Al	Aluminum
Al Kα	Aluminum K-alpha radiation
at%	Atomic percentage
CAD/CAM	Computer-aided design/computer-aided manufacturing
C 1s	Carbon 1s photoelectron signal
Ca	Calcium
CI	Confidence interval
Co	Cobalt
Co-Cr	Cobalt–chromium alloy
Cr	Chromium
df	Degrees of freedom
EDS	Energy-dispersive X-ray spectroscopy
FC	Feldspar/Co-Cr
FC-I	Feldspar/Co-Cr interface
FC-S	Feldspar/Co-Cr substrate
FC-V	Feldspar/Co-Cr feldspathic veneer
Fe	Iron
FZ	Feldspar/ZrO2
FZ-C	Feldspar/ZrO2 core
FZ-I	Feldspar/ZrO2 interface
FZ-V	Feldspar/ZrO2 feldspathic veneer
K	Potassium
Mg	Magnesium
Mo	Molybdenum
MZ	Monolithic ZrO2
NA	Not applicable
Na	Sodium
ND	Not detected
O	Oxygen
O 1s	Oxygen 1s photoelectron signal
SEM	Scanning electron microscopy
Si	Silicon
Ti	Titanium
W	Tungsten
wt%	Weight percentage
XPS	X-ray photoelectron spectroscopy
Y	Yttrium
Y-TZP	Yttria-stabilized tetragonal zirconia polycrystal
Zn	Zinc
Zr	Zirconium
ZrO2	Zirconia/zirconium dioxide
µm	Micrometer