Sinterleme protokolü ve yttria içeriğinin farklı zirkonya materyallerinin translüsensi, beyazlık indeksi ve CIELAB renk parametrelerine etkisi

Abstract

Amaç: Bu çalışma, farklı yttria içeriklerine sahip zirkonya materyallerine uygulanan sinterleme protokollerinin translüsensi, beyazlık indeksi ve renk parametreleri üzerindeki etkilerini değerlendirmeyi amaçlamaktadır. Yöntem: A2 renginde, IPS e.max ZirCAD Prime (4Y-TZP), AIZir SHT Plus (5Y-TZP), Whitepeaks CopraSupreme (7Y-TZP), Upcera 4D Explore Esthetic (8Y-TZP) ve Upcera ST White (4-6Y-TZP) olmak üzere beş farklı zirkonya bloktan 12 mm çapında 1 mm kalınlığında toplam 120 örnek (her grup için n=24) hazırlandı ve her grup, standart sinterleme ve hızlı sinterleme olmak üzere iki alt gruba ayrıldı (n=12). Sinterleme işlemleri, üretici firma talimatlarına uygun olarak inLab Profire (Dentsply Sirona,Almanya) sinterleme fırınında gerçekleştirildi. Translüsensi (TP₀₀) ve beyazlık indeksi (WID) ölçümleri, VITA Easyshade V (Vita Zahnfabrik, Almanya) spektrofotometresi kullanılarak gerçekleştirilmiştir. Elde edilen veriler, iki yönlü varyans analizi ile analiz edilmiştir (α=0.05). Bulgular: Sinterleme protokolü ve yttria içeriği faktörlerinin TP₀₀ değeri üzerinde istatistiksel olarak anlamlı bir etkisi bulunmamıştır (p>0.05). WID değerleri ise tüm faktörlerden etkilenmiştir (<0.05). En yüksek WID değeri standart olarak sinterlenmiş WhitePeaks CopraSupreme (7Y-TZP) grubunda görülürken (23.79±0.17), en düşük değerler ise hızlı sinterlenen AIZir SHT Plus [(5Y-TZP) (9.31±0.81)] ve Upcera ST White [(4-6Y-TZP) (8.46±0.51)] gruplarında elde edilmiştir. Upcera 4D Explore Esthetic grubu hariç tüm gruplarda, standart sinterleme uygulanan örnekler daha yüksek WID değerleri göstermiştir. Sonuç: Sinterleme protokolü translüsensi üzerinde anlamlı bir değişime yol açmazken, beyazlık indeksi ve renk parametrelerini önemli ölçüde etkilemiştir. Materyal bileşimi ve yttria içeriği bu farklılıklarda belirleyici rol oynamaktadır. Klinik uygulamalarda materyal seçimi ve sinterleme protokolü birlikte değerlendirilmelidir.

Keywords

• Hızlı sinterleme
• sinterleme
• optik özellikler
• renk ölçümü
• Y-TZP

Effect of sintering protocol and yttria content on the translucency, whiteness ındex, and CIELAB color parameters of different zirconia materials

Abstract

Aim: This study aimed to evaluate the effects of different sintering protocols on the translucency, whiteness index, and color parameters of zirconia materials with varying yttria contents. Methods: A total of 120 specimens (n=24 per group) were prepared from five different zirconia blocks in A2 shade: IPS e.max ZirCAD Prime (4Y-TZP), AIZir SHT Plus (5Y-TZP), Whitepeaks CopraSupreme(7Y-TZP), Upcera 4D Explore Esthetic (8Y-TZP) and Upcera ST White (4-6Y-TZP). Each group was divided into two subgroups according to the sintering protocol: conventional and rapid sintering(n=12). Sintering procedures were performed in an inLab Profire furnace(Dentsply Sirona, Germany) according to the manufacturer’s instructions.Translucency parameter(TP₀₀) and whiteness index(WID were measured using a VITA Easyshade V spectrophotometer(Vita Zahnfabrik,Germany) against black, white, and neutral gray backgrounds. Data were analyzed using two-way analysis of variance (α=0.05). Results: TP₀₀ was not significantly affected by sintering protocol or yttria content(p>0.05). WID values were significantly affected by all factors (p<0.05). The highest WID value was observed in the conventionally sintered Whitepeaks CopraSupreme (7Y-TZP) group (23.79±0.17), while the lowest values were recorded in the speed-sintered AIZir SHT Plus [(5Y-TZP) (9.31±0.81)] and Upcera ST White [(4–6Y-TZP) (8.46±0.51)] groups. Except for the Upcera 4D Explore Esthetic group, conventionally sintered specimens exhibited higher WID values compared to their speed-sintered counterparts. Conclusion: Sintering protocol had no significant effect on translucency but substantially influenced whiteness index and color parameters. In clinical practice, material selection and the sintering protocol should be considered together.

Keywords

• Speed sintering
• sintering
• optical properties
• color measurement
• Y-TZP

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