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Öğe Comparison of marginal and internal adaptation of three-unit fixed dental prostheses made using CAD/CAM metal-free materials(Wiley, 2022) Baran, Melike Cigdem; Demirci, Fatih; Tuzlali, MesutThe aim of this study was to compare the marginal and internal adaptation of three-unit fixed dental prostheses (FDPs) fabricated from different metal-free materials using CAD/CAM methods. A total of 100 three-unit FDPs were produced from a cubic zirconia, a fiber-reinforced resin composite, a polyetheretherketone (PEEK), a polyetherketoneketone (PEKK), and a polymer composite material by the CAD/CAM method (n = 20 per material). The zirconia group was considered the control/reference material. Marginal and internal gap values of the produced FDPs were measured using the silicone replica method at x40 magnification under a stereomicroscope. The obtained data were analyzed using one-way ANOVA and Tukey's HSD tests. The marginal and internal gap values for the cubic zirconia material were found to be statistically significantly lower than those seen for the PEEK, polymer composite, PEKK, and fiber-reinforced resin composite materials. While the marginal and internal adaptation of the cubic zirconia material was found to be better than the others, it should be noted that the marginal and internal gap values for all other materials tested were found to be within the clinically acceptable range.Öğe Mechanical analysis of three-unit metal-free fixed dental prostheses produced in different materials with CAD/CAM technology(Springer Heidelberg, 2022) Demirci, Fatih; Bahce, Erkan; Baran, Melike CigdemObjectives The aim of this study was to evaluate the mechanical analysis of different three-unit metal-free fixed dental prostheses (FDPs) produced by computer-aided design (CAD)/computer-aided manufacturing (CAM). Materials and methods A hundred stainless steel die models of a mandibular left first premolar and a mandibular left first molar were prepared. The specimens were divided into five CAD/CAM material groups (n = 20): Group ZIR, a cubic zirconia (DD cube ONE (R)); Group FRC, FRC resin material (Trinia); Group PEEK, a PEEK material (KERA (R) starPEEK); Group PEKK, a PEKK material (Pekkton (R) ivory); and Group COMP, a polymer composite material (BreCAM.HIPC). Compression test was applied to the specimens, and then the results were analyzed statistically using one-way ANOVA and Tukey's tests. In addition, deformation analyses in FDPs were compared with finite element method (FEM). After the compression test, the damage to FDPs was evaluated with a scanning electron microscopy. Results Although ZIR (2461 +/- 93.70 N) showed high fracture load values, FRC (1571 +/- 35.96 N) material was found to be advantageous in terms of toughness. These were followed by PEEK (1398 +/- 38.26 N), PEKK (1227 +/- 44.25 N), and COMP (829 +/- 32.33 N), respectively. A ductile fracture was observed in PEEK, PEKK, and FRC due to their elastic structures. The deformation properties examined by the FEM were found to be similar to the compression test. Conclusions CAD/CAM high-performance polymers and cubic zirconia material can be used in three-unit FDPs. In three-unit FDPs, the use of FRC material can be advantageous due to both biomechanics and lightness.