The aims of the present study were to fabricate Y-TZP/nAl₂O₃/nSiO₂ (n-ZAS) nanocomposites using the pressureless sintering route.

Methods: Nanocomposite samples with different percentages of silica (15 wt%, 20 wt% and 25 wt%) were prepared using slip casting and die pressing techniques. The flexural strength, micro-shear bond strength, and coefficient of thermal expansion (CTE) of all the nanocomposite groups were investigated.

Results: The nanoceramic composed of 10 wt% Al₂O₃ nanoparticles and 25 wt%  nanoparticles displayed a biaxial flexural strength greater than 800MPa, a micro-shear bond strength of about 23.8MPa, and a CTE less than 8 × 10^-6°C^-1.

Conclusions: The phase transformation toughening of zirconia was maintained in the nanocomposite contains of 25 wt%  while the intragranular dispersion of the nano-scaled alumina and silica strengthened the Y-TZP matrix. The CTE of all the nanocomposite samples was distinctly lower than the CTE of the Y-TZP and the porcelain veneers.

Y-TZP/nAl₂O₃/nSiO₂, flexural strength, micro-shear bond strength, CTE.