Effects of Various Mixing Techniques on Push-out Bond Strengths of White Mineral Trioxide Aggregate

Abstract

Introduction: The aim of this study was to evaluate the effect of 3 different mixing methods on push-out bond strength of white tooth-colored mineral trioxide aggregate (MTA). Methods: Sixty 2-mm-thick root sections were prepared from 60 single-rooted human teeth and filled with MTA. The samples were randomly divided into 3 groups (n = 20) of MTA mixed by ultrasonic, trituration, or conventional methods and then allowed to set for 72 hours in a synthetic tissue fluid environment. Push-out bond strength values of the specimens were measured by a universal testing machine and examined under a stereomicroscope at x4 to determine the nature of the bond failure. Results: The means of push-out bond strength values of white MTA in the ultrasonic, conventional, and trituration groups were 105.67 +/- 12.79, 118.95 +/- 12.76, and 99.60 +/- 14.27 MPa, respectively. The differences between the 3 groups were not statistically significant. Conclusions: On the basis of the results of this study, it can be concluded that different mixing methods have no significant effect on push-out bond strength of white MTA. (J Endod 2012;38:501-504)