Farklý yöntemlerle üretilen ve yüzey iþlemleri uygulanan metal alt yapýlarýn dental seramikler ile baðlantý dayanýmlarýnýn deðerlendirilmesi: Deneysel çalýþma

GÝRÝÞ ve AMAÇ: Farklý yöntemlerle pürüzlendirilen krom-kobalt (Cr-Co) alt yapý malzemesi ile üst yapý porseleninin baðlanma dayanýmýnýn( PBD) deðerlendirilmesi amaçlanmýþtýr.
YÖNTEM ve GEREÇLER: Disk þekilli Cr-Co alaþým üç farklý teknikle (Döküm, CAD/CAM, Lazer sinterleme) elde edildi. Örnekler, uygulanacak yüzey iþlemine göre rastgele alt gruplara ayrýldý (n=10); GrupK: Al2O3 Kumlama (Kontrol grubu olarak), GrupE: Er-YAG lazer(1,5W), GrupN: Nd-YAG lazer (1,5W), GrupY: Ytterebirium lazer (10W). Örneklere yüzey þartlandýrma sonrasý veneer porseleni uygulandý. 24 saat süreyle 37˚C suda bekletilen örnekler, universal test cihazýnda kýrýldý (0,5 mm/dk). Her bir gruptan alýnan örneklerin yüzeylerinde olan deðiþiklikler taramalý elektron mikroskobunda (SEM) incelendi. Ýstatistiksel deðelendirme için Kruskall-Wallis ve Mann-Whitney U testi kullanýldý.
BULGULAR: Farklý yüzey þartlandýrma iþlemleri ve üretim yöntemlerinin PBD deðerleri arasýndaki fark istatistiksel olarak anlamlý bulundu(p<0,05). Döküm ve CAD/CAM ile üretilen materyallerin farklý yüzey iþlemleri sonrasý PBD deðerlerinin istatistiksel olarak anlamlý olmadýðý fakat lazer iþlemlerin kumlamaya benzer baðlanma dayanýmý gösterdiði görüldü. En yüksek dayaným deðerinin lazer sinter alt yapý üzerine uygulanan Nd-YAG lazer ile pürüzlendirme iþleminde olup ve istatistiksel olarak anlamlý olduðu görüldü. Er-YAG ve Nd-YAG lazer uygulamalarýnýn tüm alt yapý materyalleri arasýnda baðlaným dayanýmý açýsýndan istatistiksel olarak anlamlý olduðu (p<0,05) ve en yüksek CAD/CAM alt yapýsýnda olduðu görüldü.
TARTIÞMA ve SONUÇ: PBD farklý üretim yöntemlerine ve yüzey þartlandýrma iþlemlerine göre deðiþebilir. Er-YAG ve Nd-YAG lazer uygulamasý kumlamaya alternatif olarak gösterilebilir.

Evaluation of the bond strength with dental ceramics of metal substructures produced by different methods and applied with surface treatments: In-Vitro study

INTRODUCTION: It was aimed to evaluate the shear bond strength (SBS) of chromium-cobalt (Cr-Co) infrastructure material and superstructure porcelain, which is roughened by different methods.
METHODS: Disc-shaped Cr-Co alloy was obtained by three different methods (Casting,CAD/CAM,Laser sintering). The samples were randomly divided intosubgroups according to the surface treatment to be applied (n=10); GroupK: Al2O3 Sandblasting (as Control group), GroupE: Er- YAG laser (1,5W), GroupN: Nd-YAG laser (1.5W), GroupY: Ytterebirium laser (10W). After surface treatments, veneer porcelain was applied to the samples. The samples, which were kept in water at 37˚C for 24 hours, were broken in a universal test machine (0,5 mm/min). The changes in the surfaces of the samples taken from each group were examined under scanning electron microscopy (SEM). Kruskall-Wallis and Mann-Whitney U tests were used for statistically analysis.
RESULTS: The difference between SBS values of different surface treatments and production methods was found to be statistically significant(p<0,05). It was observed that the SBS values of the materials produced by casting and CAD/CAM after different surface treatments were not statistically significant, but the bond strength of the laser treatments was similar to sandblasting. The highest strength value was found laser sinter infrastructure in the treated with the Nd-YAG laser and it was found to be statistically significant. It was seen that Er-YAG and Nd-YAG laser applications were statistically significant (p<0,05) among all infrastructure materials in terms of bond strength and the highest was in the CAD/CAM infrastructure.
DISCUSSION AND CONCLUSION: The SBS may vary according to different production methods and surface conditioning processes. Er-YAG and Nd-YAG laser application can be shown as an alternative to sandblasting.