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Purpose: The purpose of this original research is to evaluate the effect of the use of Er:YAG laser on the root walls on the push-out connectivity of zirconium poses prepared with the technology of Computer Assisted Design/Computer Assisted Production (CAD/CAM) specifically on the post spaces opened in the oval root channels. Tools and Methods: The study included 40 teeth with oval root channel configuration, selected as a result of the radiological examination. After the completion of the root channel treatment, the post empty with ultrasound ends was prepared. Examples were randomly divided into two groups (n=20) according to whether the post emptiness was applied to the walls of Er:YAG or not. With the scan of the post empty for each sample with the freeze device with the exfoliation method, yttria stabilized tetragonal zirconium polikristal (Y-TZP) blocks produced zirconium posters. Posts were signed after signing. Push-out connection test was implemented and the data obtained was statistically evaluated using the chi-square test with the t-test. Results: The group’s push-out connectivity values, which have been made with the Er:YAG laser application to the root channel walls, have been found significantly higher compared to the non-laser group (p<0.05). Result: Radicular dentine Er:YAG laser application has increased push-out connection values. The Effect of Er:YAG Laser Preatreatment of Radicular Dentin on the Push-out Bond Strength of CAD/CAM Fabricated Milled Zirconia Posts in Oval Root Canals Abstract Aim: This original research study aimed to evaluate the effect of Er:YAG laser irradiation of post spaces prepared in oval root canals on the push-out bond strenght of zirconia posts manufactured by Computer Aided Design / Computer Aided Manufacturing (CAD/CAM) technology. Materials and methods: Forty teeth showing oval root channel configuration were included to the study following the radiological examination. Post spaces were prepared with ultrasonic tips after the completion of root channel treatment. Specimens were divided into two groups randomly either they were irradiated with Er:YAG lasers or not (n=20). For each specimen, zirconium posts were produced by milling from yttria-tetragonal zirconia polycrystal (Y-TZP) blocks. Posts were syntered and luted in the post spaces of specimens. Push-out bond strenght test was performed and data was statistically analyzed using t-test and chi-square test. Results: The push-out bond strenght values of the group, which specimens were irradiated with Er:YAG laser were significantly higher when compared to non-lased group (p<0.05). Conclusion: Er:YAG laser pretreatment of radicular dentin improved the push-out bond strenght values. Key Words: Endodontics, dental restoration, zirconium posts, Er:YAG laser

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