Most advantageous indication of acid etching is______________?
Correct answer: C. Decrease micro leakage
- A. Decrease coefficient of thermal expansion
- B. Decrease polymerization shrinkage
- C. Decrease micro leakage
- D. Decrease porosity in restorative material
Explanation
Acid etching creates microporosities and increases surface energy, allowing resin to penetrate enamel and form micromechanical retention; this improves the seal and reduces microleakage. It does not directly reduce polymerization shrinkage or thermal expansion.
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