66.Files are used in endodontic preperation to:

1.clean 2.shape

3.improve access 4.facilitate obturation

a.all b.1,2,3 c.1,2,4 d.2,3,4

ANS : c

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

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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64.E.D.T.A. is chelating agent that:

1.lubricates

2.emulsifies

3.hold debris in suspension

4.remove smear layer

5.all of the above

ANS. 5

REF.pathway of the pulp eighth edition p.259

CONTRIBUTED BY: Dr. AMIR FROM EGYPT

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