The Effect of Various Mixing Techniques on the Push-Out Bond Strength of Calcium Enriched Mixture

STATEMENT OF THE PROBLEM Correct proportioning and mixing are essential to ensure cements attain their optimum physical properties. PURPOSE The aim of this experimental study was to evaluate the influence of various mixing techniques including manual, mechanical mixing, and ultrasonic vibration on push-out bond strength of calcium enriched mixture (CEM). MATERIALS AND METHOD Ninety 2-mm-thick dentin disks were prepared from single-rooted human teeth and filled with CEM mixed with manual, trituration, or ultrasonic methods. Push-out bond strength values of the specimens were measured by a universal testing machine after 3 and 21 days. The samples were then examined under a stereomicroscope at 40× magnification to determine the nature of bond failure. Data were analyzed by Kruskal-Wallis and Mann-Whitney test. (p< 0.05). RESULTS The highest (7.59 MPa) and lowest (4.01 MPa) bond strength values were recorded in conventional method (after 21 days) and trituration method (after 3 days), respectively. There was no statistically significant difference between the three techniques in 3 and 21 days. CONCLUSION According to the results, various mixing techniques had no effect on the push-out bond strength of CEM cement.