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RAW MATERIAL

Three Crystal States Of Zirconium Dioxide

Monoclinic - Until 1170 °C
Tetragonal - From 1170 °C until 2370 °C
Cubic - Above 2370 °C
CERAMICS RAW MATERIAL
  • The zirconia particles must have a tetragonal crystal structure (cubic for jewelry, monoclinic is weak)
  • The tetragonal structure is unstable in the mouth, just the right amount of stabilizing Yttria is needed (3.0 mol%)
  • Blanks must have this structure microscopically everywhere
Yttria concentration: on average 3 mol%
  • Increased aging
  • Breaking
  • Shrinkage problems
Yttria concentration: on average 3 mol% ...and 3 mol% in every particle
  • Slow aging
  • Evenly strong
  • Perfect shrinkage

KEROX 100 year lifetime warranty

Gamma Irridiaton

PRESSING: DIFFERENCE IN TECHNOLOGIES

QUALITY VS. QUANTITY
KEROX MULTI PRESSING

Kerox Dental Zirconia blanks are made Yttria stabilized on every single grain – manufactured by market leader Japanese company.

CHEMICAL PROPERTIES
IngredientsWeight percentage (%)
ZrO2 > 94.10
Y2O3 5.20
Al2O3 0.25
HfO2 < 0.30
SiO2 ≤0.02
Fe2O3 ≤0.01
Na2O ≤0.04

PHYSICAL PROPERTIES
Typical properties of sintered body
Density (g/cm3) 6.05
Bending strength (MPa) 1500
Surface hardness (HV10) 1250
Radioactivity (Bq/g) < 0.01

AXIAL PRESSING ONLY IS INSUFFICIENT
  • Pressure and mold densification are uneven
  • Different density, shrinkage, hardness
COLD ISOSTATIC PRESSING
  • Extreme pressure
  • Even densification & mass
  • Less porosity
  • Less unevenness
  • Homogeneity

KEROX DENTAL MULTI PRESSING

Cold Isostatic pressing is time-consuming but it leaves less material stress and strain, than axial press. In Kerox Dental to the axially pre-pressed blocks an isostatic manufacturing process is applied – that’s Kerox Dental Multi Pressing. The all around, extreme pressure during the isostatic pressing ensures a maximum homogenous density in all Kerox Dental blocks. Optimal blank porosity and density decrease amortization of both the milling machine and the milling heads of the dental laboratory.

 

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