Anterior Metal Ceramic Crown Flashcards
What are we aiming to achieve when preparing for an anterior MCC
- Chamfer
- Wing
- Incisal notch
- Shoulder
- Axial redcution
What principles do we need to follow when preparing an anterior MCC
- Allow adequate room for sufficient thickness of metal and porcelain
- Have retention and resistance forms
- No undercuts
- Margins supra-gingiva where possible
- Chamfer margin for metal
- Shoulder margin for metal+ porcelain
- Be as conservative as possible
Name the ideal metal used for MCC
Gold
Why is gold the ideal metal for an anterior MCC
As it gives longevity
What are the drawbacks of using gold for an anterior MCC
Bonding may not be as good as composite systems
How much space does an anterior MCC need
- 2mm
- 5 for the metal
- 2 For opaque porcelain
- 5 for porcelain
How much incisor reduction are we aiming to achieve?
2mm
How many planes does the labial reduction need?
2 plane reduction
Name the 2 planes we are aiming to achieve during labial reduction
- One plane closest to the gingival Margin
2. 2nd plane closer to the incisal edge
How do we carry out labial reduction
We keep our burr parallel to the axis of the tooth initially
We follow the 2 planes of the labial side
How many mm do we need to prepare the shoulder margin by?
1.2mm
What do we use to repave the shoulder margin
The should burr
Overall how much reduction do we need on each side of the tooth
Buccal: 1.2-1.5mm reduction
Incisal tip: 2mm reduction
Palatal side: 0.5-0.7mm
What is the purpose of an anterior MCC
- To protect the weakened tooth
- To restore the tooth to function
- To improve aesthetics
What does a chamfer provide in an anterior MCC prep
Marginal integrity