Evaluation of Push Out Bond Strength of Two Calcium Silicate Based Cements with Bone Cement in Retrograde Cavities Prepared by Ultrasonic Retro Tips

ABSTRACT

Introduction: Surgical endodontic treatment comprises ofthorough debridement of pathological periradicular tissue,root end resection followed by a Class I retrograde cavitypreparation and insertion of root end filling material into theprepared cavity. The aim of this study was to evaluate the pushout bond strength of Biodentine, Mineral Trioxide Aggregate(MTA) and Bone Cement used in the retro cavities, preparedwith ultrasonic retro tips.Material and methods: 60 human extracted single rootedteeth were selected and sectioned with a diamond disc (Horico,Germany) to standardize the root length of 15mm. The rootswere instrumented with rotary ProTaper Universal (DentsplyMaillefer) system till size F2. The root canals were obturatedusing gutta percha (Dentsply, Maillefer) and AH Plus sealer(Dentsply, Germany). 3mm of root end resection wasperformed with high speed hand piece under water coolant.3mm deep retro cavities were prepared with ultrasonic stainlesssteel retro tip (Woodpecker). All the specimens were dividedinto 3 groups (n=20) Group I MTA (ProRoot, Tulsa Dental,USA), Group II Biodentine (Septodont, France), Group IIIBone Cement (Depuy, Johnsons and Johnsons). Each materialwas mixed according to the manufacturers instructions andfilled into the retro cavities. The specimens were sectionedperpendicularly to obtain 1mm thick slices from the apicalportion and subjected to push out bond strength testing underUniversal Testing Machine (Instron).Results: Biodentine showed more push out bond strength thanMTA and Bone Cement. There was no significant differencebetween MTA and Bone Cement groups.Conclusion: Bone Cement can be considered as one of thepotential retro filling material.