Effect of bonding pericervical dentin with reinforcing materials on strength of root-filled mandibular single-canal premolars: An in vitro study

The present study examined the effect of bonding the pericervical dentin using resin-modified glass-ionomer cement (RMGIC), nanohybrid composite (Endure Nano), and Biodentine on the fracture resistance of root-filled mandibular premolars. Twenty-four human single-rooted mandibular premolars were decoronated, cleaned, and shaped with ProTaper Universal till size F3. The roots were obturated with gutta-percha using a single-cone technique. The teeth were randomly grouped into four groups of n = 6 each. After removing the 3 mm coronal gutta-percha in Groups I, II, and III, the intra-orifice barriers of RMGIC, nanohybrid composite (Endure Nano), and Biodentine were placed, respectively. Group IV served as the control. The fracture resistance of the specimens was analyzed using the universal testing machine. The derived data were statistically evaluated using one-way ANOVA and post hoc Tukey’s honestly significant difference test. A significantly high fracture strength was exhibited by specimens of Group I, followed by Groups II and III, respectively. The lowest fracture strength was shown by the control group. Within the limitation of the present study, the fracture resistance of an endodontically treated tooth was significantly influenced by the type of intra-orifice barrier.