Effect of diode laser irradiation on push-out bond strength of fiber post to root dentin using two different resin...

This study aimed to assess the effect of diode laser irradiation on pushout bond strength (PBS) of fiber post to root dentin using different resin cements.

This in vitro experimental study utilized 36 extracted single-rooted mandibular premolars. The samples underwent decoronation, root canal treatment, and post space preparation. Teeth were randomly assigned to four groups (n = 9 each): ((I) etch-and-rinse (ER) adhesive system and conventional resin cement, (II) diode laser irradiation (for simulated antimicrobial disinfection) + ER cement, (III) self-adhesive (SA) cement, and (IV) diode laser irradiation + SA cement. After 10,000 thermocycles (5-55 °C), PBS was measured using a universal testing machine (Zwick/Roll, Ulm, Germany) at 0.5 mm/min until failure. Cement-dentin interface morphology was qualitatively assessed via scanning electron microscopy (SEM; MIRA3 TESCAN, Czech Republic) on one specimen per group. Data were analyzed using one-way ANOVA and Bonferroni post-hoc tests (α = 0.05).

Significant differences in PBS were observed among groups (P < 0.001). Mean ± SD PBS values were: ER cement, 5.61 ± 1.47 MPa; diode laser + ER cement, 5.75 ± 0.88 MPa; SA cement, 7.75 ± 0.55 MPa; diode laser + SA cement, 7.60 ± 0.97 MPa. Pairwise comparisons showed SA cement groups had significantly higher PBS than ER cement groups (P < 0.001 for both). Diode laser irradiation had no significant effect within cement types (P > 0.05).

Resin cement type significantly influenced PBS, with SA cement outperforming ER cement. Diode laser irradiation had no significant effect on PBS.