HIGHLIGHTSPOBT in endodontic research predicts the clinical behavior of endodontic material s .
Introduction : There is limited literature on the impact of testing variables on the push‐out bond test ( POBT ) .
This review identified design s of the POBT used in the endodontic literature and aim ed to determine which experimental variables may influence the push‐out bond strength ( POBS ) .
Effect of plunger diameter on the push-out bond values of different root filling materials.
AIMS To evaluate the effect of plunger diameter on the push-out bond strength of different root filling material s to root canal dentine . METHODOLOGY Freshly extracted human incisors ( n=90 ) were decoronated , and the root canals were enlarged with post drills . Prepared roots were placed into a custom alignment apparatus to embed the roots vertically within self-curing acrylic resin . The specimens were r and omly assigned into three groups according to the root filling system used : gutta-percha/AH Plus ; Resilon/Epiphany ; and fibre-reinforced composite (FRC)/Duolink resin cement . After filling , the specimens were further subdivided according to the diameter of the plunger used to employ the debonding force : 0.75 , 1 and 1.25 mm . Intra-radicular bond strength was measured using the push-out test at a cross-head speed of 1 mm min(-1 ) . The data were analysed statistically using Kruskal-Wallis test with Bonferroni correction at P = 0.05 . RESULTS Regardless of the plunger diameter , FRC yielded the highest bond strength , followed by gutta-percha and Resilon , respectively ( P<0.001 ) . In all groups , greater plunger diameter result ed in an apparent increased bond strength , but the differences were only significant in the FRC group , with the 1.25-mm plunger generating higher debonding values compared with that of its 0.75- and 1-mm versions ( P<0.001 ) . In the gutta-percha and Resilon groups , the majority of specimens had adhesive failures . Roots filled with FRC exhibited more cohesive failures than those of the other test groups . CONCLUSIONS Different plunger diameters are associated with significantly different intra-radicular push-out bond strengths of root filling systems
HIGHLIGHTSPOBT in endodontic research predicts the clinical behavior of endodontic material s .
Introduction : There is limited literature on the impact of testing variables on the push‐out bond test ( POBT ) .
This review identified design s of the POBT used in the endodontic literature and aim ed to determine which experimental variables may influence the push‐out bond strength ( POBS ) .