Turkiye Klinikleri Journal of Dental Sciences

.: ORIGINAL RESEARCH
Comparative Evaluation of Fracture Strength and Failure Mode of Three Different CEREC Omnicam Endocrowns: An In Vitro Study
Üç Farklı CEREC Omnicam Endokronun Kırılma Dayanıklılığı ve Kırılma Modlarının Karşılaştırılması: İn Vitro Bir Çalışma
Burcu ALTUNa, Fatma Dilşad ÖZb, Şükran BOLAYb
aEtimesgut Oral and Dental Health Center, Ankara, Türkiye
bDepartment of Restorative Dentistry, Hacettepe University Faculty of Dentistry, Ankara, Türkiye
Turkiye Klinikleri J Dental Sci. 2022;28(2):442-9
doi: 10.5336/dentalsci.2021-84878
Article Language: EN
Full Text
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.

Keywords: CAD/CAM; endocrown; fracture strength
ÖZET
 Amaç: Bu in vitro çalışmada, bilgisayar destekli tasarım/bilgisayar destekli üretim [computer aided design/computer aided manufacturing (CAD/CAM)] sisteminde kullanılan içeriği farklı seramik bloklardan hazırlanan porselen endokronların kırılma dayanıklılığı açısından değerlendirilmesi amaçlanmıştır. Gereç ve Yöntemler: Kırk beş adet çekilmiş insan alt molar dişi rastgele 3 gruba ayrıldı (n=15). Üç gruptaki 45 dişe standart kanal tedavisi işlemi uygulanıp, endokron preparasyonu yapıldı. Deney grupları şu şekilde belirlendi: Grup 1; Zirkonyum ile güçlendirilmiş lityum silikat seramik (Vita Suprinity, Vita Zahnfabrick, Bad Säckingen, Almanya), Grup 2; Lityum disilikat seramik (IPS e.max CAD, Ivoclar Vivadent, Schaan, Lichten stein) ve Grup 3; Rezin hibrit nanoseramik (Cerasmart, GC, Tokyo, Japonya). Restorasyonlar, 'dual-cure' rezin siman Variolink N (Ivoclar Vivadent, Schaan, Lihtenştayn) kullanılarak dişlere simante edildi ve örnekler distile suda 37°C'de 24 saat süre ile bekletildi. Daha sonra tüm örnekler 5°C ve 55°C arasında 5.000 döngülük termal siklus işlemine tabi tutuldu. Örneklere üniversal bir test cihazında kırılma dayanıklılığı testi 0,5 mm/dk hızla yükleme yapılarak uygulandı. Restorasyonların maksimum kırılma dayanıklılığı (Newton) değerleri kaydedildi. Örneklerin kırılma tipleri incelendi. Kırılma dayanıklılığı testi bulguları, tek yönlü ANOVA varyans analizi ile değerlendirildi (p=0,05). Bulgular: En yüksek ortalama kırılma dayanıklılığı Grup 3'te görüldü (2.379,6±483,07 N). Bu değer diğer grupların ortalama değerlerinden anlamlı olarak yüksek bulundu (p0,05). Sonuç: CEREC Omnicam sistemi ile üretilen rezin nanoseramik endokronların kırılma dayanıklılığının diğer gruplardan anlamlı olarak yüksek olduğu sonucuna varıldı.

Anahtar Kelimeler: CAD/CAM; endokron; kırılma dayanıklılığı
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