California Registered Dental Assistant (RDA) Written Practice Exam

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What are the ways for sealant materials to harden?

  1. Polymerization, light-cure, self-cure

  2. Freezing

  3. Heating up

  4. Dehydration

The correct answer is: Polymerization, light-cure, self-cure

Sealant materials harden through a process called polymerization, where the molecules in the material form long chains, increasing its strength and durability. The other options B, C, and D are not suitable for sealant materials as they do not have the same properties needed for hardening. Freezing can damage the material, heating up can cause it to expand and deform, and dehydration can cause it to shrink and crack. Therefore, options B, C, and D are incorrect ways for sealant materials to harden.

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