CDT CDT Ceramics & Porcelain Techniques 2

Question 1

What is the purpose of degassing (oxidizing) a metal coping before porcelain application?

Accepted Answer

To create a controlled oxide layer that promotes porcelain adhesion

Answer

To increase metal hardness

Answer

To remove surface oxides that prevent porcelain bonding

Answer

To reduce the melting point of the alloy

Question 2

Which type of ceramic is most commonly used for full-contour posterior restorations due to its strength and wear resistance?

Accepted Answer

Zirconia

Answer

Feldspathic porcelain

Answer

Leucite-reinforced glass ceramic

Answer

Lithium disilicate

Question 3

What does 'value' refer to in the Vita shade system?

Accepted Answer

The lightness or darkness of the shade

Answer

The hue or color family of the tooth

Answer

The chroma or saturation of the color

Answer

The translucency level of the porcelain

Question 4

What is the recommended firing temperature range for most feldspathic dental porcelains?

Accepted Answer

700–850°C

Answer

400–600°C

Answer

900–1000°C

Answer

1100–1300°C

Question 5

What is 'metamerism' in shade matching?

Accepted Answer

Two colors that appear to match under one light source but differ under another

Answer

The tendency of porcelain to crack under thermal cycling

Answer

The chemical reaction between metal and porcelain during firing

Answer

A technique for blending incisal and body porcelains

Question 6

Which finishing technique is used to create surface texture on ceramic restorations that mimics natural enamel?

Accepted Answer

Characterization with porcelain texturing stones and polishing

Answer

Grinding with a coarse diamond bur

Answer

Selective glazing with stains

Answer

Sandblasting with 50-micron alumina