FDA Zirconium Oxide Ceramic Super Translucent Multi - Layer
Zirconia In Dentistry
Cerac in lab (Sirona)System
Q: Is the fit of a zirconia coping important since the zirconia
ceramic is so strong?
A: The thicker the cement the weaker the all-ceramic restoration.
Cements are not as rigid as zirconia ceramic, so a thicker cement
layer will cause more flexural deformation of a ceramic core,
increasing the potential for fracture.
Q: Is it ok to grind on a zirconia coping without water spray?
A: Water spray is necessary when grinding on a zirconia ceramic
coping. The white light or hot spot you see between a diamond and a
zirconia ceramic has been measured at 1500 ºC. If the temperature
of zirconia ceramic rises above 1000 ºC, a phase change can occur
that will induce cracking and surface defects, lowering the
strength of the coping.
Q: Is preparation design of a zirconia coping important since the
zirconia ceramic is so strong?
A: Preparation design of the zirconia coping is very important. The
thickness of unsupported porcelain should not exceed 2 mm. The
zirconia coping should be as thick as needed to avoid unsupported