Effect of 940-nm Diode Laser Power on the Bond Strength of Fiber Posts to Root Canal Dentin

The retention of fiber posts is reliant upon the successful adhesion of resin cement to root canal dentin. Laser-assisted treatment may modify the dentin surface and influence post bond strength; however, the impact of various power settings of a 940-nm diode laser requires further investigation. The objective of this study was to assess the effectiveness of different 940-nm diode laser powers on fiber post retention. Thirty extracted premolars have been sorted into three groups (n = 10): 1.2-W laser, 2-W laser, and control. Fiber posts have been retained using dual-cure resin cement and pull-out force was recorded using a universal testing machine. Data were analyzed using non-parametric tests. Significant differences were found between all groups (p < 0.001). Median pull-out forces were 93 N, 79 N, and 72 N for the 1.2-W, 2-W, and control groups, respectively. All pairwise comparisons were significant (p < 0.001). Both laser-treated groups showed higher median post retention than the control, with the 1.2-W group showing the highest median value.