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Purpose: In this study, the impact of the boundary finish and substructure shapes on the breakdown resistance of venous porcelans on the various substructure of zirconium has been studied in vitro. Tool and Method: Examples will be obtained with cut up top 1. small teeth representative drives; 1. Anatomic oklusal surface with 6 mm coron length and 1 mm shoulder stairs in 60 taper angles, 2. Anatomic oklusal surface with 6 mm coron length and 1 mm chamber stairs in 60 taper angles, 3. The shell; 6 mm coron length and 60 taper angles, 1 mm shoulder stairs with a flat oklusal surface, 4. The curve; 6 mm curve length and 60 taper angles with 1 mm shamfer staircase is prepared in the CNC turning factory in order to provide standardization as a flat oklusal surface. 60 pieces of epoxy resin drive have been obtained from the measurements taken from the moulds. Zirconium substructs have been prepared with different methods after the corons are completed by applying the upper structure porcelan. After the curons were simulated on the epoxy resin drives, the breakdown resistance of venereal porselenes was identified in the Universal test device. Results: The data is evaluated by the Triangular Variance Analysis (ANOVA). It is statistically identified that the interaction between the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape. The highest venus porselen break-resistance values are found in the anatomically prepared chamber-stage White Peaks curons, while the lowest break-resistance values are found in the chamber-stage Lava curons that are prepared straight. Keywords: sub-structure shape, edge finish shape, breakdown resistance, zirconium sub-structure. Effect of different marginal finish lines and coping designs on the fracture resistance of veneering porcelain on various zirconia frameworks ABSTRACT Aim: In this in vitro study, the effect of finish line and coping design on the fracture resistance of veneer porcelains on the zirconia frameworks prepared through various methods was analyzed. Material and Methods: To standardization, the dies representing the upper first premolar tooth were prepared in the CNC turning machine as: the first die; with a 6 mm crown length and at 60 taper angle, having an anatomic occlusal surface with a 1 mm shoulder line, the second die; with a 6 mm crown length and at 60 taper angle, having an anatomic occlusal surface with a 1 mm chamfer line, the third die; with a 6 mm crown length and at 60 taper angle, having a flat occlusal surface with a 1 mm shoulder line, and the fourth die; with a 6 mm crown length and at 60 taper angle, having a 1 mm chamfer line with a flat occlusal surface. 60 pieces of epoxy resin dies were obtained from the measurements taken from the dies. Zirconia frameworks had been prepared through different methods, then crowns were completed by applying the body porcelain. After cementation the crowns on the epoxy resin dies, the fracture resistance of veneer porcelains was measured by the Universal Test device. Results: The data was analyzed by three-way variance analysis (ANOVA). It was statistically determined that the interaction between the finish line, coping design and materials; and the materials and coping design, and the finish line and the materials. However; no significant interaction was observed between the finish line and coping design; and the materials, coping design and the finish line. Conclusion: The highest fracture resistance values of veneer porcelain was seen in chamfer line White Peaks crowns prepared anatomically, whereas the framework of the lowest fracture resistance values was seen in the chamfer line Lava crowns. Keywords: Coping design, finish lines, fracture resistance, zirconia frameworks

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