Nd: YVO₄ Laser versus Hydrogen Peroxide for Glass Fiber Post Conditioning: Comparative Analysis of Bond Strength and Surface Roughness with Self-Adhesive and Conventional Dual-Cure Resin Cements

Abstract

Objectives: To evaluate the effects of various surface conditioners, hydrogen peroxide (H₂O₂+Silane) and neodymium-doped yttrium orthovanadate (Nd: YVO4 laser + Silane) on the push out bond strength (PBS) and surface roughness (Ra)of glass fiber post (GFPs) bonded to root dentin using self-adhesive dual cure resin cement (SADCRC) and conventional dual cure resin cement (CDCRC).

Methodology: The present study was approved by King Abdulaziz University. Sixty single-rooted premolars were decoronated. Root canal preparation was initiated, and mechanical preparation was performed, followed by obturation. Post space was prepared using a Peeso reamer. Seventy-five GFPs were split into three groups based on the conditioning regime (n=25): Group 1, No conditioning, Group 2 (H₂O₂+Silane), and Group 3 (Nd: YVO4 laser + Silane). The profilometer measured Ra on five GFP. According to the type of resin cement used, twenty GFPs from each group were again split into subgroups A and B. PBS was assessed using a universal testing machine, and failure mode analysis was performed using a stereomicroscope. ANOVA and post hoc Tukey test were used to identify that the tested groups were statistically significant (p<0.05).

Results: The highest Ra (1.32 ± 0.22 µm) was observed in Group 2 (Nd: YVO₄ laser) samples. Whereas Group 1 (Control) had the lowest Ra (0.43 ± 0.11 µm). The cervical third of Group 3A (Nd: YVO4 laser Silane + CDCRC) (11.26±1.17 MPa) displayed the highest bond strength outcome. Whereas, the apical third of Group 1A (No conditioning- Silane+CDCRC) (3.78±0.21 MPa) exhibited the lowest bond strength.

Conclusion: A neodymium-doped yttrium orthovanadate laser can be a suitable alternative to Hydrogen peroxide. Self-adhesive resin cement exhibited satisfactory performance in all three thirds of the canal.