Turkiye Klinikleri Journal of Dental Sciences

.: ORIGINAL RESEARCH
İki Farklı Hızlı Sinterleme Protokolünün ve İki Farklı Yüzey İşleminin Çok-Katmanlı Monolitik Zirkonyanın Işık Geçirgenliği Üzerine Etkisi
The Effect of Two Different Rapid Sintering Protocols and Two Different Surface Treatments on Light Transmission of Multi-Layer Monolithic Zirconia
Mehmet Emre COŞKUNa, Faik TUĞUTa
aProtetik Diş Tedavisi ABD, Sivas Cumhuriyet Üniversitesi Diş Hekimliği Fakültesi, Sivas, TÜRKİYE
Turkiye Klinikleri J Dental Sci. 2019;25(3):301-9
doi: 10.5336/dentalsci.2018-64201
Article Language: TR
ÖZET
Amaç: Bu in vitro çalışmada, tedavi süresini kısaltmak için kullanılan iki farklı hızlı sinterleme protokolünün ve iki farklı yüzey işleminin çok-tabakalı monolitik zirkonya örneklerin ışık geçirgenliği üzerine etkilerini araştırmaktır. Gereç ve Yöntemler: Kırk adet kare şeklinde, 10x10 mm boyutlarında 1 mm kalınlığında çok-tabakalı monolitik zirkonya (Katana ML, Kuraray, Hattersheim am Main, Almanya) örnekler uygulanan sinterleme protokollerine göre hızlı (HS) (1510°C' de 30 dk) ve süper-hızlı (SH) (1580°C'de 10 dk) olarak iki gruba ayrıldı. Sinterleme sonrasında taramalı elektron mikroskobu (SEM) görüntüleri alındı. Sonrasında uygulanan yüzey işlemine göre örnekler iki alt gruba (glaze, polisaj) ayrıldı. Örneklerin ışık geçirgenlik değerlerinin ölçümünde LED ışık kaynağı ve power-metre kullanılır iken, yüzey pürüzlülükleri profilometre yardımıyla ölçüldü. Elde edilen veriler Kruskall-Wallis ve Mann- Whitney U testi kullanılarak değerlendirildi. Bulgular: Çalışmamızda, en yüksek ışık geçirgenliği değerleri HS grubundaki örneklerde saptanmıştır. Bütün gruplarda örneklerin mine katmanları diğer katmanlara göre daha yüksek ışık geçirgenliği değerlerine sahip olarak bulunmuştur. En yüksek değer ise glaze uygulanan HS grubunun mine katmanında belirlenmiştir (%17,6). Örneklerin yüzeyine uygulanan glaze işleminin polisaj uygulamasına kıyasla pürüzsüzlüğün elde edilmesinde daha etkili olduğu ve artan pürüzsüzlük değeriyle birlikte ışık geçirgenlik miktarının da arttığı belirlenmiştir. Sonuç: Zirkoyanın estetik başarısı için gerekli olan optik özellik süper-hızlı sinterleme işlemiyle gelişim gösterirken yüzeye uygulanan glaze işlemi bu gelişimi artırıcı etki göstermektedir.

Anahtar Kelimeler: Monolitik; çok-katmanlı zirkonya; ışık geçirgenliği; hızlı sinterleme
ABSTRACT
Objective: The aim of this in-vitro study was to investigate the effects of two different fast sintering protocols and two different surface treatments on transmission of multilayer monolithic zirconia. Material and Methods: 40 multi-layer monolithic zirconia (Katana ML, Kuraray, Hattersheim am Main, Germany) square shape specimens with a 10x10 mm dimension at a thickness of 1 mm divided into 2 groups according to the sintering protocols, fast (HS) (1510°C for 30 min) and super-fast (SH) (1580°C for 10 min). Scanning electron microscopy (SEM) images were taken after sintering. Afterwards, the samples were divided into 2 sub-groups according to the applied surface treatments (glaze, polishing). The transmission values of the samples were measured by using LED light source and power-meter and the surface roughness values were measured by using a profilometer. The results obtained in this study were evaluated by using Kruskall-Wallis and Mann-Whitney U tests. Results: In this research, the highest transmission values were determined from the samples of HS group. The enamel layers of the samples in all groups were found to have the highest transmission values than the other layers. The highest value was determined in the enamel layer of HS glazed group (17.6%). It was determined that the glaze treatment applied to the surface of the samples was more effective in obtaining smoothness compared to the polishing application and the amount of transmission increased with increasing smoothness value. Conclusion: While the optical property required for the aesthetic success of zirconia enhance by the super-fast sintering process, the glaze process applied to the surface increases this development.

Keywords: Monolithic; multi-layered zirconia; transmission; fast sintering
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