Physical Properties of Porcelain Flashcards
Anterior laminates, anterior crowns, and anterior Bridges to 2nd PM should have what porcelain?
IPS e.max (Type B porcelain)
What is the composition of Leucite Reinforced Core?
Glass matrix + 35% KAlSi2O6 Leucite crystals
What is the composition of Feldspar porcelain?
Na/K/Al, Si oxides make a glass matrix that is added to 6-21% KAlSi2O6 Leucite crystals
What porcelain type is indicated for posterior crowns in a patient with bruxism?
Type A BruxZir
What is done to the inside of the Type B porcelain before cementation?
Etch w/ HF acid and treat with Silane to bind to dentin
You should cement Type B porcelain w/ only what cement type and method?
Dual cure or self cure resin cements with dentin bonding agent and self cure activator (bond Link)
What is the core in Type B Porcelains ?
Lithium di-silicate
What are the cores in Type A porcelains?
Aluminum oxide or Zirconium oxide
What cement is usable with Type A porcelains?
Self-adhesive resin, compomer, or RMGI
Why can you not use VLC cements with Type A porcelains?
Type A porcelain is too opaque
Why can you not use Zinc Phosphate cements with Type A porcelains?
Type A porcelain would be too soluble with such cements
Why can you not use Glass ionomer cements with Type A porcelains
An acidic reaction would result
Do not use what cements with Type A porcelains?
No Glass ionomer, Zinc phosphates, or VLC cements
How are Type A Porcelains (all ceramic crowns with CAD/CAM cores) characterized with regards to strength and esthetics?
- High strength
2. Lower esthetics
For a PFM, what is the thickness of the metal coping with feldspar?
- 3-0.5 mm in the veneered area
1. 0 mm in the unveneered area
What is the coefficient of thermal expansion for Ney Option high Pd for Feldspar porcelain?
14.4x10-6 cm/K
What metals are used in the Feldspar porcelain coping and what must its thermal expansion be in relation to porcelain?
78% Pd, 8% Cu, 2% Au
The coefficient of thermal expansion of metal and porcelain must match
List the Type A porcelains.
- Aluminum oxide core (Procera)
- Zirconium Oxide core + veneer porcelain
- All zirconium oxide
List the Type B porcelains.
- Leucite reinforced lithium dicilicate
2. Lithium disilicate
What porcelain is used at VCU for PFMs?
Feldspar
