California Registered Dental Assistant (RDA) Written Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

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

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.

Get further explanation with Examzify DeepDiveBeta

Marginal Ridge

Cavity Wall

Enamel Surface

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