Post surface conditioning via air abrasion, Nd: YAG laser and Radachlorin activated Photodynamic therapy on surface roughness, surface topography, and bond strength to root dentin

Abstract

Aims

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

Methodology

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)

Results

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)

Conclusion

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.