Ceramic Crowns Flashcards
Name 4 types of all ceramic crowns
- Dentine bonded /360 veneer
- Empress
- Emax
- Zirconia
Dentine bonded crown is made from
Feldspathic porcelain
Empress crown is made from
Leucite reinforced glass ceramic
Which is stronger Empress or Zirconia
Zirconia
Name two types of Zirconia crowns
- Monolithic - better posterior but don’t get a ‘bond’ hard to adjust and can wear adjacent tooth
- Layered = Zirconia + porcelain
Upper tooth where is the functional bevel
Palatal cusps
Where is the lower tooth functional cusp bevel
Buccal
What’s another name for a feldspathic crown
Dentine bonded crown
What type of cement is used for veneers
Composite filling material
What are the advantages of composite veneer cement
Increased filler therefore less shrinkage less chance of porcelain fracture less chance of composite washing away
Better longevity
What are the disadvantages of composite cement
Thick and needs to be heated to make it more runny
Will only work if the prep is 2mm or less
Name two types of emax
Monolithic : one piece stronger pressed
Layered : emax substructure and porcelain -most aesthetic
What cement is required to cement a Zirconia crown
Resin reinforced gic
Why are 2 retraction cords used
Vertical and horizontal retraction
What is the disadvantage of a dual cure cement
The amide linkages will over time cause yellowing.
