Critical Evaluation of the Push-out Test for Root Canal Filling Materials
Epita S Pane, Joseph EA Palamara, Harold H Messer
JOURNAL OF ENDODONTICS | ELSEVIER SCIENCE INC | Published : 2013
INTRODUCTION: The push-out test has been widely used in experimental endodontics but has been criticized on technical grounds particularly because the soft-core material undergoes plastic deformation under load. This study systematically evaluated the technique by comparing push-out strength and load profiles in relation to core material stiffness, canal diameter, punch diameter, sample orientation, and mode of failure. METHODS: Straight palatal roots of 90 maxillary molars were obturated with an epoxy resin-based sealer alone (10 roots) or gutta-percha (70) or epoxy resin (10) cores with a thin layer of sealer cement. Roots were embedded in mounting resin vertically or at an angle of 5° or ..View full abstract
Supported by the Postgraduate Research Fund of Melbourne Dental School, University of Melbourne, Melbourne, Australia.