Turkiye Klinikleri Journal of Dental Sciences

.: ORIGINAL RESEARCH
Yaşlandırma Yöntemlerinin Zirkonyumun Dayanıklılığına Etkisi
Effect of Aging Process on Strength of Zirconia
Cem ŞAHİNa
aHacettepe Üniversitesi Sağlık Hizmetleri Meslek Yüksekokulu, Ağız ve Diş Sağlığı Programı Ankara, TÜRKİYE
Turkiye Klinikleri J Dental Sci. 2021;27(3):433-8
doi: 10.5336/dentalsci.2020-78814
Article Language: TR
Full Text
ÖZET
 Amaç: Zirkonyum belirli bir süre boyunca yüksek ısı, nem ve stres gibi dış etkenlere maruz kaldığında, sahip olduğu tetragonal fazdaki kararlı yapısından çıkarak daha az kararlı olduğu monoklinik faza dönüşüm gösterir. Bu dönüşüm sırasında materyal, hacimce genişleyerek, çatlak oluşumunu tetikler. Bu süreç devam ettikçe dayanıklılığını önemli ölçüde kaybetmeye başlar. Zirkonyumun dayanıklılığındaki değişimler bilinen yaygın yöntemler uygulanarak incelenebilir. Ancak zirkonyuma uygulanan yaşlandırma yöntemleri çok fazla çeşitlilik göstermektedir. Bu çalışma; ısı, basınç ve süre gibi değişen parametrelere sahip hızlandırılmış yaşlandırma yöntemi sonrasında zirkonyum örneklerin kırılma dayanımlarındaki değişimleri incelemeyi amaçlamaktadır. Gereç ve Yöntemler: Kırk adet 3 mol Y2O3 ile stabilize edilmiş zirkonyum örnek, 1,2x5x24 mm boyutlarında önceden fırınlanmış bloklardan CAD/CAM sistemi kullanılarak hazırlandı. Örnekler daha sonra rastgele olarak onarlı 4 gruba ayrıldı ve kontrol grubu dışındaki gruplara hızlandırılmış yaşlandırma uygulandı. Yaşlandırma prosedürleri sonrası test örneklerine 3 nokta kırılma testi uygulandı. Bulgular: Hiçbir yaşlandırma işlemi uygulanmamış örneklerde ortalama dayanım değeri 389,62±2,02 N bulunmuştur ve bu değer istatistiksel olarak diğer tüm gruplardan farklıdır (p=0,01<0,05). Üç nokta kırılma testinde en düşük dayanım 180-5 grubunda elde edilmiştir (320,57±1,42 N) ve bu değer istatistiksel olarak tüm gruplardan farklıdır (p=0,01<0,05). Sonuç: Isı değişkeni hızlandırılmış yaşlandırma yönteminin en etkin parametresi olarak bulunmuştur.

Anahtar Kelimeler: Yttria stabilize dörtgen zirkon; dental restorasyon başarısızlığı; yorulma kırıkları
ABSTRACT
 Objective: In the presence of high temperature, humidity and stress for a certain period of time, zirconium exhibits phase transformation from its stable tetragonal phase to less stable monoclinic phase. During this transformation, the material expands in volume which trigger crack formation. As this process continues, zirconium starts to lose its durability significantly. Changes in the durability of zirconium can be studied using commonly known methods. However, the aging methods applied to zirconium may vary. This study aims to investigate the changes in the fracture strength of zirconium samples after the accelerated aging method with varying parameters such as temperature, pressure and time. Material and Methods: Forty zirconium sample stabilized with 3 moles of Y2O3 with 1.2x5x24 mm dimensions were prepared by using a CAD/CAM system from pre-sintered blocks. The samples were then randomly divided into 4 groups each containing 10. Accelerated aging procedure was then applied to groups without the control group. After the aging procedures, three-point bending test was applied to the test samples. Results: The mean fracture resistance value was found to be 389.62±2.02 N in the samples at group without aging procedure and this value was statistically different from all other groups (p=0.01<0.05). The lowest strength in the three-point fracture test was obtained in the '180-5' group (320.57±1.42 N) and this value was statistically different from all groups (p=0.01<0.05). Conclusion: Heat variable was found to be the most effective parameter of accelerated aging method.

Keywords: Yttria stabilized tetragonal zirconia; dental restoration failure; fatigue fractures
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