The coronal segment of Group 2 (AA + Silane) specimens established the maximum PBS scores.

The apical third of GFPs pretreated in Radachlorin (PDT) + Silane revealed the minimum outcomes of bond integrity.

Samples from Group 4 (Radachlorin (PDT) + Silane) were found to have the lowest Ra.

Assessing the effects of various surface conditioners (Air abrasion (AA), Nd: YAG laser, and radachlorin mediated photodynamic therapy (PDT) on the average surface roughness (Ra) and push out bond strength (PBS) of glass fiber post (GFP) bonded to root dentin

Sixty-four extracted human incisors were obtained from outpatient department and root canal treatment was performed. Post space was prepared, and samples were distributed into 4 groups based on the type of surface conditioning of the post (n = 16). Group 1 (H2O2 + S), Group 2 (AA + S), Group 3 (Nd: YAG laser + S), and Group 4 (Radachlorin mediated PDT + S). Ra (n = 5) and topographic analysis (n = 1) of the post following conditioning were performed using a profilometer and scanning electron microscope. The remaining preconditioned fiber post was bonded to the post space using resin cement (n = 10). A universal testing machine and Stereomicroscope were used for PBS and failure mode assessment. The data were analyzed using the Tukey test and analysis of variance for further comparisons (p = 0.05)

Group 2 (AA) pretreated discs showcased the highest average Ra (1023.34 ± 0.033 µm) and maximum PBS (11.92 ± 0.17 MPa, Middle: 11.78 ± 0.10 MPa, Apical: 10.32 ± 0.31 MPa). In contrast, samples from Group 4 (Radachlorin (PDT) + Silane) were found to have the lowest roughness (799.65 ± ± 0.076 µm) and minimum bond strength (Cervical: 8.99 ± 0.43 MPa, Middle: 8.76 ± 0.52 MPa, Apical: 7.22 ± 0.21 MPa)

Air abrasion and Nd: YAG laser can be used as a suitable substitute for a chemical surface conditioner on GFP as they exhibited comparable Ra and bond integrity of fiber post-conditioned with H2O2.

Air abrasion

Radachlorin

Push-out bond strength

Glass fiber post

Photodynamic therapy

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