Kahvede Bekletilen Farklı CAD/CAM Blokların Renk Stabilitelerinin Değerlendirilmesi

Amaç: Renk uyumu, hastaların estetik olarak uyumlu restorasyon arayışlarının artması nedeniyle günümüzde daha da önem kazanmıştır. Bununla birlikte, mevcut CAD/CAM blokların renk değişikliği ve translusentliklerindeki değişiklikler hakkında hala bilgi eksikliği bulunmaktadır. Bu çalışmanın amacı, kahvede bir ay bekletme süresinin ardından farklı CAD/CAM blokların renk stabilitesinin, translusentliğinin, su emiliminin ve suda çözünürlüğünün araştırılmasıdır. Gereç ve Yöntemler: Dört CAD/CAM blok materyali ve bir geleneksel kompozit reçine değerlendirilmeye alınmıştır. Örnekler 2 mm kalınlığında hazırlanmıştır ve örneklerin CIELab değerleri, siyah ve beyaz arka plan üzerinde klinik spektrofotometre ile ölçülmüştür (n=6). Kahve veya distile suda bir ay bekletildikten sonra renk ve translusentlik değişimleri hesaplanmıştır. Su emilimi ve suda çözünürlük değerleri ayrıca ISO 4049: 2009'a göre belirlenmiştir (n=6). Veriler iki yönlü ANOVA ve Tukey’in ikili karşılaştırmalarıyla analiz edilmiştir (α=0,05). Bulgular: CAD/CAM blokların renk değişimleri 1,5 ile 7,3 arasında bulunmuş ve translusentlikleri azalmıştır. Bir aylık kahvede bekletilme sonucunda, en yüksek renk değişimi nano kompozit reçinede (7,3) gözlenirken en düşük renk değişimi feldspatik porselende (1,5) gözlenmiştir. Polimer bazlı CAD/CAM materyaller arasında istatistiksel olarak anlamlı bir fark bulunmamaktadır. Renk değişiklikleri ile su emilimi veya suda çözünürlük arasında korelasyon bulunmamıştır. Sonuç: Feldspat seramik hariç tüm materyaller kahve içerisinde bir ay bekletildikten sonra klinik olarak kabul edilebilir eşik seviyesini (2.7) aşan bir renk değişikliği göstermiştir. En yüksek renk değişimi nano kompozit reçine materyalde gözlenmiştir.

Evaluation of Stain Susceptibility of Different CAD/CAM Blocks After Immersion in Coffee

Aim: Color stability is gaining more importance today due to majority of patients are seeking color matchingrestorations. However, there is still lack of information on staining and changes in translucency of recent CAD/CAMblock materials. The goal of the current study was to evaluate the discoloration susceptibility, translucency change,water solubility, and water sorption of different CAD/CAM materials after one-month of immersion in coffee.Material and Methods: Four CAD/CAM block materials and one conventional composite resin were examined. TheCIELab values of CAD/CAM materials were determined using a clinical spectrophotometer on black and whitebackgrounds. The color changes and translucency differences were calculated after immersion in coffee or distilledwater for one month (n=6). Water solubility and sorption were also determined according to the ISO 4049:2009 (n=6).The data were calculated by 2-way ANOVA and Tukey’s pair-wise comparisons (α=0.05).Results: Color changes of the CAD/CAM materials tested ranged from 1.5 to 7.3, and translucency reduced. Thehighest color change was observed in nanocomposite resin (7.3), whereas the lowest color change was observed infeldspathic porcelain (1.5) after storing in coffee for a month. There was no significant difference among the polymerbased CAD/CAM materials. No correlation was determined between color changes and water sorption/solubility.Conclusion: All materials except feldspar ceramic showed a discoloration exceeding the clinically acceptable thresholdlevel (2.7) after being stored in coffee for one month. The highest color change was observed in nanocomposite resinmaterial.

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