Shear Bond Strength at the Interface of Monolithic Zirconia with 3 Different Core-Build Up Materials
Asst. Prof. Ayben Şentürk1, Selin Kartal2, Assoc. Prof. Fehmi Gönüldaş1, Prof. Mehmet Ali Kılıçarslan1
1 Ankara University, Faculty of Dentistry, Department of Prosthodontics,
2 Ankara University, Graduate School of Health Sciences, Department of Prosthodontics
Objectives
Different materials can be used to reconstruct the core foundation in tooth-supported fixed prosthetic restorations. The bond strength of the core material to zirconia is an important factor in the long-term success of the restoration. The aim of this study was to investigate the effect of using different core build-up materials on the shear bond strength of monolithic zirconia.
Materials and Methods
In this experimental in vitro study, 60 zirconia ceramic specimens (10x10x2 mm) were prepared and divided into three groups based on the core material (n=20). Core build-up specimens in cylinder shape (10 mm x 4 mm) were fabricated using flowable composite (RubyFlow Flowable, Inci Dental, Turkey), nanohybrid composite (RubyCompNano, Inci Dental, Turkey), and compomer material (RubyCompomerFlow, Inci Dental, Turkey). Core-build up and zirconia specimens were bonded using zirconia primer and self-adhesive, dual-cure cement (RubySE Cem Inci Dental, Turkey) after sandblasted of the zirconia surfaces (CoJet, 3M ESPE). Shear bond strength was tested at their interfaces by using universal test machine. The failure modes were determined using a stereomicroscope. The data were statistically analyzed with a paired t-test for significant differences (p = 0.05).
Results
The highest values for shear bond strength were achieved in nanohybrid composite (7,8114±1,96542) followed by flowable composite (6,1114±1,42201), and compomer group (5,8032±1,71212). Nanohybrid composite material was significantly higher than other core materials. (p<0.05). There was no statistically significant difference found between flowable composite and compomer material. (p>0.05).
Conclusions
It was concluded that when evaluating the three core build-up materials’ binding to zirconia, the nanohybrid composite showed significantly higher bond strength to zirconia and demonstrated to be the optimal core build-up material.