CDC Dental Porcelain Layering & Build-Up Techniques 2

Question 1

In the cut-back technique for anterior all-ceramic restorations, what is removed after the initial bisque bake?

Accepted Answer

The entire incisal third of the ceramic build-up

Answer

In the cut-back technique, the incisal third of the bisque-fired dentin build-up is carved away and replaced with translucent enamel and effect porcelains to create natural incisal depth and optical complexity.

Question 2

What is the significance of the 'mamelons' when building an anterior ceramic restoration?

Accepted Answer

They are lobe-shaped dentin masses at the incisal edge replicated with internal effect porcelains

Answer

Mamelons are the three rounded protuberances of dentin seen at incisal edges of young teeth; ceramists replicate them internally using dentin and effect porcelains to achieve lifelike anterior aesthetics.

Question 3

Which principle guides the ceramist when determining how much cervical porcelain to apply in a zirconia-based layered crown?

Accepted Answer

Less ceramic thickness is needed at the cervical due to the natural darker shade of the zirconia core and lower translucency demands

Answer

At the cervical third, the tooth is naturally darker and less translucent, so thinner ceramic layers over the zirconia substructure are appropriate since the core color contributes to the overall shade in that region.

Question 4

When porcelain build-up results in a 'green' (unfired) restoration that appears too opaque, what is the most likely cause?

Accepted Answer

Over-application of opaque porcelain that shows through subsequent translucent layers

Answer

Excessive opaque application creates a flat, opaque appearance because the opaque layer's high reflectivity masks the depth and translucency provided by the overlying dentin and enamel layers.

Question 5

What does the term 'bisque bake' refer to in the ceramic layering process?

Accepted Answer

An intermediate firing that sinters the ceramic to a firm but unfinished state for contouring

Answer

A bisque bake is an intermediate firing that partially sinters the ceramic, creating a firm structure that can be contoured, adjusted, and characterized before the final glaze firing.

(CDC) Certified Dental Ceramist Practice Test

(CDC) Certified Dental Ceramist Practice Test

CDC Dental Porcelain Layering & Build-Up Techniques 2