1.Which ,if left untreated,is most likely to result in a periaplical lesion? a.internal resorbt. b.reversible pulpitis c.ac.suppurative pulpitis d.ch.hyperplastic pulpitis e.diffuse calcification of the pulp 2.An acperiap. abscess originating from a mand. third molar generally point and drains in the: a.submandibular space b.pterygomandibular space c.bucccal vestibule d.buccal space 3.Do you know the most undesirable propertie of sodiun chloride? 4.What is the most likely direction to perforate when you prepare the root canal for central maxilar incisives:mesial, distal, labial or lingual? 5.Who are more:the mand.first molar with 3 or with 4 canals?Give percents for sustaining the statement. 6.Where the apical foramen leaves the root: at the anatomical apex or away from it?