Evaluation of fracture strength of different CAD/CAM veneers that are manufactured for zirconia cores

Year 2022, Volume: 9 Issue: 3, 769 - 776, 26.12.2022

Bora Akat , Merve Çakırbay Tanış , Mehmet Ali Kılıçarslan

https://doi.org/10.15311/selcukdentj.1074645

Abstract

Background. The purpose of this study was to evaluate the fracture resistance of zirconia crowns veneered with CAD/CAM fabricated veneers by using simple and anatomic core designs with different veneering materials and procedures.
Methods. A total of 100 zirconia frameworks were fabricated with an anatomic core design or simple core design. The frameworks were then divided into five subgroups according to the following veneering procedures: Control (layering), cemented CAD/CAM fabricated feldspathic veneer, cemented CAD/CAM fabricated lithium disilicate veneer, fused CAD/CAM fabricated feldspathic veneer, and fused CAD/CAM fabricated lithium disilicate veneer. Next, 250000 cycles were applied with an occlusal load of 50 N at 1.6 Hz in a chewing simulator, and a thermal cycle was applied during loading (5°C to 50°C every 60 s). The crowns were then subjected to a single load failure test by using a universal test machine.
Results. Statistical analyses between the groups showed significant differences (F= 23.296; p<0,001). The lowest fracture resistance values were observed in fused feldspathic CAD/CAM veneers with an anatomic core design (470.63). The highest fracture resistance was obtained in cemented lithium disilicate CAD/CAM veneers with a simple core design (2075.06).
Conclusion. Within the limitations of this study, it can be said that the use of CAD/CAM fabricated veneers can be an alternative to layering when their advantages are considered.

Keywords

Dental CAD/CAM, Zirconia Crowns, Core Design, Fracture Strength, Veneering

Supporting Institution

Ankara Üniversitesi

Project Number

14A0234001

Thanks

The authors would like to thank Suat Çifci for design of restorations and İshak Elmas for support to the chewing simulation. This study was supplied by Ankara University Scientific Research Projects Coordination Unit. Project Number: 14A0234001.

Evaluation of fracture strength of different CAD/CAM veneers that are manufactured for zirconia cores

Abstract

Amaç. Bu çalışmanın amacı, farklı veneer materyalleri ve işlemleri ile hazırlanmış basit ve anatomik kor tasarımları kullanarak kaplanmış zirkonya altyapılı kronların kırılma direncini değerlendirmektir.
Gereç ve Yöntemler. Anatomik bir çekirdek tasarımı veya basit bir çekirdek tasarımı ile toplam 100 zirkonya kron altyapısı üretildi. Bu kor altyapılar daha sonra aşağıdaki veneerleme prosedürlerine göre beş alt gruba ayrıldı: Kontrol (katmanlama), simante CAD/CAM fabrikasyon feldspatik veneer, simante CAD/CAM fabrikasyon lityum disilikat veneer, porselenle kaynaştırılmış CAD/CAM fabrikasyon feldspatik veneer ve porselenle kaynaştırılmış CAD/CAM fabrikasyon lityum disilikat kaplama. Daha sonra, bir çiğneme simülatöründe 1,6 Hz'de 50 N'luk bir oklüzal yük ile 250000 döngü uygulandı ve yükleme sırasında bir termal döngü uygulandı (her 60 saniyede bir 5°C ila 50°C). Kronlar daha sonra evrensel bir test makinesi kullanılarak kırma testine tabi tutuldu.
Bulgular. Gruplar arasında istatistiksel analizler önemli farklılıklar gösterdi (F= 23.296; p<0,001). En düşük kırılma direnci değerleri, anatomik çekirdek tasarımlı (470.63) porselenle kaynaştırılmış feldspatik CAD/CAM kaplamalarda gözlendi. En yüksek kırılma direnci, basit bir çekirdek tasarımına (2075.06) sahip simante lityum disilikat CAD/CAM kaplamalarda elde edildi.
Sonuç. Bu çalışmanın sınırlamaları dahilinde, avantajları düşünüldüğünde CAD/CAM fabrikasyon veneerleme tekniklerinin kullanımının katmanlamaya alternatif olabileceği söylenebilir.

Keywords

Zirkonya Kron, Altyapı Tasarımı, Dental CAD/CAM, Kırılma Dayanımı, Veneering

Project Number

14A0234001

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