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    Comparison of the Load-bearing Capacities of Monolithic PEEK, Zirconia and Hybrid Ceramic Molar Crowns
    (Galenos Yayincilik, 2019) Tartuk, Bulent Kadir; Ayna, Emrah; Basaran, Emine Goncu
    Objective: Although polyether ether ketone (PEEK) shows high biocompatibility in prosthetic dentistry, there is inadequate information about its clinical applications and limits. The purpose of this study was to compare the load-bearing capacities of PEEK, hybrid ceramic and zirconia crowns, which were fabricated using computer-aided design and computer-aided manufacturing (CAD/CAM). Materials and Methods: Three groups (n=10) of high-resistance PEEK polymer, hybrid ceramic and zirconia were fabricated using CAD/CAM. A universal test machine was used to assume the fracture resistance of all specimens. The specimens were loaded until final fracture occurred and load at fracture was recorded. Fracture resistance data were statistically analyzed by Tukey honest significant difference multiple comparison test. Results: There was no significant statistical difference between PEEK group (2214 +/- 236 N) and hybrid ceramic group (2325 +/- 264 N) in relation to the load-bearing capacities (p>0.05), while zirconia group (3292 +/- 192 N) showed the highest values for fracture load. Conclusion: All three crown materials were successful against physiological occlusal forces. Regarding the limitations of this in vitro study, PEEK could be an alternative crown material for fixed dental prostheses.
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    Öğe
    Evaluation of the Internal Accuracy of Molar Crowns Fabricated Using Digital and Conventional Impression Techniques
    (Galenos Yayincilik, 2018) Tartuk, Bulent Kadir; Ayna, Emrah; Basaran, Emine Goncu
    Objective: The purpose of this in vitro study was to compare the internal gaps of 3 different full molar crowns prepared using digital and conventional impression techniques. Materials and Methods: A zirconia model with a prepared maxillary first molar was used as the base model. Sixty crown restorations were produced using zirconia, polyether ether ketone and hybrid ceramic from the same datasets. The specimens divided into 2 groups that were fabricated as follows: for the group conventional impression (CZ; CP; CH, n=10), vinyl siloxane ether impressions of the master model were made. For the group digital impression (DZ; DP; DH, n=10), digital impressions of the master model using intraoral scanner system were made. The internal accuracy of the frameworks were measured under a reflected stereo microscope by using the silicon replica technique. ANOVA and the Tukey-HSD multiple comparison tests were used. Results: There was no significant statistical difference between the conventional and digital impression techniques in relation to the internal fit (p>0.05). Group DH (81.74 mu m) showed the lowest values for internal fit, while group CZ (102.2 mu m) showed the largest. Conclusion: Within the limitations of this in vitro study, it was concluded that the marginal fit produced by the digital and conventional impression techniques showed the same values, and all the samples were measured at a clinically acceptable internal fit (<200 mu m).