Effect of different surface treatment methods on the shear bond strength of zirconia based restorations

Abstract

Statement of the Problem:Delamination of zirconia-veneered restoration is considered to be a very common failure in clinical practice. Therefore, using a chair side intra-oral repair option may be a simple alternative method to the total replacement of the restoration and may provide a clinically-acceptable and reliable immediate solution. Aim of the Study:This study evaluated the shear bond strength of two different repairing systems (CoJet and Ceramic repair N) of zirconia-based restorations and evaluated the effect of high and low sandblasting pressure on the shear bond strength between zirconia and composite resin. Materials and Methods:Thirty zirconia specimens were divided into two main groups according to the repairing systems: Group CJ: CoJet TM repairing system [chairside silica coating with 30 µm SiO 2 + silanization + adhesive] (3M ESPE) (15 specimens). Group CR: Ceramic Repair N system (Ivoclar Vivadent) [grinding with diamond stone + Monobond N universal primer adhesive] (15 specimens). Each group was further sub-divided into three sub-groups according to the surface treatment methods: Sub-groups (CJS 3, 2,1): CoJet Sandblasting at pressure 3,2,1 bar, Sub-group (CRG): Ceramic Repair Grinding with diamond stone and Sub-groups (CRS 2,1): Ceramic Repair Sandblasting with CoJet sand at pressure 2 and1 bar. Tetric N-ceram composite resin was polymerized on each conditioned specimen. The shear bond strength was tested using a universal testing machine, and fracture sites were examined with SEM. The data of bond strengths were statistically analyzed with two-way ANOVA.