do we use crowns to do
- Improve aesthetics for tooth wear patients
- Protect vulnerable teeth
- Be part of a bridge
- Support and retain partial denture
How can crowns improve aesthetics
can improve
1. Tooth colour
2. Tooth shape
What is a bridge Pontic
The tooth hat is being replaced by a bridge
What is a bridge abutment
The crowned tooth
How much prep does a full veneer crown (FVC) require
Buccal margin: 0.5mm
Occlusal reduction: 1-1.5mm
Lingual margin: 0.5mm
How much prep does a metal ceramic crown require
Buccal margin: 1.2-1.5mm
Occlusal reduction: 1.5-2.5mm
Lingual prep: 0.5mm
How much prep does an all ceramic crown (ACC) require
Buccal margin: 1mm
Occlusal reduction: 1.5-2mm
Lingual margin: 1mm
Rank FVC, MCC and ACC in terms of aesthetics from most to least
ACC
MCC
FVC
Rank FVC, MCC and ACC in terms of strength from most to least
FVC
MCC
ACC
Rank FVC, MCC and ACC in terms of biological cost from most to least
ACC
MCC
FVC
Rank FVC, MCC and ACC in terms of financial cost from most to least
ACC
MCC
FVC
Before placing a crown what should we do
- Treat any existing caries
- Manage periodontal disease
- RCT if necessary
- Build up tooth with a core material
