Etching depth after 30 sec for orthodontic bracket with orthophosphoric acid is_________________?
Correct answer: A. 10 um - 20 um
- A. 10 um - 20 um
- B. 3 um - 9 um
- C. 50 um - 110 um
- D. 200 um - 250 um
Explanation
Thirty seconds of phosphoric-acid etching produces a relatively shallow micromechanical retention pattern in enamel, commonly around 10–20 μm for orthodontic bonding. The larger ranges would represent excessive or atypical demineralization depths.
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