Volumetric losses of ceramic specimens (mm3 × 10-3). (A) Volumetric losses of ceramics when opposing to MG. (B) Volumetric losses of ceramics when opposing to GD. (C) Volumetric losses of ceramics when opposing to EQ. (D) Volumetric losses of ceramics when opposing to FT. ZMG, zirconia opposing MI Gracefil; DMG, lithium disilicate opposing MI Gracefil; LMG, leucite opposing MI Gracefil; ZGD, zirconia opposing Gradia Direct P; DGD, lithium disilicate opposing Gradia Direct P; LGD, leucite opposing Gradia Direct P; ZEQ, zirconia opposing Estelite Σ Quick; DEQ, lithium disilicate opposing Estelite Σ Quick; LEQ, leucite opposing Estelite Σ Quick; ZFT, zirconia opposing Filtek Supreme Ultra; DFT, lithium disilicate opposing Filtek Supreme Ultra; LFT, leucite opposing Filtek Supreme Ultra. * Statistical significance.