CDT CAD/CAM Digital Dentistry 2

Question 1

Which file format is the industry standard for sharing digital impression data between scanners and milling software?

Accepted Answer

STL (Standard Tessellation Language)

Answer

STL is the most widely accepted open format for sharing 3D scan data across CAD/CAM systems.

Question 2

When milling zirconia, which milling stage requires the material to be in its pre-sintered (soft) state?

Accepted Answer

Green-state milling before sintering

Answer

Pre-sintered (green-state) zirconia is milled before the final sintering cycle that shrinks and densifies the material.

Question 3

What does the term 'emergence profile' refer to in CAD design of a crown?

Accepted Answer

The contour of the restoration as it exits the gingival margin

Answer

Emergence profile describes how the restoration transitions from the subgingival finish line through the gingival tissue.

Question 4

Which milling parameter most directly affects the surface roughness of a milled ceramic restoration?

Accepted Answer

Stepover distance between toolpaths

Answer

A smaller stepover distance between adjacent toolpaths produces a smoother surface by reducing the scallop height.

Question 5

In a chairside CAD/CAM workflow, which component captures the optical impression directly in the patient's mouth?

Accepted Answer

Intraoral scanner

Answer

An intraoral scanner uses structured light or laser to capture a digital impression without impression material.

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