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

Question: 1 / 400

On what tooth structure is calcium hydroxide placed?

Enamel

Dentin

Calcium hydroxide is typically placed on dentin. While it can also be used on enamel, cementum, and the pulp chamber, it is most commonly used on dentin due to its ability to stimulate the formation of reparative dentin. Enamel is not an ideal surface for calcium hydroxide as it can erode and weaken the enamel. Cementum is also not a preferred placement for calcium hydroxide as it is less porous and lacks the necessary dentinal tubules for the material to be fully effective. The pulp chamber is not a suitable placement for calcium hydroxide as it can potentially cause tissue irritation and inflammation. Overall, dentin is the best and most commonly utilized surface for calcium hydroxide placement.

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Cementum

Pulp Chamber

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