Koçak, M M Apical extrusion of debris using ProTaper Universal and ProTaper Next rotary systems. [electronic resource] - International endodontic journal Mar 2015 - 283-6 p. digital Publication Type: Comparative Study; Journal Article ISSN: 1365-2591 Standard No.: 10.1111/iej.12313 doi Subjects--Topical Terms: BicuspidDental InstrumentsEquipment DesignHumansIn Vitro TechniquesMaterials TestingRoot Canal Preparation--instrumentationTooth Apex--surgery