The influence of ultrasound on removal of prefabricated metal post cemented with different resin cements.

摘要: Background: Ultrasonic vibrations are used to remove a cemented post from root canal requiring endodontic retreatment. Various results have been reported the studies that evaluated effect of ultrasonic instruments in removing posts with resin cements. The aim this study was evaluate energy on retention prefabricated metal Panavia or Maxcem Elite Materials and Methods: In vitro study, forty eight extracted single premolars were decoronated diamond disc leaving 13 mm long endodontically treated. canals obturated by gutta-percha up 5 vertical condensation method 8 post-space prepared receive no. 2 Dentorama post. roots placed an incubator for 48 h 37°C 100% humidity. After mounting teeth acrylic blocks, using F2.0 24 specimens others. For half each subgroup, device applied 4 min. Universal testing machine measure force needed crosshead speed 1 mm/min until came out canal. Kruskal-Wallis test statistical analysis at 5% level significance. Results: removal not significantly different among groups ( P > 0.05). Conclusion: did decrease Furthermore, it seems there is no significant difference between self-etch (Panavia) self-adhesive (Maxcem Elite) Key Words: Post removal, post, cement, ultrasound