title: Effects of various mixing techniques on push-out bond strengths of white mineral trioxide aggregate.
abstract: BACKGROUND
  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 × 4 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.
authors.affiliation: Endodontic Department, Dental and Periodontal Research Center, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran. shahriar_shahi@yahoo.com
authors.forename: Shahriar
authors.initials: S
authors.lastname: Shahi
authors.forename: Saeed
authors.initials: S
authors.lastname: Rahimi
authors.forename: Hamid Reza
authors.initials: HR
authors.lastname: Yavari
authors.forename: Mohammad
authors.initials: M
authors.lastname: Samiei
authors.forename: Maryam
authors.initials: M
authors.lastname: Janani
authors.forename: Mahmoud
authors.initials: M
authors.lastname: Bahari
authors.forename: Majid
authors.initials: M
authors.lastname: Abdolrahimi
authors.forename: Farzaneh
authors.initials: F
authors.lastname: Pakdel
authors.forename: Amirala
authors.initials: A
authors.lastname: Aghbali
mesh_terms: D000268:Adhesiveness; D017607:Aluminum Compounds / Q000737:chemistry*; D017610:Calcium Compounds / Q000737:chemistry*; D001840:Dental Bonding; D003786:Dental Pulp Cavity / Q000648:ultrastructure; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure; D004338:Drug Combinations; D006801:Humans; D008422:Materials Testing; D010087:Oxides / Q000737:chemistry*; D012387:Root Canal Filling Materials / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors; D014465:Ultrasonics; D014732:Vibration
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D004338:Drug Combinations; D010087:Oxides; D012387:Root Canal Filling Materials; D017640:Silicates; C086631:mineral trioxide aggregate