Fracture resistance of inter-joined zirconia abutment of dental implant system with injection molding technique

ObjectivesZirconia powder in nanometers can be fabricated into inter-joined abutment of dental implant system with the injection shaping technique. This study was to detect the resistance of inter-joined zirconia abutment with different angle loading for clinical applications. Materials and MethodsThe inter-joined abutments were shaped with the technique of injection of zirconia powder in nanometers. Sixty Osstem GSII 5x10mm implants were used with 30 zirconia abutments and 30 Osstem GSII titanium abutments for fixation using 40N torque force. The loading applications included 90 degrees, 30 degrees, and 0 degrees formed by the long axis of abutments and pressure head of universal test machine. The fracture resistances of zirconia and titanium abutments were documented and analyzed. ResultsThe inter-joined zirconia abutments were assembled to the Osstem GSII implants successfully. In the 90 degrees loading mode, the fracture resistance of zirconia abutment group and titanium abutment group were 301.515.4N and 736.4 +/- 120.1N, respectively. And those in the 30 degrees groups were 434.7 +/- 36.1N and 1073.1 +/- 74N, correspondingly. Significant difference in the two groups was found using t-test and Wilcoxon test. No damage on the abutments of the two groups but S-shaped bending on the implants was found when the 0 degrees loading was 1300-2000N. ConclusionsThrough the assembly of Zirconia abutments and implants, all the components presented sufficient resistance acquired for the clinical application under loadings with different angle.