Üç Farklı CEREC Omnicam Endokronun Kırılma Dayanıklılığı ve Kırılma Modlarının Karşılaştırılması: İn Vitro Bir Çalışma

Abstract

Objective: The aim of this in vitro study was to evaluate fracture strength of porcelain endocrown produced by a computer aided design/computer aided manufacturing (CAD/CAM) system using different types of ceramic blocks. Material and Methods: Forty-five extracted human mandibular molars were divided randomly into 3 groups (n=15). Standardized endodontic treatment was applied the forty-five molars in 3 groups, received endocrown preparations. Experimental groups were; Group 1 (VS); Lithium silicate reinforced with zirconia (Vita Suprinity, Vita Zahnfabrick, Bad Säckingen, Germany), Group 2 (EM); Lithium silicate (IPS e.max CAD, Ivoclar Vivadent, Schaan, Lichtenstein) and Group 3 (CS); Resin nanoceramic (Cerasmart, GC, Tokyo, Japan). Restorations were cemented with dual-cure resin cement Variolink N (Ivoclar Vivadent, Schaan, Liechtenstein) and samples were stored in distilled water at 37°C for 24 hours. All samples were subjected to thermocycling for 5,000 cycles in water baths between 5°C and 55°C. The fracture strength of samples was determined under compressive loads at a 0.5 mm/min crosshead speed until fracture. The maximum fracture strength (Newton) values of the restorations were recorded. Fracture strength data were evaluated with one-way ANOVA (p=0.05). Results: The highest fracture strength values were observed in CS (2,379.6±483.07 N), which was significantly higher than the other groups (p0.05). Conclusion: Resin nanoceramic endocrowns produced using CEREC Omnicam system demonstrated significantly higher fracture strength values than the other groups.