California Registered Dental Assistant (RDA) Written Practice Exam

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What ingredient in the powder of glass ionomer cement aids in the inhibition of recurrent decay?

  1. Fluoride

  2. Phosphate

  3. Calcium

  4. Silica

The correct answer is: Calcium

One might mistake fluoride as the answer due to its well-known role in preventing tooth decay. However, in this case, it is calcium that aids in inhibiting recurrent decay in glass ionomer cement. Calcium provides a slow release and rechargeable source of fluoride ions, which helps to maintain a protective layer on the tooth surface and prevent recurrent decay. The other options, phosphate and silica, are also commonly found in glass ionomer cement but do not play a significant role in inhibiting recurrent decay. So while they may contribute to the overall properties of the cement, they are not the key ingredient for preventing tooth decay in this case.

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