California Registered Dental Assistant (RDA) Written Practice Exam

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What impression material is commonly used when taking a final impression for a partial?

Alginate
Silicone
Polysulfide
Elastomeric

The correct answer is: Elastomeric

Elastomeric impression material is used when taking a final impression for a partial. Alginate is used for preliminary impressions and is not as accurate as elastomeric materials. Silicone and polysulfide are also used for final impressions, but they are not as popular as elastomeric materials due to their longer setting times and higher cost. Therefore, the most commonly used material for taking a final impression for a partial is elastomeric.