Etching depth after 30 sec for orthodontic bracket with orthophosphoric acid is_________________?
(A) 10 um – 20 um
(B) 3 um – 9 um
(C) 50 um – 110 um
(D) 200 um – 250 um
Etching depth after 30 sec for orthodontic bracket with orthophosphoric acid is_________________?
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