CDC Dental Porcelain Layering & Build-Up Techniques

Question 1

What is the primary purpose of the opaque layer in a porcelain-fused-to-metal (PFM) restoration?

Accepted Answer

To mask the metal substructure and establish the base shade

Answer

The opaque layer is specifically applied to mask the dark metal substructure and establish the foundational shade upon which subsequent dentin and enamel layers are built.

Question 2

Which layering sequence is correct for building a full-contour feldspathic porcelain crown?

Accepted Answer

Opaque → Dentin → Enamel → Glaze

Answer

The correct sequence is Opaque (to mask substructure) → Dentin (to establish body shade and form) → Enamel (to create translucency and final contour) → Glaze (to seal and finalize surface).

Question 3

What technique involves applying dentin porcelain in a lingual-to-facial direction to simulate natural tooth structure?

Accepted Answer

Centripetal build-up

Answer

The centripetal build-up technique mimics natural tooth development by building porcelain from the inside (lingual/incisal core) outward toward the facial surface.

Question 4

When condensing porcelain slurry during build-up, what is the purpose of using a vibrating instrument?

Accepted Answer

To remove excess water and pack particles more densely

Answer

Vibration encourages water migration to the surface where it can be blotted away, resulting in a denser particle packing that reduces porosity and firing shrinkage.

Question 5

What is the recommended approach when building incisal porcelain to achieve natural translucency?

Accepted Answer

Layer translucent and enamel porcelains incrementally with varying translucency

Answer

Incrementally layering porcelains with varying degrees of translucency—including clear, translucent, and enamel shades—replicates the optical depth and light-scattering of natural incisal enamel.

(CDC) Certified Dental Ceramist Practice Test

(CDC) Certified Dental Ceramist Practice Test

CDC Dental Porcelain Layering & Build-Up Techniques