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Idiomas disponibles
E n g l i s h
I n t e n d e d u s e
ZENOTEC Al
are milling blanks, which are intended to be used
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in fabricating:
Frameworks of single Crowns (anterior / premolars)
Primary parts (anterior / premolars)
The frameworks for single Crowns have to be veneered for its
application. The finished single Crowns are intended to be used
on natural teeth or implant restoration. The primary parts can
only be used on natural teeth.
S a f e t y f i r s t
Before you remove the aluminium oxide blank from the packaging,
please read the instructions for use carefully. They contain important
information to ensure your safety when working with ZENOTEC Al
and for the safety of your patients.
Important:
During processing ZENOTEC Al
give off dust which can
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cause irritation to the eyes or the skin or damage to the lungs. It
is essential therefore to ensure that the dust extraction system
of your milling machine is working correctly. Wear protective
goggles, gloves and a face mask (particle class FFP2).
ZENOTEC Al
are manufactured and tested to the highest standards
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of quality. In order to pass on this quality to the patient, it is absolutely
essential to follow the processing instructions given in this document.
This will avoid any deterioration in the quality of the denture in terms
of the appearance, fit and life of the restoration.
G e n e r a l h a n d l i n g i n f o r m a t i o n
The ZENOTEC Al
are supplied partly sintered. The do not yet have
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the familiar outstanding properties which they will have as finished
dentures. They therefore require careful handling.
Please check the delivery immediately after receipt:
Ensure that the packaging is intact.
Ensure that the product is in good order.(There should be no visible
flaking, cracks or irregular colouring)
Look for the ZENOTEC Quality Code (ZQC) and name of the manufac-
turer WIELAND on the packaging
ZENOTEC Al
should be stored
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at a constant temperature
in the original packaging
in a dry place
at between 5 °C and 50 °C
When handling the ZENOTEC Al
:
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Do not allow them to be subjected to shock or vibrations
Avoid touching them with wet hands
Do not allow them to come into contact with liquids of any kind
(e.g. water, adhesives or marking inks)
Keep them clean
The ZENOTEC Al
may only be used for the fabrication of dental
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restorations if the contents of these instructions for use have been
observed in full.
N o t e s f o r d e n t i s t s
In order to ensure a top-quality dental restoration which will give
lasting patient satisfaction, a high-quality material must be backed by
professional preparation and processing. For maximum safety and the
best possible patient satisfaction, follow the recommendations below:
Prepare the tooth with a pronounced chamfer or rounded shoulder
Depth of cut at the preparation margin at least 1 mm
Remove 1.5 – 2 mm of occlusal / incisal tooth substance
Angle of preparation: 6° – 8°
The finished work should be fixed in place with a glass ionomer cement
or adhesive composite cements. If an adhesive is used, WIELAND recom-
mends the product RelyX Unicem from 3M ESPE or Panavia 21 TC /
Panavia F 2.0 TC from KURARAY. The inner surfaces of the ZENOTEC
Al
frameworks should be blasted with aluminium oxide abrasive
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powder with a grain size of max. 50 µm. The blasting pressure should
not exceed 2.5 bar. Please refer to the ZENOTEC preparation guide for
detailed information.
Temporary cementation is contraindicated, since the restoration may
be damaged during removal.
The use of glass ionomer cements modified with synthetics, compo-
mer cements and all cements with a high coefficient of expansion
is currently contraindicated since no results of long-term studies
are available.
C o n t r a i n d i c a t i o n s
In common with all full-ceramic restorations, aluminium oxide
frameworks are not suitable for patients suffering from bruxism.
In cases where space is restricted or the preparation is unsuitable,
an alternative form of restoration should be chosen.
N o t e s f o r d e n t a l t e c h n i c i a n s
When designing Crowns, observe the following minimum values:
Minimum wall thickness: 0.6 mm
The design should support the veneer in the area of the cusps
to ensure that the veneer can be applied as evenly as possible
in these areas.
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Generally avoid sharp edges
M i l l i n g t h e D i s c s
Once they have been inspected, the ZENOTEC Al
processing in a ZENOTEC milling machine. The diameter of approx. 98 mm
enables work for a variety of applications (within the area of indication)
to be positioned within a single Disc. Careful positioning of the work
enables the ZENOTEC Al
to be used to maximum efficiency.
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Only such machines, equipment and tools as are distributed by
or approved by WIELAND may be used for making dentures from
ZENOTEC Al
.
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If other machines, equipment or tools are used, then no guarantee
can be given in respect of the frameworks made in this way.
ZENOTEC Al
may only be milled with the diamond burs approved
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for the purpose. In order to obtain the best results, the setting "tool
optimized milling" under the heading "NC calculation" must not be
selected in the CAM module (ZENOTEC CAM Version 3.2 or higher) after
the blank has been inserted.
When milling in one of the machines indicated, the ZENOTEC Al
must not be allowed to come into contact with coolant or compressed
air. Please also follow the instructions in the user manual of your mil-
ling machine.
Damaged or contaminated ZENOTEC Al
fabrication of dental restorations.
The milled ZENOTEC Al
frameworks must be carefully trim-
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med from the disc using suitable tools and then subjected to a
visual inspection to ensure that they fulfil the following criteria:
There is no visible discolouration
There is no evidence of flaking
There are no visible cracks
If any of these flaws are present, the framework must not be used
for the fabrication of a dental restoration.
H a rd s i n t e r i n g o f f r a m e w o r k s
Hard sintering is a necessary process in which the ZENOTEC Al
framework is subjected to precisely defined heat treatment. The
framework attains the strength required to ensure the safety and
performance demanded by the clinical application only after sintering.
During hard sintering the framework shrinks to its final dimensions. This
heat treatment plays a significant part in achieving a perfect fit.
Before sintering commences, the frameworks must be completely free of
milling dust.
Hard sintering is carried out in the ZENOTEC Fire sintering furnace at a
temperature of 1,580 °C for 2 hours. The sintering parameters must be
set in accordance with the specifications in the operating instructions of
the ZENOTEC Fire high temperature furnace and must not be changed.
F i n i s h i n g t h e f r a m e w o r k s
Any work carried out on the frameworks should be done immediately
after milling whilst they are still white. For this purpose, use SiC abrasi-
ves at approx. 10,000 rpm and / or the preferred diamond instruments
(medium – coarse grain) at approx. 15,000 rpm. The work must be
carried out with great care and without exerting undue pressure.
The hard sintered ZENOTEC Al
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ted to mechanical processing if this is absolutely necessary. For this pur-
pose only such diamond instruments as have been approved for the use
with hard sintered aluminium oxide may be used. Finishing and polis-
hing should be carried out with silicon-bound diamond abrasives. As
a rule, only the absolute minimum amount of force should be applied.
Improper processing or the use of abrasive instruments which have not
been approved for the use with aluminium oxide can cause flaws such
as flaking or cracks in the framework.
Please always follow the instructions for use issued by the
manufacturers of the grinding equipment and the abrasive tools.
You can use the ZENOTEC Light to inspect your work for flaws and
cracks both before and after processing.
Flawed frameworks must not be used to make dental restorations.
The following rules should be observed:
The thinner the wall of the restoration, the more care must
be taken. As a general rule, the wall thickness of full-ceramic
dentures should not be less than 0.6 mm.
Do not use excessive force when removing material; apply only
gentle pressure.
Use only abrasive instruments which are in an immaculate
condition. A reduction in cutting power generates heat.
For finishing the edges or for fine adjustments to the surface
(polishing), use only diamond burs which are specifically suitable for
the purpose at the speed recommended by the manufacturer.
Refrain from grinding the interdental connectors and in particular do
not cut any notches or incisions in the base.
Avoid sharp edges and aim for rounded contours.
Ve n e e r i n g o f t h e f r a m e w o r k s
For best results we recommend veneering the hard sintered ZENOTEC
Al
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are ready for
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WIELAND. Please follow the instructions for use issued with ALLUX.
M a t e r i a l p ro p e r t i e s a n d f o r m s o f s u p p l y
Typical properties of the hard sintered ZENOTEC Al
Colour
Density
Open porosity
Vickers hardness
Bending strength
E modulus
Fracture toughness
CTE (25 – 500 °C)
Composition
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ZENOTEC Al
must not be used for the
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Forms of supply of ZENOTEC Al
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frameworks should only be subjec-
frameworks with the ALLUX veneering ceramic from
material.
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ivory
> 3.9 g/cm
3
0 %
1650 HV
10
360 MPa
380 GPa
3.5 MPa . m
1/2
7.3 . 10
-6
/ K
-1
Aluminium oxide (Al
O
)
2
3
Other oxides
are suitable for intra-oral use and biocompatible.
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10
69 08 00 11 00
98
> 99.5 %
< 0.5 %
0483
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