<![CDATA[Aim: To evaluate the effect of ultrasonic agitation for retrograde biodceramic root repair, MTA and biodentinefilling materials on push-out bond strength to dentine walls.Materials and Methods: Ninety extracted human teeth with single straight roots were selected randomly.After disinfection and cleaning, the coronal portions were sectioned to standardize the root canal length at15mm. following root canal shaping, obturation and apical roots resection, retrograde cavities were prepared.Teeth were categorized depending on the filling material used into three groups, 30 teeth each. Group Afilled with bioceramic root repair material, B with MTA and C with Biodentine material. These groups weredivided in to three subgroup (n=10). Subgroups:A1, B1, and C1 cavities were filled with the aid of condenser.A2, B2, and C2 with ultrasonic agitation of material for 30 seconds. A3, B3, and C3 with ultrasonic agitationof material for 60 seconds. Push-out bond strength test was done for the samples to specify bond strengths atthe cement/dentin interfaces. The specimens were examined using a stereomicroscope to estimate the modeof failure. Data were statistically analyzed using two-way ANOVA and Bonferonni test.Results: Ultrasonic agitations increase the bond strength for all cements. BiodentineTM, PD™ MTAWhiteand TotalFill®BC RRM™ were significantly increased (P<0.05). While, increasing the time of ultrasonicwas statically non-significant among groups.Conclusions: Ultrasonic agitation of root-ending filling materials showed increase in push-out boundstrength to dentine walls.]]>
