Turkiye Klinikleri Journal of Dental Sciences

.: ORIGINAL RESEARCH
Farklı Sürelerde Sinterize Edilen Yaşlandırılmış Teknolojik Seramiklerin Optik Analizi
Optical Analysis of Aged Technological Ceramics Sintered at Different Times
Gonca DESTE GÖKAYa, Hatice ŞİMŞEKb, Rukiye DURKANc, Ayhan GÜRBÜZd
aBursa Uludağ Üniversitesi Diş Hekimliği Fakültesi, Protetik Diş Tedavisi ABD, Bursa, TÜRKİYE
Özel Diş Kliniği, Uşak, TÜRKİYE
bAfyonkarahisar Sağlık Bilimleri Üniversitesi, Diş Hekimliği Fakültesi, Protetik Diş Tedavisi ABD, Afyonkarahisar, TÜRKİYE
cAnkara Üniversitesi Diş Hekimliği Fakültesi, Protetik Diş Tedavisi ABD, Ankara, TÜRKİYE
Turkiye Klinikleri J Dental Sci. 2022;28(1):122-9
doi: 10.5336/dentalsci.2020-80498
Article Language: TR
Full Text
ÖZET
 Amaç: Bu in vitro çalışmanın amacı, farklı sinterleme sürelerinin yaşlandırılmış dental monolitik zirkonya seramiklerin renk ve translusensi üzerine etkilerini araştırmaktır. Gereç ve Yöntemler: Elli dört adet disk şeklinde örnek presinterize monolitik zirkonya bloklardan [KATANA High Translusent (KHT) ve NexxZr High Translucent (NHT)] CAD/CAM teknolojisi ile elde edilerek 1500°C'de 3 farklı sinterleme süresine göre [1 saat, 2 saat (üretici tarafından önerilen standart süre) ve 3 saat] n=9 olacak şekilde 6 gruba ayrıldı. Sinterizasyondan sonra örneklere 5.000 döngü ile hidrotermal yaşlandırma işlemi uygulandı. Örnekler sinterizasyondan önce A2 renk solüsyonda bekletildi. CIELab renk koordinatları, spektrofotometre cihazından elde edildi. ∆E değerleri formül üzerinden hesaplandı ve bu verilerin görsel değerlendirmesi yapıldı. Translusensi parametresi (TP) hesaplandı. Veriler, 2 yönlü ANOVA, 2'li karşılaştırmalar ve Fisher'ın LSD Testi 'post hoc' ile analiz edildi (a=0,05). Bulgular: Yaşlandırılmış monolitik zirkonya gruplarında, yaşlandırma öncesi sinterizasyon süresi değişimi TP ve CIELab renk koordinatları için önemliydi. KHT grubunda standart sinterizasyon süresi değiştirildiğinde L*, a*, b* değerleri azalmıştır (p0,05) 1- 3 saat grubunda anlamlı şekilde azalmıştır. KHT grubunda standart sinterizasyon süresi değiştirildiğinde TP değerlerinde değişiklik olmazken, NHT grubunda sinterizasyon süresi uzadığında TP değerleri artmıştır (p>0,05). Sonuç: Standart sinterizasyon süresinin değiştirilmesi, yaşlandırılmış dental monolitik zirkonya seramiklerinin translusensi ve rengini önemli derecede etkiler.

Anahtar Kelimeler: Monolitik zirkonyum; estetik; termal yaşlandırma; translusens; renk değişikliği
ABSTRACT
 Objective: The aim of this in vitro study was to investigate the effects of different sinterization durations on the color and translucency of aged dental monolithic zirconia ceramics. Material and Methods: 54 disc-shaped specimens of presinterized monolithic zirconia blocks [KATANA High Translusent (KHT) ve NexxZr High Translucent (NHT)] obtained by CAD/CAM technology according to 3 different sintering times at 1500 °C [1 hour, 2 hours (standard time recommended by the manufacturer) and 3 hours] divided into 6 groups (n=9). After sinterization process, hydrothermal aging with 5,000 cycles were applied. The specimens were kept in A2 color solution before sinterization. CIELab color coordinates were obtained from the spectrophotometer. The ∆E values were calculated with the formula and visual evaluation was evaluated. The translucency parameter (TP) was calculated. Data were analyzed by 2-way ANOVA, paired comparisons, and Fisher's LSD Test 'post hoc' (α=0.05). Results: In the aged monolithic zirconia groups, the change in sintering time before aging was important for TP and CIELab color coordinates. When the standard sinterization duration was changed in KHT, L*, a*, b* values decreased (p0.05), it decreased significantly in the 1-3 hours group. While there was no change in TP values when the standard sinterization duration was changed in KHT, TP values increased when the sinterization duration increased in NHT (p>0.05). Conclusion: Changing the standard sintering time significantly affects the translucency and color of aged dental monolithic zirconia ceramics.

Keywords: Monolithic zirconia; esthetic; aging; translucency; color difference
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