California Registered Dental Assistant (RDA) Written Practice Exam

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Master the California Registered Dental Assistant (RDA) Written Exam with our comprehensive practice quiz. Tailored to mimic real exam conditions, it's your key to unlocking success and advancing your dental assisting career.

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An insulating base is placed in/on the ______ of a cavity preparation.

Pulpal Floor
Marginal Ridge
Cavity Wall
Enamel Surface

The correct answer is: Pulpal Floor

The pulpal floor is the correct answer because it refers to the bottom surface of the cavity preparation where the base material is placed. Option B, marginal ridge, is incorrect because it refers to the raised edges of the preparation, not the bottom surface where the base is placed. Option C, cavity wall, is also incorrect because it refers to the sides of the preparation, not the bottom surface. Option D, enamel surface, is incorrect because it refers to the outer layer of the tooth, not the specific location within the preparation.