Hossein Soraghi, Elnaz Shafigh, Mahdi Allahdadi, Mahdieh Jamshidian
Objective: In recent years, due to the increasing of demand for tooth-colored posts, conventional metal posts have switched to various non-metallic posts, including fiber posts. Resistance to post-fiber displacement depends on their adhesion to the dentin. For fiber post cementation, self-etch, self-adhesive resin and glass ionomer cements are some of cementation materials that commonly used. the aim of this study was to compare the push-out straight between glass ionomer, self-etch and self-adhesive cements in fiber posts. Method: For this study, 30 extracted central teeth that have a similar anatomical structure and do not have structural problems and caries was used. the root canal for each specimen was prepared and the teeth were randomly divided into 3 groups (self-adhesive, self-etch and glass) (n=10) according to the cementation system. The specimens were then sectioned with dentistry disc (3 incisions in 3 sections of 1and 5 and 8 mm from the cervical region). The samples were then sent to a push-out test in a test machine at a speed of 0.5 mm / min and a load of 5 KN. The experiment was continued until the fiber post was completely separated from the root canal and finally, the push-out bond strength assessment (in MPa) was calculated. To compare the push out bond strength between the three groups, ANOVA statistical test with Tukey supplementary test in SPSS software version 25 was used. Data were reported as mean ± SEM and P˂0.05 was considered significant. Results: The amount of push-out bond strength , in contrast to the coronal section, which showed no significant difference between the three groups, in the middle and apical sections, the two groups of self-adhesive and selfetch, had a significant increase compared to ionomer glass. Despite this higher value in the self-adhesive group than the self-etch in the middle and apical sections, there was no significant difference. In all three groups, the push-out bond values of strength in the apical section were significantly higher than the middle section and also, the middle sections were significantly increased compared to the coronal section. Conclusion: According to this study, it seems that self-adhesive cement has a reliable bond strength for the use of fiber post in endodontically treated teeth and despite its easier clinical application, it is recommended for clinical use. However, this statement needs further study