The aim of this study was to investigate the results and contributions of surface treatments with different laser systems on bond strength of resin cement with aesthetic post system made of different materials.
Material and Methods: 3 different aesthetic post systems (RelyXTM fiber post, C-Post® zirconium oxide post, Easy Post TM zirconia reinforced fiber post), including 40 from each, were used. On these posts, 3 different surface treatments (Er:YAG laser, Nd:YAG laser and Femtosecond (Fs) laser), including 10 pieces from each system, were applied. In the remaining 10 samples, no action was taken, and a control group was created. The obtained posts were cemented into the composite post slots of 12 mm length and 4 mm diameter using self-adhesive resin cement (RelyXTM U200). From the coronal, medial and apical regions of each prepared sample, 2 mm-thick sections were taken to make push-out tests. Afterward, the push-out resistance was measured using a universal testing machine with 0.5 mm/min head speed.
Results: There were statistically significant differences between the glass fiber posts and the zirconium-reinforced glass fiber posts with zirconium posts (p<0.05). The zirconium posts had lower bond strength values. Regarding the etching procedures conducted on the zirconium posts, the Fs lasers and Nd: YAG lasers were found to be more effective (p<0.05).
Conclusion: Surface treatments may be applied for increasing the bond strength of zirconium oxide posts, which have lower bond strength than glass fiber posts. Surface treatments conducted with Nd:YAG and Fs lasers increase the value of bond strength of zirconium posts.