Effect of intra - orifice barriers on the fracture resistance of endodontically treated teeth - An Ex-Vivo study.

Introduction:-The study investigated and compared the root reinforcement potential of dual cure cement (Luxacore Z - Dual Automix, DMG], light cure glass ionomer cement (GC Light cure GIC), and nano hybrid flowable composite (Tetric-N-Flow, IvoclarVivadent) placed over root canals obturated with gutta-percha and AH plus sealer as intra-orifice barriers. Materials and methods:-Fourty freshly extracted mandibular premolars were instrumented and obturated with corresponding guttapercha cones and AH plus sealer. Except for control group, the coronal 3 mm of root fillings of all other group specimens were removed and randomly divided into 4 groups of 10 specimens each. They were control group (no barrier), dual cure cement, light cure glass ionomercement andnano hybrid flowable composite. After 8 hours, all the groups were subjected to fracture resistance testing by using Universal testing machine. Results:-The fracture resistance testing results obtained showed the following pattern - dual cure cement > light cure glass ionomer cement >nano hybrid flowable composite > Control group. Conclusion:-The placement of an intra-orifice barrier can be regarded as beneficial for the reinforcement of an endodontically treated teeth. [ABSTRACT FROM AUTHOR]