Abstract:

Objective To investigate the bonding properties and interface characterization of a domestic 3mol yttrium-stabilized tetragonal zirconium polycrystal（3Y-TZP） framework fired on with 4 different veneering ceramics for zirconia. Methods 4 different commercial veneering ceramics for zirconia（VITA VM9, SHOFU VINTAGE ZR, IPS e.max Ceram, Cercon ceram kiss） were sintered on 3Y-TZP rectangulars（15 mm×5 mm×5 mm） according to the manufacturers′ instructions for shear bond strength test, a metal-ceramic system（Ni-Cr alloy/VITA VMK95） was fabricated in the same type as a control group. Two bilayered specimens（3Y-TZP/VITA VM9, Ni-Cr/VMK95） were prepared for scanning electron microscope（SEM） and energy distribution spectrum（EDS）. Results The values of shear bond strength test were （18.83±1.77）MPa for 3Y-TZP/VITA VM9, （23.83 ±7.05）MPa for 3Y-TZP/SHOFU VINTAGE ZR, （17.87±2.30）MPa for 3Y-TZP/IPS e.max Ceram, （22.26±7.45）MPa for 3Y-TZP/Cercon ceram kiss, （20.55±5.13）MPa for Ni-Cr alloy/VITA VMK95. There was no statistically significant between all-ceramic groups and the control group （P＞0.05）. The failure modes in all-ceramic groups showed predominately adhesive at the interface. SEM showed the 3Y-TZP/VITA VM9 contacted tightly at the interface, while EDS detected Si element diffused into 3Y-TZP material. Conclusion The results indicate that domestic 3Y-TZP has a good interface compatibility with 4 commercial veneering ceramics, as a dental framework material, it can satisfy the clinical requirements.

Key words: zirconia, veneering ceramic, shear bond strength