ZIRCONIA & ITS RELEVANCE IN DENTISTRY

Popularly known as ‘Ceramic Steel’, Zirconia (ZrO2) or Zirconium Oxide is a non-metallic inorganic mineral belonging to the group of oxide ceramics. It can be partially stabilized by Yttrium and enriched with Aluminium to improve its structural properties. Zirconia possesses high bending strength, hardness and toughness. It's unique combination of excellent mechanical & chemical properties makes it an ideal bio-material. It can also be bonded with metal to make a ceramic-metal crown. Zirconia based restorations are quite versatile and can be used for crowns, bridges, and implant abutments in a variety of clinical situations. High strength and high aesthetics of zirconia make it an excellent option in dental restoratives & implants.

Favorable Properties of Zirconia

  • Non-magnetic and corrosion resistant.
  • High flexural strength 600-1200 MPa.
  • Low thermal expansion.

Physical Properties

Colour - White
Surface Finish - Smooth
Condition - Solid Block
Odor - None
Melting Point oC 2680
Boiling Point  oC 5500
Ignition Point - Non-flammable
Pre Sintered Density  g/cm3 3.00 ± 0.2
Final Sintered Density  g/cm3 6.08 ± 0.2
Solubility after final Sintering - Non soluble
Radioactivity  Bq /g < 0.01
Flexural Strength MPa > 1000
Grain Size µm < 0.5
Thermal Expansion  10-6/K 9.71
Fracture Toughness  MPa m0.5 8.05
Young`s Modulus  Gpa 210
Open Porosity  % 0
Chemical Solubility  µg.cm2 < 100
Bulk Modulus  Gpa 81
Shear Modulus  Gpa 184
Modulus of Rupture  MPa >1500

 

Chemical Properties Wt%

ZrO2+ HfO2 + Y2O3 + Al2O3 >99.9
Y2O3 5.15 (± 0.20)
Al2O3 0.25 (± 0.10)
SiO2 < 0.02
Fe2O3 < 0.01
Na2O < 0.04
Grade Jyodent® Iso pressed White Opaque Zirconia Disc (IS-ZD) Jyodent® Iso pressed Translucent Zirconia Disc 
(IS-TR-ZD)
Jyodent® Iso pressed Extreme Translucent Zirconia Disc
(IS-ETR-ZD)

Jyodent® Iso pressed Translucent coloured (preshaded) Zirconia Disc (IS-TR-CZD)

Physical Properties
Sintering Temp oC 1450 1450 1450 1450
Transmittance % as per Shimadzu spectrophotometer UV2600 35.0 37.5 42.0 36.5
Transmittance % as per Haze Meter 41.6 44.6 49.0 43.4
Bending Strength (MPa) - 3 - Point 1200 >1000 >600 >1000
Sintered Body Density (g/cm3) 6.1 6.1 6.1 6.1
1mm Thickness

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Bulk enquiries are welcome in private label for Zirconia Discs & Blanks