Agar impression materials differ from alginate impression materials in that the former sets by_______________?
Correct answer: B. Physical change
- A. Mechanical action of saliva
- B. Physical change
- C. Evolution
- D. Chemical change
Explanation
Agar changes between sol and gel by heating and cooling, so its setting is a physical change. Alginate, in contrast, sets through an irreversible chemical reaction.
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