الفهرس | Only 14 pages are availabe for public view |
Abstract Aim: This in vitro study was carried out to evaluate the effect of lowering the temperature used with continuous wave compaction (CWC) from 200{u00B0}C to 150{u00B0}C on the push-out bond strength and interfacial adaptation of TotalFill BC sealer in relation to AH Plus sealer. Materials and methods: A total of eighty-eight extracted human single-rooted teeth with single straight root canals were selected for this study. The samples were randomly allocated into four groups (n=22) according to the type of sealer used and the temperature of warming gutta-percha; (AH Plus/ 150{u00BA}C), (AH Plus/200{u00BA}C), (TotalFill BC/150{u00BA}C) and (TotalFill BC/200{u00BA}C) groups. The roots were sectioned horizontally into 2 mm. thick slices, and the bond strengths were measured using a standardized push-out test. The mode of failure was examined by visual inspection under stereomicroscope. Before the push-out test, five representative samples from each group were randomly selected to qualitatively assess the interfacial adaptation using environmental scanning electron microscopy (ESEM). Results: The mean push-out bond strength values of the two sealers recorded significant lower values at 150{u00B0}C than at 200{u00B0}C. The predominant mode of failure among groups was adhesive failure, except for TotalFill BC/200{u00BA}C group that showed mostly mixed failure. Regarding the interfacial adaptation, the mean gap width measurement at 150{u00B0}C was wider than that at 200{u00B0}C for both sealers. Conclusions: Using 150{u00B0}C during CWC technique compared to 200{u00B0}C significantly decrease the bond strength values and the interfacial adaptation of TotalFill BC sealer as well as AH Plus sealer |