irs-t all ceramic restorations

Question 1

What types?

Answer 1

High strength substructure- Zirconia/alumina

Resin bonded- feldespathic

Lithium disilicate- stronger (E max)

Question 2

What is a resin bonded restoration?

Answer 2

All ceramic, no substructure
Must be susceptible to etching
HF
Feldespathic ceramic- containing leucite
Lithium disilicate or equivalent

Question 3

How are the ceramic particles supported during firing?

Answer 3

Refractory model
OR
Platinum foil (used extensively for porcelain fracker crown)

Question 4

What are production problems?

Answer 4

1. Feather margins susceptible to fracture
2. Duplication of due in refractory material- may error
3. Sensitive refractory/ceramic compatibility
4. Removing refractory from restoration
5. Fitting restoration to original due and prepped tooth difficult- fragile

Question 5

What is the pressing technique?

Answer 5

Wax pattern
Lost wax process- convert to ceramic