In Vitro Evaluation of Fracture Strength of Different Heat-Pressed All-Ceramic Crown Systems

Öz

Aim: The aim of this in vitro study was to compare the mechanical strength of 3 different heat-pressed all-ceramic crown systems (Creapress, IPS Empress and Finesse) both staining and layering techniques and porcelain-fused-to-metal restorations (PFM) utilizig with crown shaped samples and a strength analysis system.
Materials and method: A total of 84 crowns were prepared for 7 groups (n=12) on metal dies, representing the maxillary right central incisor. Measurements of mechanical strength were performed at universal mechanical strength test device with 4mm steel ball force tec-nique. One-way analysis of variance and Duncan Multiple Range Test were used to compare statistical data with Minitab 12.2 (Minitab Inc., USA) program.
Results: The average mechanical strength of the tested groups ranged from 527,67±35,53 to 1649,57±125,89 N. Analysis revealed that there were significant differences in the mean mechanical strength among the groups (P<0,01). Porcelain-fused-to-metal restorations (PFM) crowns mechanical strength limits are the highest values fallowed by IPS Empress 2 crowns limits. Other pressable ceramic systems had acceptable fracture strength limits. However Creapress layering tecnique performed the lowest mechanical strength values that can cause clinical performance, longevity risks.
Conclusion: All heat-pressed all-ceramic crown systems are reliable regarding the mechanical fracture strength.

Anahtar Kelimeler

• Heat-pressed all-ceramic crown systems
• fracture strength
• metal-ceramic crown systems

ISI İLE PRESLENEN FARKLI TAM SERAMİK KRONLARIN KIRILMA DİRENÇLERİNİN İN VİTRO OLARAK DEĞERLENDİRİLMESİ

Öz

Amaç: Bu çalışmanın amacı ısı ile preslenen 3 farklı tam seramik kron sisteminin (Creap-ress, IPS Empress ve Finesse; boyama ve tabakalama teknikleri) ve metal destekli porselen (PFM) restorasyonların mekanik direncini kron örneklerle ve güç analiz sistemi yardımıyla karşılaştırmaktır.
Gereç ve yöntem: Toplam 84 örnek, üst santral dişi yansıtan metal daylar üzerine 7 gu-rupta (n=12) hazırlandı. Mekanik direnç ölçümleri 4mm çelik bilya kuvvet tekniği ile üniver-sal mekanik direnç test cihazında gerçekleştirildi. Çalışmamızda direnç ölçümlerinden elde ettiğimiz sonuç veriler, Minitab 12.2 (Minitab Inc., USA) programı ile faktöriyel (tek yönlü) varyans analizi ve Duncan testi (Duncan Multiple Range Test) ile istatistiksel olarak analiz edilmiştir.
Bulgular: Grupların test edilen mekanik direnç ortalamalarının 527,67±35,53 ile1649,57±125,89 N arasında değiştiği bulundu. Analizlere göre gruplar arasında istatistik-sel olarak mekanik direnç açısından fark bulundu (P<0,01). Metal destekli porselen (PFM) restorasyonların mekanik direnç limitleri en yüksek değerler olarak tespit edildi, bu değerleri IPS Empress 1 kron örnekleri direnç limitleri takip etmektedir. Diğer preslenebilir tam se-ramik kron sistemlerinde kabul edilebilir mekanik direnç ölçümleri tespit edilmiştir. Bu bilgilere ilave olarak Creapress tabakalama tekniğinde en düşük mekanik direnç değerleri elde edilmiştir ki bu değerler, sistemin klinik performansı ve klinik kullanım süresi konusunda riskler bulunduğunu öngörmektedir.
Sonuç: araştırmada kullanılan ısı ile preslenen tam seramik kron sistemlerinin mekanik direnç açısından güvenilir olduğu bulunmuştur.

Anahtar Kelimeler

• Isı ile preslenen tam seramik kron sistemleri
• kırılma direnci
• metal seramik kron sistemleri

Kaynakça

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