Multiple choice

Advantage of acid etching that led to its widespread use is reduction in:

  1. microleakage

  2. porosity of restorative material

  3. polymerization shrinkage of restoration

  4. coefficient of thermal expansion of restoration
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A Correct answer
Explanation

It was first introduced by Buonocore in 1955. He advocated the use of phosphoric acid to etch the enamel. The concentration used is 37%.

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