The chemical used to etch enamel is_______________?
Correct answer: C. Phosphoric acid
- A. Zinc oxide
- B. Methyl methacrylate
- C. Phosphoric acid
- D. Eugenol
Explanation
Phosphoric acid selectively dissolves the superficial mineral of enamel, creating microporosities for micromechanical bonding. Zinc oxide, methyl methacrylate and eugenol do not produce the standard enamel-etching pattern.
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