RDA Practice Exam – California RDA Test Prep & Free Practice Test (2025)

Question: 1 / 400

What does the dentinal sealer seal?

Enamel Cracks

Dentinal Tubules

Dentinal sealer, also known as dentinal bonding agent, is a material used in dentistry to seal the dentinal tubules. These tubules are small channels in the dentin, the layer of tooth structure beneath the enamel, and contain nerve endings that can cause tooth sensitivity if left exposed. By sealing these tubules, dentinal sealer helps to prevent sensitivity and improve the bond between the tooth and filling material. None of the other options mentioned are related to the function of dentinal sealer. Enamel cracks are typically repaired with fillings or crowns, the gum line is not sealed but rather protected by the gum tissue, and cavity margins are the edges of a cavity that are prepared before filling it. Therefore, these options are not correct for what dentinal sealer specifically seals.

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Gum Line

Cavity Margins

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