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Quantitative evaluation of apical extrusion of intracanal b..:

Priyanka Ghogre ; Hemant Ramesh Chourasia ; Manish Agarwal...
http://www.ijdr.in/article.asp?issn=0970-9290;year=2015;volume=26;issue=4;spage=406;epage=410;aulast=Ghogre.  , 2015