Ivoclar Vivadent Zenostar - Manual (Page 7)

7
Area of application
Indications
Zenostar are milling discs designed for the manufacture of single-tooth and multiple-unit restorations * used for tooth replacements.
Depending on the indication, Zenostar is suitable for the construction of frameworks and monolithic (full-contour) restorations.
Translucency
level
Indications
Crown
frameworks
Interlocked
crown
frameworks Multi-unit
bridge
frameworks
*
Primary
telescope
crowns
Full-contour
crowns
Full contour,
interlocked
crowns Full- contour,
multi-unit
bridges
*
Zenostar T
      
Zenostar MO
   
*In Canada, bridge indications are limited to no more than 6 units with no more than 2 adjacent pontics.
Contraindications
More than two connected pontics
Very deep subgingival preparation
Patients with severely reduced residual dentition
Veneered Zenostar T/MO restorations are not suitable for patients suffering from bruxism.
Two or more unsupported cantilever units
Any other use not listed in the indications
Temporary insertion
Additional limitations of use
Failure to observe the following restrictions may compromise the results achieved with Zenostar:
failure to observe the necessary minimum connector and minimum framework thicknesses
milling of the discs in non-compatible CAD/CAM units (only suitable for dry machining)
sintering in a non-compatible high-temperature furnace
Composition
Zirconium oxide (ZrO
2
+ HfO
2
+Y
2
O
3
) ≥ 99 % 10.5 ± 0.5
Yttrium oxide (Y
2
O
3
) > 4.5 – ≤ 6.0% ≥ 900
Hafnium oxide (HfO
2
) ≤ 5% ≥ 5.0
Aluminium oxide + other oxides ≤ 1.0 % <10
Type / Class Type II / Class 6