California Registered Dental Assistant (RDA) Written Practice Exam

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What type of impression is taken to the dental laboratory for the fabrication of a crown?

Preliminary

Final

A final impression is necessary for the fabrication of a crown because it captures the exact shape and position of the prepared tooth. A preliminary impression may be taken initially, but it is not as accurate as a final impression. A bite registration is used to determine how the upper and lower teeth come together, but it is not used for the fabrication of a crown. A study model is a replica of the oral structures, but it is not used for the fabrication of a crown. Therefore, the most accurate and detailed impression needed for fabricating a crown is a final impression.

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Bite Registration

Study Model

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