California Registered Dental Assistant (RDA) Written Practice Exam

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What is another name for irreversible hydrocolloid?

Gelatin
Alginate
Pectin
Agar

The correct answer is: Alginate

Irreversible hydrocolloid, also known as irreversible alginate, is a commonly used dental impression material. Option A, gelatin, is incorrect because gelatin is a reversible hydrocolloid and can be melted and re-set multiple times. Option C, pectin, is a type of gelling agent but it is not used for dental impressions. Option D, agar, is a type of seaweed extract, used mainly in laboratories and food preparations, and is not commonly used for dental impressions. Therefore, option B, alginate, is the most accurate and appropriate answer.