CDC Laboratory Techniques & Technology 5

Question 1

Which characteristic of a porcelain furnace most directly affects the reproducibility of ceramic color between firings?

Accepted Answer

Thermocouple calibration accuracy

Answer

An accurately calibrated thermocouple ensures the actual muffle temperature matches the set temperature, which is critical for consistent ceramic maturation and shade.

Question 2

A ceramist is building a layered ceramic crown and notices the dentin porcelain slumping during firing. The MOST likely cause is:

Accepted Answer

Porcelain mixed with too much modeling liquid (over-wet)

Answer

Excess liquid in the porcelain mix reduces surface tension during firing, causing the ceramic mass to slump and lose anatomical form.

Question 3

In digital dentistry, an intraoral scanner exports data in which standard file format that dental CAD software reads?

Accepted Answer

.STL or .PLY

Answer

STL (Standard Tessellation Language) and PLY are the standard mesh file formats used to transfer three-dimensional scan data between digital dentistry devices and software.

Question 4

What is the purpose of applying multiple thin layers of opaque porcelain rather than one thick layer over a metal framework?

Accepted Answer

To achieve better opacity with fewer internal bubbles and stronger bond

Answer

Thin opaque layers fire more completely, minimize trapped air voids, and create a stronger oxide-to-ceramic interface than a single thick application.

Question 5

Which clinical situation requires a ceramist to fabricate a restoration with a subgingival margin rather than a supragingival margin?

Accepted Answer

When esthetics demand concealing the crown margin below the gingival tissue

Answer

Subgingival margins are placed when esthetic requirements demand that the crown-tooth junction be hidden by gingival tissue, particularly in the esthetic zone.

(CDC) Certified Dental Ceramist Practice Test

(CDC) Certified Dental Ceramist Practice Test

CDC Laboratory Techniques & Technology 5