DANB General Chairside Practice Test

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Which material would NOT be suitable for taking a final impression for a prosthetic device?

Alginate hydrocolloid
Polyether
Polyvinyl siloxane
Silicone rubber

The correct answer is: Alginate hydrocolloid

Alginate hydrocolloid is generally not suitable for taking a final impression for a prosthetic device due to its properties. While alginate is commonly used for preliminary impressions because of its ease of use and quick setting time, it does not have the dimensional stability required for final impressions. It tends to undergo distortion and moisture loss after setting, which can lead to inaccuracies in the impression. In contrast, materials like polyether, polyvinyl siloxane, and silicone rubber are favored for final impressions because they offer superior accuracy, stability, and detail reproduction. These materials also have less shrinkage over time, ensuring that the impressions remain true to the original anatomy, which is critical for the successful fabrication of prosthetic devices.