الفهرس 
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Abstract
Aim: To evaluate the effect of laser surface treatment of both canal walls and glass fiber posts on
their bond strength.
Materials and Methods: Forty extracted single-rooted permanent human teeth were decoronated
and endodontically treated. Post space of 10 mm length was prepared to receive glass fiber post. Teeth
were randomly divided into 4 groups based on the surface treatment used as follows; group ACC
(Control): post space was irrigated using standard irrigation protocol (5 ml 5.25% NaOCl+10 ml
distilled water+5 ml of 17% EDTA+10 ml distilled water) and post surface received conventional
silane treatment, group BLC: post space was irradiated with Er:YAG laser and post surface received
conventional silane treatment, group CCL: post space was irrigated using standard irrigation protocol
and post surface was treated with Er:YAG laser followed by silane application, group DLL: both
tooth and post received laser treatment. The posts were then cemented with self-adhesive resin
cement. Three slices were prepared for each sample and push-out test was done using a universal
testing machine at a crosshead speed of 1 mm/min.
Results: Statistical analysis showed that, regarding different root levels: all groups showed
insignificant difference between all sections (P > 0.05) except group ACC, in which the middle section
showed significantly higher bond strength value than cervical (P < 0.05). When comparing all groups
together, there was no significant difference between all groups in the middle section, while in
cervical and apical sections, all the groups tested showed a statistically significant difference, as group
DLL was the highest (17.15 ± 3.31), group ACC was the lowest (12.47 ± 2.17), with no significant
difference between group BLC and group CCL.
Conclusion: Er:YAG laser treatment for both tooth and post can be used as an alternative method to
enhance the bond strength of adhesively luted glass fiber post compared to conventional treatment.
Keywords: Bond strength, Er:YAG laser, Glass fiber post, push-out test, Smear layer, Surface
treatment, Resin cement, Standard irrigation.