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

Degassing creates a controlled, thin oxide layer on the metal surface that chemically bonds with the opaque porcelain.

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

Zirconia offers the highest flexural strength among dental ceramics, making it ideal for full-contour posterior crowns and bridges.

Question 3

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

Accepted Answer

The lightness or darkness of the shade

Answer

Value describes the relative lightness or darkness of a shade, ranging from very light (high value) to very dark (low value).

Question 4

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

Accepted Answer

700–850°C

Answer

Feldspathic dental porcelains typically fire between 700°C and 850°C, depending on the specific formulation and manufacturer guidelines.

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

Metamerism occurs when two materials look like the same color under one light condition (e.g., dental light) but differ under another (e.g., natural daylight).

(CDT) Certified Dental Technicians Practice Test

(CDT) Certified Dental Technicians Practice Test

CDT CDT Ceramics & Porcelain Techniques 2