Which of the following is true for hydrocolloids in dentistry?
A) Agar hydrocolloid is a reversible hydrocolloid.
B) When agar powder is mixed with water, it forms a glue-like suspension that entraps the water, making a colloidal suspension called a gel.
C) The main clinical use of reversible hydrocolloid is for impressions for diagnostic casts.
D) Agar hydrocolloid requires the use of custom impression trays.
Correct Answer:
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