ABSTRACT
Objective To introduce a method of adjusting the coefficient of thermal expansion of dental zirconia ceramic, which contributing to reduce the chipping of the veneering porcelain caused by the mismatch of the expansion coefficients of zirconia and veneering porcelain. Methods Upcera Zr O2/Zr2WP2O12composite ceramic was synthesized by solid-state reaction method.XRD, DIL and SEM were used to test and analyze the composite samples and mechanical properties of the composite samples were investigated too.Results The expansion coefficients of Upcera Zr O2/Zr2WP2O12composites decreased with the mass fraction of the negative thermal expansion material■age of Zr2WP2O12was 2％, the mechanical properties of the Upcera Zr O2/Zr2WP2O12composites were best and close to Upcera Zr O2, without any statistical significance (P＞0.05).And its expansion coefficient was 9.6×10-6/℃, between the expansion coefficients of zirconia and veneering porcelain. Conclusion The negative thermal expansion material Zr2WP2O12can adjust the expansion coefficient of Upcera Zr O2effectively.And the expansion coefficient of Upcera Zr O2/Zr2WP2O12composite is between the expansion coefficients of zirconia and veneering porcelain.Mechanical properties of Upcera Zr O2/Zr2WP2O12composite can meet the clinical requirements.