Search

Amac: Bu calismada, kenar bitim ve alt yapi sekillerinin cesitli zirkonyum alt yapilar uzerindeki vener porselenlerinin kirilma direncine etkisi in vitro olarak incelenmistir. Gerec ve Yontem: Orneklerin elde edilecegi kesilmis ust 1. kucuk azi disini temsil eden gudukler; 1. Guduk; 6 mm kuron boyu ve 6 0 taper acisinda 1 mm shoulder basamak ile anatomik okluzal yuzeyli, 2. Guduk; 6 mm kuron boyu ve 6 0 taper acisinda 1 mm chamfer basamak ile anatomik okluzal yuzeyli, 3. Guduk; 6 mm kuron boyu ve 6 0 taper acisinda, 1 mm shoulder basamak ile duz okluzal yuzeyli, 4. Guduk; 6 mm kuron boyu ve 6 0 taper acisinda 1 mm chamfer basamak ile duz okluzal yuzeyli olarak standardizasyonun saglanmasi amaciyla CNC torna tezgahinda hazirlanmistir. Guduklerden alinan olculerden 60 adet epoksi rezin guduk elde edilmistir. Zirkonyum alt yapilar farkli yontemlerle hazirlandiktan sonra ust yapi porseleni uygulanarak kuronlar tamamlanmistir. Kuronlar epoksi rezin gudukler uzerine simante edildikten sonra vener porselenlerinin kirilma direncleri Universal test cihazinda saptanmistir. Bulgular: Veriler uc yonlu varyans analizi (ANOVA) ile degerlendirilmistir. Kenar bitim sekli, alt yapi sekli ve materyallerin, materyaller ile alt yapi sekli, materyaller ile kenar bitim sekli arasindaki etkilesimin anlamli oldugu, kenar bitim sekli ile alt yapi sekli, materyaller ile alt yapi sekli ve kenar bitim sekli arasindaki etkilesimlerin ise anlamli olmadigi istatistiksel olarak tespit edilmistir. Sonuc: En yuksek vener porselen kirilma direnci degerlerinin alt yapisi anatomik sekilde hazirlanan chamfer basamakli White Peaks kuronlarda, en dusuk kirilma direnci degerlerinin ise alt yapisi duz sekilde hazirlanan chamfer basamakli Lava kuronlarda oldugu gorulmustur. Anahtar Kelimeler: Alt yapi sekli, kenar bitim sekli, kirilma direnci, zirkonyum alt yapilar. 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 6 0 taper angle, having an anatomic occlusal surface with a 1 mm shoulder line, the second die; with a 6 mm crown length and at 6 0 taper angle, having an anatomic occlusal surface with a 1 mm chamfer line, the third die; with a 6 mm crown length and at 6 0 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 6 0 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 were 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. Key Words: Coping design, finish lines, fracture resistance, zirconia frameworks