Acid-etching is done for_______________?
Correct answer: A. 30 seconds
- A. 30 seconds
- B. 60 seconds
- C. 90 seconds
- D. 120 seconds
Explanation
The conventional enamel acid-etching time is about 30 seconds, which produces microporosities for resin retention. Longer times are unnecessary and may leave residual acid or weaken the etched surface.
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