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ABS TRACT Objective: To compare the push-out bond strength of ProRoot MTA (PRM), Biodentine (BD) and BioAggregate (BA) to root dentin. Material and Methods: Twenty extracted mandibular premolar teeth were used. Serial slices of 1.00 ± 0.05 mm thickness were obtained from the middle third of the roots by sectinon vertically to the long axis using a water-cooled diamond blade on a cutting machine. The specimens were prepared with Gates Glidden burs (sizes 4, 5 and 6) to obtain a standard diameter of 1.3 mm. A total of 60 slices were randomly divided into three groups (n = 20). The root slices were filled with PRM, BD and BA cements. The push-out bond strengths were measured by using a universal testing machine. Force was applied to the fillings with a 1-mm diameter cylindrical stainless steel plunger, at a speed of 1 mm/min. Stereomicroscopic images were obtained at 25× magnification to determine the type of bond failure. Data were analysed using one-way analysis of variance and post hoc Tukey tests. A chi-square test was used to determine if there were any significant association between the type of material and type of failure. Results: PRM and BD each had higher bond strength values than BA (p<0.001). Conclusion: Since the pushout bond strength of ProRoot MTA and Biodentine are higher than BioAggregate, their usage in clinical applications can be advised if seen necessary.

Comparison of Push-Out Bond Strength of Three Calcium Silicate Cements to Dentin