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    Fracture strength of endodontically treated teeth restored with different fiber post and core systems
    (Springer, 2020) Ozyurek, Taha; Topkara, Can; Kocak, Imran; Yilmaz, Koray; Gundogar, Mustafa; Uslu, Gulsah
    The aim of this study was to investigate the effects of different post and core systems, CAD/CAM crown placement on fracture strength of endodontically treated mandibular premolar teeth. One hundred forty single-rooted premolar teeth were randomly divided into a control group and six experimental groups as follows: control group (Group 1); FiberSite post luting with Clearfil DC Core Plus (Group 2); RelyX Fiber post luting and core build up with Clearfil DC Core Plus (Group 3); RelyX Fiber post luting with Clearfil DC Core Plus and core build up with Filtek Bulk Fill Posterior (Group 4); specimens that received CAD/CAM crowns after the same procedures performed in Groups 2, 3, and 4, respectively (Groups 5, 6, and 7). Fracture strength tests were performed, and the failure modes were recorded. Data were statistically analyzed using one-way ANOVA and post hoc Tukey tests. The highest fracture resistance was observed in the control group and among the experimental groups in Group 4. Groups 3 and 5 showed similar fracture resistance followed by Group 2. The lowest fracture resistances were seen in the samples of Groups 6 and 7. While the fracture strength of Group 2 increased after the crown placement (Group 5), the fracture strength of Group 3 and Group 4 decreased (P < 0.05). While the specimens in Groups 1, 2, 3, and 4 predominantly showed favorable failure, unfavorable failure was more frequent in Groups 5, 6, and 7.
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    Pull-out Retentive Resistance of Fiber Posts Restored with Different Core Materials
    (Galenos Publ House, 2022) Topkara, Can; Yilmaz, Koray; Gundogar, Mustafa; Uslu, Gulsah; Ozyurek, Taha
    Objective: This study aimed to assess the pull-out bonding resistance of FiberSite and RelyX Fiber posts constructed from core structures using various resin cement. Materials and Methods: Sixty mandibular premolar teeth were horizontally sectioned to create a root canal length of 15 +/- 1 mm. Up to size #40, samples were prepared and obturated with gutta-percha and root canal sealer. Three groups of specimens (n=20) were formed. FiberSite posts were luted and built-up using Clearfil DC Core Plus in Group 1, RelyX Fiber posts were luted and built-up using Clearfil DC Core Plus in Group 2, and RelyX Fiber Posts were luted and built-up using Filtek Bulk Fill Posterior in Group 3. Each specimen was vertically positioned in a universal testing machine and rotated at 0.5 mm/min until it dislodged. Oneway ANOVA and post hoc tests were used to evaluate the data. Results: The bonding strength of FiberSite posts was higher than that of RelyX Fiber posts (p<0.05). Clearfil DC Core Plus-built RelyX Fiber Posts exhibited higher bond strength than Filtek Bulk Fill Posterior-built posts (p<0.05). Conclusion: FiberSite posts provide better root canal dentin retention than RelyX Fiber posts with different core materials.