INBDE (Integrated National Board Dental Examination) Practice Exam

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Which of the following is a main component of the alginate powder and functions as the filler?

Zinc oxide
Calcium sulfate
Potassium alginate
Diatomaceous earth (silica)

The correct answer is: Diatomaceous earth (silica)

Diatomaceous earth (silica) is the correct answer because it is the main component of the alginate powder and functions as the filler. Zinc oxide is not a main component of alginate powder and rather acts as an accelerator. Calcium sulfate is not a main component either and is instead used as a gel strengthener. Potassium alginate is a form of alginate itself, and therefore cannot be a component of the powder.