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 ) .
Micropush-out dentine bond strength of a new gutta-percha and niobium phosphate glass composite.
AIM To characterize an experimental gutta-percha and niobium phosphate glass composite ( GNB ) applied with a thermoplastic technique to the root canals without sealer in a moist environment and to evaluate its micropush-out bond strength to root canal wall dentine . METHODOLOGY The root canals of sixty human m and ibular pre-molars were prepared using rotary NiTi instruments and irrigation with sodium hypochlorite and EDTA . The teeth were then r and omly divided into three groups according to the root filling material used : AH plus sealer and gutta-percha ( AH ) , EndoSequence BC gutta-percha without sealer ( GBC ) , and GNB without sealer . The root canals were filled with a single cone using warm vertical condensation . Push-out bond strengths associated with the filling material s in slices from middle root thirds was determined 30 days after root filling . The failure mode was analyzed with SEM . Analysis using EDX and SEM-EDS was carried out to verify the composition and distribution of the particles of the tested material s. Data were statistically analyzed by one-way anova and Tukey 's test ( P < 0.05 ) . RESULTS AH and GNB groups had bond strengths of 2.83 ± 0.64 MPa and 2.68 ± 0.84 MPa , respectively , with no significant difference between them ( P > 0.05 ) . The GBC group had the lowest mean bond strength ( 1.34 ± 0.42 MPa ) , which was significantly different compared with the other groups ( P < 0.05 ) . Cohesive failures prevailed in the AH group , whereas failures were mixed in the GBC and GNB groups . The SEM-EDS analysis on the surface and in the bulk of GBC revealed only a superficial coating of bioceramic particles . Glass particles were detected both on the surface and in the bulk of GNB . CONCLUSIONS The experimental root filling composite ( GNB ) had an ability to adhere to root canal wall dentine equal to the current gold st and ard root filling with gutta-percha and sealer ( AH Plus )
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 ) .