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

Only the glaze layer

Answer

The cervical margin porcelain

Answer

The opaque dentin layer at the gingival third

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

They refer to the gingival embrasure contours that affect periodontal health

Answer

They describe the ceramic thickness at the lingual concavity

Answer

They are the areas of highest opacity in the dentin layer

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

Cervical area always uses the darkest shade available

Answer

Cervical build-up should be thicker than the incisal to compensate for zirconia reflectance

Answer

No layering porcelain should ever be applied at the cervical third

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

Insufficient water added to the ceramic powder

Answer

Incorrect layer sequence with enamel applied before dentin

Answer

The kiln temperature was set too low

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

The final high-gloss glaze firing at maximum temperature

Answer

The initial opaque firing cycle

Answer

A low-temperature drying cycle to remove moisture only

Question 6

When layering porcelain for a posterior molar crown, how should the ceramist approach occlusal anatomy build-up?

Accepted Answer

Build cusps and fissures in the green state to full anatomical contour before firing, then adjust minimally

Answer

Build a flat occlusal surface and rely entirely on grinding to create cusps post-firing

Answer

Apply only glaze to the occlusal surface to maximize strength

Answer

Always leave the occlusal surface to be fabricated by the clinician chairside

Question 7

What is the purpose of applying a 'cervical modifier' or 'gingival porcelain' at the marginal area of a restoration?

Accepted Answer

To simulate the naturally darker, more saturated color of the cervical region close to the gingival tissue

Answer

To seal the margin against bacterial contamination after cementation

Answer

To increase the thickness of ceramic at the margin for strength

Answer

To bond the porcelain more securely to the die stone model