Which “time” is best described by the following statement: “Gypsum begins to lose some of the glossy appearance and no longer flows.”

Materials needed to mix and pour gypsum include (more than one answer):

Gypsum products expand externally on setting. Improved stone expands the most.

Kathy and her parents will meet with an orthodontist to discuss an orthodontic treatment plan. At a previous appointment, the orthodontist took impressions of Kathy’s maxillary and mandibular arches. The replicas made from each impression to discuss the treatment plan are termed:

The main difference between the different types of stone are

The water to powder (W:P) ratio used in mixing gypsum products:

A proper (clinically acceptable) alginate impression contains

What is the main reason a vibrator is used when pouring impressions with dental plaster?

Holding the patient’s lip out so that it is completely extended and very tight while taking an alginate impression will result in:

When mixing alginate impression material: