INBDE (Integrated National Board Dental Examination) Practice Exam

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All of the following impression materials set by a stepwise polymerization reaction EXCEPT one. Which one?

  1. Polyethers

  2. Polysulfides

  3. Polyvinyl siloxanes

  4. Condensation silicones

The correct answer is: Polyvinyl siloxanes

Polyvinyl siloxanes set by a single-step polymerization reaction, whereas the other impression materials listed use a stepwise polymerization reaction. Polyethers, polysulfides, and condensation silicones all require multiple steps to set, which can affect the accuracy and time frame of the impression. This makes them less desirable compared to polyvinyl siloxanes, which can set quickly and accurately in just one step.

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