CCE Ceramic Application & Contouring 3

Question 1

A ceramist is building a lower molar crown and must recreate the Curve of Spee in the ceramic occlusal surface. Which anatomical feature guides this determination?

Accepted Answer

The anteroposterior curvature of the mandibular arch from canine to second molar

Answer

The mesiodistal width of the opposing tooth

Answer

The horizontal overlap of anterior teeth

Answer

The vertical dimension of occlusion only

Question 2

When applying dentin ceramic, the appropriate liquid-to-powder ratio for optimal brushability and minimal air incorporation is best described as:

Accepted Answer

Firm paste that holds its shape but flows slightly when vibrated

Answer

Soupy and fluid to ensure complete coverage of the substructure

Answer

Dry and crumbly to maximize powder packing

Answer

Saturated slurry that spreads under its own weight

Question 3

What technique is used to prevent ceramic slumping on steep axial walls during the build-up phase?

Accepted Answer

Use a thicker mix and apply in horizontal increments, allowing partial setting between layers

Answer

Increase firing temperature to stiffen the ceramic before full sintering

Answer

Apply a retaining agent coat over the metal before ceramic application

Answer

Apply all ceramic mass at once and fire immediately without blotting

Question 4

Which staining technique adds surface characterization to a ceramic restoration after initial glaze firing?

Accepted Answer

External surface staining fired at low temperature after glaze

Answer

Internal staining applied before the first dentin wash fire

Answer

Opaque staining blended with body ceramic before buildup

Answer

Metal oxide coloring added to the investment prior to casting

Question 5

When matching the contour of a ceramic crown to its natural adjacent teeth, the ceramist should evaluate the restoration from which viewing perspective first?

Accepted Answer

Facial view at eye level to assess height, width, and emergence profile

Answer

Occlusal view only, to confirm cusp height

Answer

Lingual view to verify cingulum position

Answer

Proximal view to check marginal ridge height only

Question 6

A ceramist notices micro-cracks on the surface of a zirconia crown after ceramic layering. The most likely cause is:

Accepted Answer

Thermal shock from uneven heating or cooling rates during firing

Answer

Insufficient opaque application over the zirconia framework

Answer

Over-condensation of the ceramic powder during buildup

Answer

Using body ceramic designed for PFM on a zirconia coping

Question 7

The 'hold time' at peak temperature during ceramic firing is important because it allows:

Accepted Answer

Full sintering and maturation of ceramic particles without additional temperature increase

Answer

The oven to cool slowly before opening the muffle

Answer

Metal substructure to expand to match ceramic coefficient of thermal expansion

Answer

Air pockets to escape through surface pores before glazing