All ceramic restorations

Question 1

What are the different types of all ceramic restorations

Answer 1

High strength substructure - zirconia or alumina
Resin bonded restorations - Feldspathic type ceramics
Lithium disilicate - stronger materials

Question 2

What is used to etch the ceramic?

Answer 2

HF

Question 3

What is the production of all ceramic restorations via sintering

Answer 3

Feldspathic ceramic
Ceramic frit (powder) particles are packed tightly together
Fired at 90 degrees
Ground ceramic -> heat -> fusing temp -> Sintering -> cool -> fused ceramic

Question 4

How can the ceramic particles be supported during firing?

Answer 4

Refractory model or platinum foil

Question 5

What is the platinum foil technique?

Answer 5

Foil shell supports the ceramic particles in the furnace, this technique was used for PJC’s

Question 6

What are the production problems?

Answer 6

Feather margins are susceptible to fracture
Duplication of die in refractory material may introduce error
Refractory/ceramic compatibility is sensitive
Removing refractory from finished restoration
Fitting the restoration to the original die and to the prepared tooth difficult because of fragility of the material

Question 7

What is the production via the pressing technique?

Answer 7

A wax pattern is produced

Lost wax process to convert the wax pattern into ceramic

Question 8

What is the process for resin bonded restorations?

Answer 8

Sintered, pressed milled, material must be etched and restoration bonded