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

To add translucency to the final restoration

Answer

To create surface texture and characterization

Answer

To strengthen the ceramic-metal bond chemically

Question 2

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

Accepted Answer

Opaque → Dentin → Enamel → Glaze

Answer

Enamel → Dentin → Opaque → Glaze

Answer

Dentin → Opaque → Enamel → Glaze

Answer

Glaze → Enamel → Dentin → Opaque

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

Cut-back technique

Answer

Layering from deep to surface

Answer

Stratification technique

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

To increase the firing temperature needed

Answer

To add translucency to the ceramic layer

Answer

To activate the bonding agent

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

Apply a thick single layer of high-opacity enamel porcelain

Answer

Use only body dentin to full contour with no translucent layer

Answer

Apply clear glaze directly over dentin without an enamel layer

Question 6

Which type of porcelain powder is typically used to create the illusion of internal characterization such as white horizontal striations in anterior restorations?

Accepted Answer

Effect porcelain or stain porcelain

Answer

Opaque modifier

Answer

Standard dentin body porcelain

Answer

Shoulder porcelain

Question 7

What is 'overbuild' in the context of porcelain layering, and why is it performed?

Accepted Answer

Applying porcelain beyond the final contour to compensate for sintering shrinkage

Answer

Building ceramic to exact final contour before firing

Answer

Adding extra opaque to ensure metal masking

Answer

Applying multiple glaze layers to increase surface hardness