INBDE (Integrated National Board Dental Examination) Practice Exam

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What compound controls the setting rate of alginate?

Calcium sulfate
Potassium alginate
Trisodium phosphate
Sodium chloride

The correct answer is: Trisodium phosphate

Trisodium phosphate is the compound that controls the setting rate of alginate. Trisodium phosphate works as a retarder in alginate materials, slowing down the setting time to allow for adequate mixing and impression-taking. Incorrect options: - Calcium sulfate is used in gypsum products, not alginate. - Potassium alginate is the salt form of alginic acid and is not used to control the setting rate of alginate. - Sodium chloride is commonly known as table salt and is not involved in controlling the setting rate of alginate.