الفهرس 
AcknowledgmentOnly 14 pages are availabe for public view
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Abstract
The apical sealing ability of mineral trioxide aggregate ( MTA ) and Portland cement ( PC ) as apical plugs in an in
vitro apexification model with or without prior calcium hydroxide ( CH ) intracanal medication after using
ifferent irrigation regimens was evaluated in this study
One hundred and twenty six , freshly - extracted ,single - canalled , human , permanent teeth with mature
apices were prepared to simulate the clinical situation of
an open apex