Gamze PAKEN, Duygu RECEN, Bengisu YILDIRIM

Effect of Universal Shade of Resin Cement on the Final Color of Ceramic Restorations

Objective: To investigate the effect of neutral (N) and universal (Un) shade resincement on the final color of thin ceramic restorations.Materials and Methods: Forty specimens (8×8×0.8 mm3) were sliced from fiveleucite reinforced glass-ceramic blocks. Another 40 rectangular compositespecimens were prepared from a resin die material (8×8×4 mm3; IPS Natural DieMaterial, A1 and A 3,5 IvoclarVivadent) simulating prepared teeth and divided intotwo cement colors. (N and Un) After baseline color measurements, each slice wascemented to a composite resin specimen, and measurements were obtained witha spectrophotometer on a white background in daylight by a single experiencedinvestigator. The difference between the baseline and final color measurementswas calculated in accordance with the CIEDE2000 color measurement formula. TheCIEDE2000 perceptibility and acceptability thresholds were set to 0.8 and 1.8. Thedata were statistically analysed with Shapiro-Wilk and Mann-Whitney U test.Results: No significant difference was observed between ∆00 value in the N(1.18±0.40) and Un (1.26±0.52) groups for the light background. The meandifferences between the N (0.74±0.31) and Un (0.88±0.55) groups were insignificantfor the dark background (p>0.05).Conclusion: The Un shade cement used in this study may mask the dark toothstructure when using 0.8 mm-thickness ceramic restorations. However, theresults may not be clinically satisfying. The Un shade resin cement used in thisstudy provided an improvement in color although it was insufficient to mask theunderlying dark background completely. Using Un shade resin cement is a challengeunder 0.8 mm-thickness ceramic restorations of dark-colored teeth. If preferred,the ceramic thickness should be increased.

Üniversal Renk Rezin Simanın Seramik Restorasyonların Final Rengi Üzerine Etkisi

Amaç: Çalışmanın amacı, nötral (N) ve üniversal (Un) rezin simanın ince seramik restorasyonlarının final rengine etkisinin değerlendirilmesidir. Gereç ve Yöntemler: Çalışmamız için kırk adet lösit ile güçlendirilmiş cam seramik örnek (8×8×0,8 mm) elde edildi. Dental dokuyu taklit eden bir rezin kompozit malzemesinden (8×8×4 mm; IPS Natural Die Material, A1 ve A 3,5 IvoclarVivadent) kırk adet dikdörtgen altyapı örneği hazırlandı ve 2 rezin siman grubuna ayrıldı(N ve Un). Başlangıç renk ölçümlerinden sonra, her seramik dilim bir kompozit rezin örneğinin üzerine yapıştırıldı ve deneyimli bir araştırmacı tarafından gün ışığında beyaz zemin üzerinde bir spektrofotometre ile ölçümler alındı. Başlangıç ve sonuç ölçümleri arasındaki farklılık CIEDE2000 renk ölçüm formülüne göre hesaplandı. CIEDE2000 renk ölçümü için algılanabilirlik ve kabul edilebilirlik eşik değerleri 0,8 ve 1,8 olarak ayarlandı. Veriler, Shapiro-Wilk ve Mann-Whitney U testi ile istatistiksel olarak analiz edildi. Bulgular: Açık arka plan için N (1,18±0,40) ve Un (1,26±0,52) gruplarda ∆00 değerleri arasında anlamlı bir fark yoktu. Koyu arka plan için alınan değerlerde N (0,74±0,31) ve Un (0,88±0,55) gruplar arasında anlamlı bir fark bulunmamıştır (p>0,05). Sonuç: Bu çalışmanın sonuçlarına göre kullanılan Un renk rezin simanın, 0,8 mm kalınlığında seramik restorasyonlar altında koyu diş yapısını maskeleyebildiği, ancak sonuçların klinik olarak tatmin edici olmadığı görülmektedir. Bu çalışmada kullanılan rezin siman, alttaki koyu arka planı tamamen maskelemek için yetersiz olsa bile renkte bir iyileşme sağlamıştır. Koyu renkli dişlerde 0,8 mm kalınlığında seramik restorasyonların simantasyonunda Un renkte rezin siman tercih edilecek ise restorasyonun seramik kalınlığının artırılması gereklidir.

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