The quality control of HTC - Bioceramics Division starts from the selection of the most pure available raw materials which combined with the consolidated know how in the sector allows us to obtain the basic component material with the highest chemical and physical properties.
Having a tight control of the manufacturing cycle the Zircox-Yd blanks are manufactured assuring a safe product compliant with ISO (International Standards Organization) and 93/42 EEC having the Class IIa CE homologation ( ).
Chemical and Physical properties
Zircox-Yd blanks are produced and tested under the International Standards Organization:
- ISO 6872 Second Edition 01-09-1995 Dental Ceramic
- ISO 6872 Amendment 1, 01-12-1997 Dental Ceramic Amendment 1
- ISO 9693 Metal-ceramic dental restorative systems
- ISO 13356 First Edition 15-09-1997 Implants for surgery - ceramic materials based on Yttrium stabilized tetragonal Zirconium (Y-TZP)
Zircox-Yd – Blank is manufactured according to ISO 13356:1997 requirements
| Trade name |
Zircox-Yd |
| Chemical composition |
ZrO2+HfO2+Y2O3 |
| Purity (Zr-Y-Hf) |
99,9% |
| Colour |
bianco |
| |
|
| Chemical Properties |
Zircox-Yd (% weight) |
| |
|
| ZrO2 |
< 96 |
| Y2O3 |
> 4 |
| Al2O3 |
< 1 |
| SiO2 |
< 0,02 |
| HfO2 |
<1 |
| |
|
| Physical Properties |
Unit |
| |
|
| Density (pre-sintered) |
~ 3,1 (g/cm3) |
| Density (dense sintered) |
~ 6,05 (g/cm3) |
| Flexural breaking strength (pre-sintered) |
~ 55 Mpa |
| Flexural breaking strength (dense sintered) |
~ 900 -1200 Mpa |
| E-modulus (dense sintered) |
~ 210 Gpa |
| Vickers hardness - HV10 (dense sintered) |
1200 |
| Open porosity |
0 % |
Chemical durability
Chemical durability is the most important property requirement for all the dental materials due to presence of wide range of temperature, PH values and chemical agents which could degrading them in the oral cavity.
In general the dental ceramics are considered to be the most inert dental materials used for dental restorations and according to Anusavice’s research, the ceramics are the most durable dental materials.
Zircox-Yd Blank - Chemical durability according to ISO 6872
| |
Chemical solubility (μg/ cm2) |
Limit value according to standard (μg/ cm2) |
| Zircox -Yd |
10 |
< 100 |
The chemical solubility of Zircox-Yd is far below the limit value according to ISO standard.
Radioactivity
The radioactivity of Zircox-Yd blank value of 0,005 Bq/g is far below the maximum value of 1,0 Bq/g permitted by ISO 6872.
Biocompatibility of Yttrium stabilized Zirconium Oxide
None of the medical tests implemented into vitro and into vivo, in short and long term implementation, showed a potential of Zircox-Yd blank to cause adverse health effects.
Conclusions
Based on the current data and today’s level of knowledge and experience, no toxic potential can be attributed to Zircox-Yd blank. To avoid any risks to the health of patients, dental technicians and dentists the Zircox-Yd blank must be used according to HTC - Bioceramics Division “Instructions for Use” sheet.
For a complete overview of Zircox-Yd properties and features refer to HTC - Bioceramics Division “Instructions for Use” and “Safety Data” sheets.
The above published information have not the meaning of guarantees on properties and do not dispense the user to follow all the local rules and laws regulating its activity.
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