CCE CCE Finishing & Surface Characterization

Question 1

Which finishing method is preferred to achieve the highest surface smoothness on feldspathic porcelain before glazing?

Accepted Answer

Sequential polishing with decreasing grit silicone points and diamond pastes

Answer

Coarse diamond bur adjustment followed by direct glazing

Answer

Sandblasting with 50 µm alumina

Answer

Acid etching with hydrofluoric acid

Question 2

Auto-glazing of dental porcelain refers to:

Accepted Answer

Firing the porcelain to its fusion temperature so the surface material itself becomes smooth and glassy

Answer

Applying a separate glaze material and firing it

Answer

Sandblasting to create a high-polish effect

Answer

Applying a light-cure surface sealant

Question 3

What is the primary risk of over-polishing a ceramic restoration?

Accepted Answer

Rounded and flattened surface anatomy reducing esthetic characterization

Answer

Increased surface porosity

Answer

Weakening of the zirconia substructure

Answer

Excessive glaze thickness

Question 4

Surface texturing on anterior ceramic restorations serves primarily to:

Accepted Answer

Mimic natural enamel lobes, perikymata, and developmental grooves for improved esthetics

Answer

Increase the bond strength to the cement

Answer

Reduce the firing shrinkage of the ceramic

Answer

Improve the accuracy of shade measurements

Question 5

Which instrument is most appropriate for adding fine surface texture to an unglazed feldspathic ceramic surface?

Accepted Answer

Fine diamond bur or texturing stone used at low speed

Answer

Green stone

Answer

Coarse sandpaper disc

Answer

Ultrasonic scaler

Question 6

After chairside adjustment of a glazed ceramic crown with a diamond bur, the ceramist should:

Accepted Answer

Polish the adjusted area with rubber points and diamond paste, then re-glaze if possible

Answer

Leave the adjusted area unfinished as it will self-polish in function

Answer

Apply composite resin over the adjusted area

Answer

Sandblast the entire crown and refire