.: ORİJİNAL ARAŞTIRMA
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
Turkiye Klinikleri J Dental Sci. 2022;28(2):442-9
doi: 10.5336/dentalsci.2021-84878
Makale Dili: EN
Tam Metin
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
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
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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