Evaluation of Fracture Resistance of Zirconia and Resin Nanoceramic Crowns Fabricated with CAD/CAM System

Abstract

Objectives: To compare the fracture resistance of resin nanoceramic crown restorations with monolithic zirconia and bilayered zirconia-based crown restorations. Materials and Methods.: A total of 90 crowns were fabricated. They were divided into 3 equal groups (n = 30) according to the type of material used: group U, resin nanoceramic (LavaTM Ultimate), group MZ, monolithic zirconia (LavaTM Frame), and group BZ (bilayered zirconia substructure with veneering ceramic). Crowns were cemented on prepared teeth using a self-adhesive resin cement (Rely X U100). Fracture resistance was evaluated using a compression test. Results: Two-way ANOVA analysis was used to evaluate the differences between groups and Tukey HSD test was used for multiple group comparisons. In the statistical evaluation, a significant difference was found between all groups in terms of fracture resistance (P<.05). In pairwise comparison, a significant difference was detected between each group (P<.05). The highest fracture resistance was seen in group Mz and the lowest fracture resistance was seen in group U. Conclusion: Resin nanoceramic crown restorations, monolithic and veneered zirconia crowns can withstand normal clinical conditions and their fracture resistance exceeds average masticatory forces

Keywords

• monolithic zirconia
• veneered zirconia
• resin nanoceramic
• fracture resisrance

CAD/CAM Sistemi ile Üretilen Zirkonya ve Rezin Nanoseramik Kuronların Kırılma Dirençlerinin Değerlendirilmesi

Abstract

Amaç: Bu çalışmanın amacı rezin nanoseramik kuron restorasyonların kırılma direncini monolitik zirkonyum ve veneerlenen zirkonyum alt yapılı kuron restorasyonlarıyla karşılaştırmaktır. Gereç ve Yöntemler: Toplam 90 kuron restorasyonu üretildi. Kullanılan materyalin türüne göre 3 eşit gruba (n = 30) ayrıldı: grup U, rezin nanoseramik (LavaTM Ultimate) kuronlar, grup MZ, monolitik zirkonyum (LavaTM Frame) kuronlar ve grup BZ, düşük ısı porseleni ile veneerlenen zirkonyum alt yapılı kuronlar. Restorasyonlar self adeziv rezin siman (Rely X U100) ile prepare edilen dişler üzerine simante edildi. Kırılma direnci kompresyon testi uygulanarak değerlendirildi. Bulgular: Gruplar arasındaki farkları değerlendirmek için iki yönlü ANOVA analizi, çoklu grup karşılaştırmaları için ise Tukey HSD testi kullanıldı. Yapılan istatistiksel değerlendirmede kırılma dirençleri açısından tüm gruplar arasında anlamlı fark tespit edildi (P<.05). İkili karşılaştırmada her bir grup arasında anlamlı fark tespit edildi. (P<.05) En yüksek kırılma direnci Grup Mz’de, en düşük kırılma direnci grup U’da görüldü. Sonuç: Resin nanoseramik kuron restorasyonları, monolitik ve veneerlenen zirkonyum kuronlar normal klinik koşullara dayanabilir ve kırılma dirençleri ortalama çiğneme kuvvetlerinin üzerindedir.

Keywords

• monolitik zirkonyum
• veneerlenen zirkonyum
• rezin nonoseramik
• kırılma direnci

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