Why do impression trays have perforations?
A)Provides for easier clean-up after pouring.
B)Provide adequate air circulation for proper setting times.
C)Allow material to push through the holes, creating a mechanical lock that keeps the material in place.
D)All of the above are correct

Question

Quizplus · Accepted Answer

The perforations in a perforated full arch tray serve to allow material to push through the holes, creating a mechanical lock that keeps the material in place. Air circulation does not change setting times, and the holes do not provide for easier clean-up after pouring.

Why Do Impression Trays Have Perforations