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Öğe Effect of Plastic Impression-Transfer Copings on the Dimensional Accuracy of Implant Impressions(Cumhuriyet University Faculty of Dentistry, 2023) Coşkun, Akın; Koyu, Tuğçe; Yeşilyurt, Gizem; Ülgey, Melih; Görler, OğuzhanObjective: The purpose of this in vitro study was to evaluate the effect of plastic impression-transfer copings on the dimensional accuracy of close tray implant impressions. Material and Methods: A master model consisting of acrylic main material was created. Five parallel holes were drilled for the analogs. Special measuring spoons were prepared for the models created with self-hardening polymethyl methacrylate resin. Our research consisted of 2 groups. The first group consisted of five parts and the impression was taken using the Implant Plastic impression-transfer part coping method. The second group, on the other hand, consists of five parts, and this time measurements were taken without using the Plastic impression-transfer coping method. Vinylpolysiloxane impression material was used for both groups. At the end of the impression process, plaster models were made with type IV calculus. The plaster models were scanned with laboratory-type scanner and recorded in the measurement program. To create a standard operation between the groups, measurements were made of each analog from a certain reference point. Measurement results were recorded in millimeters and pairwise comparisons were made using Welch's t-test analysis. Results: How the plastic impression caps affect the measures was concluded by applying the t-test to each point. The deterioration in the measurements taken with the cap was lower for all distances compared to the measurements taken without the cap, but the difference was not significant (p>0.05). Conclusions: While the distortions seen in the right and left measured intervals were found as the expansion type, the distortions in the posterior and anterior intervals were determined as the compression type. Although there are dimensional changes in the measurements taken without the use of a cap, the findings were not found to be clinically significant. © 2023.Öğe Effect of Repair and Thermal Cycling on The Flexural Strength of Denture Base Materials Fabricated from Different Methods(Cumhuriyet University Faculty of Dentistry, 2023) Tuğut, Faik; Koyu, TuğçeObjectives: The aim of this study was to evaluate the flexural strength of the denture base materials produced by different methods after repair and was to evaluate effect of thermal aging. Materials and Methods: A total of 120 specimens were fabricated by conventional, CAD/CAM milled, and 3D-printed denture base materials for this in vitro study. Specimens were divided into four groups; non-repaired groups (N), repaired groups (R), non-repaired-aged groups (N-aged), and repaired-aged (R-aged) groups. In N groups, specimens were stored in the water bath for 24 h before the flexural strength test. In N-aged groups, samples were subjected to thermal aging for 5000 cycles, then tested. For repaired R groups, samples were repaired with auto-polymerized acrylic resin and storage in the water bath for 24 h then tested. For the R-aged groups, samples were repaired with auto-polymerized acrylic resin, aged for 5000 cycles, then tested. Specimens were performed a three-point loading test using a universal testing machine. Data were analyzed using Wilcoxon and Kruskal-Wallis tests. Results: When the groups were compared with each other, the difference between all groups was found to be statistically significant (p<0.05). Regardless of the thermal cycling process, in N groups, the highest flexural strength was recorded in N-CAD group (92.53±6.52 MPa), the lowest flexural strength was recorded in N-3D group (33.72±2.74 MPa). Regardless of the thermal cycling process, in R groups, the highest flexural strength was recorded in R-C groups (31.80±5.86 MPa) and the lowest flexural strength was recorded in R-3D groups (8.37±1.20 MPa). Thermal cycling and repair process showed a decreasing effect on flexural strength in all groups. Conclusions: The ideal flexural strength among denture base materials was found in CAD/CAM milled denture base materials. © This work is licensed under Creative Commons Attribution 4.0 International LicenseÖğe Farklı materyallerden üretilen tarama gövdelerine uygulanan sterilizasyon ve torklama işlemlerinin dijital ölçü sonuçlarına etkisinin araştırılması(Sivas Cumhuriyet Üniversitesi, 2023) Koyu, Tuğçe; Demir, HakanDaha sonra doldurulacaktır
