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65. which of the following represents the most significant advantage of using acid etch techinque :

Reactions: 

1.microleakage 2.setting shrinkage of restorative material
3.coefficient of thermal expansion of restorative material
4.reduced porosity of restoration


ANS. 1.
Microleakage
in this procedure the tooth surface enamel is treated for about for about one minute with acid etch solution or gel 30-50%phosphoric acid.

CONTRIBUTED BY: Dr. AMIR FROM EGYPT

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