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Idiomas disponibles
E n g l i sh
Material properties
CTE
10.5 ± 0,5 * 10
( 100 – 550 °C / 212 – 1022 °F )
Flexural strength
1)
≥ 900 MPa
2)
Chem. solubility
< 100 µg/cm
2
Chemical composition
zirconium oxide (ZrO
yttrium oxide (Y
hafnium oxide (HfO
aluminum oxide + other oxides
Type / Class
Type II / Class 5
1)
according to ISO 6872:2015
2)
typical values for flexural strength are 1150 ± 150 MPa
I ndic atio ns
Zenostar
MO (Medium Opacity) consists of machinable zirconia discs
®
for the preparation of full ceramic crowns, onlays and bridges (anterior
and molar).
I ntended u s e
Zenostar MO are milling discs intended for the fabrication of crown
frameworks and multi-unit * bridge frameworks for use as dental
restorations.
Safety i n fo r ma t io n s
Before you remove the zirconia disc from its packaging, please read these
instructions through carefully. They include important information about
working with the Zenostar MO discs and are intended for your safety and
the safety of your patients.
Caution:
Processing Zenostar MO discs gives rise to dust which can irritate
the eyes and skin and harm the lungs. Ensure that the milling
machine and the workplace are fitted with an adequate and fully
functional air extraction system. Wear goggles and a face mask
(particle class FFP2).
G eneral in s t r uc t io n s o n ha nd li ng
Zenostar MO discs are supplied pre-sintered. In this state the material
is easy to work with but does not yet have the familiar properties
associated with the finished dental restoration. It must therefore be
handled with care.
Please check immediately on receipt that:
The packaging is intact
The product shows no signs of damage
(there should be no visible chipping, cracking or discoloration)
The packaging bears the name Wieland as manufacturer
and shows the CE mark
Ideally, the Zenostar MO disc should be stored:
In its original packaging
In a dry place
When handling the Zenostar MO disc:
Ensure that it is not subjected to shock or vibration
Do not touch with wet hands
Only allow the disc to come into contact with liquids approved for
use with the product. (Unsuitable liquids include tap water, adhesives
and marking inks.)
Do not allow the product to be contaminated by foreign particles
(e.g. glass ceramic dust, metal machining dust)
If any of these points are not observed, the Zenostar MO discs must not
be used for making dental restorations.
I ns truc tio ns f o r d e n t is t s
In order to guarantee a top quality restoration which will deliver long-term
satisfaction for the patient, a high-quality material must be prepared and
processed in a professional manner. You can ensure maximum safety and
satisfaction for your patient by following the following recommendations:
No preparations with corners or sharp edges Shoulder-type
preparation with a rounded inner edge or a chamfer-type preparation
Depth of cut at least 1 mm at the prep margin
Remove 1.5 – 2 mm of occlusal / incisal tooth substance
Edge radius: 0.7 mm
Prep angle: 6 – 8 ° for conventional cementation,
> 6 ° when using an adhesive
No more than two pontics may be placed between
any two abutment teeth
The work can be cemented conventionally with phosphate or glass
ionomer cement. Recommended materials for adhesive fixing are Multilink
Automix for self-adhesive fixing or SpeedCEM
Vivaglass
®
CEM PL from Ivoclar Vivadent. More information can be
found in the detailed Zenostar instructions for use or the Cementation
Navigation System of Ivoclar Vivadent.
www.cementation-navigation-system.com
Furthermore, you should be sure to observe the following:
Contraindications
More than two adjacent pontics
Very deep subgingival preparations
Patients with inadequate natural dentition
Bruxism for veneered structures
Two or more adjacent cantilever units
I nst r uc t ions f o r u s e Zen o s t ar
All other applications which are not included in the indications
Insertion as a provisional restoration
K
-6
-1
Additional constraints
Successful results cannot be guaranteed if the guidelines given below
+ HfO
Y
O
) ≥ 99 %
+
are not observed when working with Zenostar MO, e.g. in the event of:
2
2
2
3
O
)
> 4.5 – ≤ 6.0 %
2
3
)
≤ 5 %
Inadequate thickness of connector(s) or framework
2
≤ 1.0 %
Using an incompatible CAD/CAM system to mill the discs
(dry milling only).
Sintering in an incompatible high-temperature furnace
I ns tr uc ti on fo r d e n tal la b or at or ie s
Framework design parameters for Zenostar MO
Anterior region
Crowns
Splinted crowns
3-unit bridges
Bridges with 4 or
more units and
2 pontics*
Bridges with one
cantilever unit
Posterior region
Crowns
Splinted crowns
3-unit bridges
Bridges with 4 or
more units and
2 pontics*
Bridges with one
cantilever unit
Framework design parameters for Zenostar MO
for the IPS e.max CAD-on technique
Anterior and
posterior region
Crowns
Splinted crowns
3-unit bridges
Bridges with 4 or
more units and
2 pontics*
* In Canada, bridge indications are limited to no more than 6 units
with no more than 2 adjacent pontics.
In addition, the following points should be observed:
Frameworks to be veneered must be designed in such a way as to
provide support for the veneering ceramic in the area of the cusps so
that the veneer can be applied in a layer of fairly uniform thickness.
If the framework design criteria, e.g. minimum wall thickness and
minimum cross-section of connectors, are not met, this can result in
clinical failure (e.g. the restoration may fracture).
When designing pontics, the type of subsequent finishing must be
taken into account.
When designing connectors, it is not only necessary to ensure that the
surface area of the cross-section is adequate but also to pay attention
to the ratio of the width to the height: height ≥ width.
Notes on finishing Zenostar MO (restorations can be found in the
detailed Zenostar instructions for use and in the Download Center at:
www.wieland-dental.de
M il li ng th e di s cs
Once they have been removed from the packaging, the Zenostar MO discs
are immediately ready to be milled in a Zenotec milling machine. Their
diameter of approx. 98 mm means that both large-span restorations and
several smaller items can easily be made from a single disc.
The use of other machines, equipment or instruments can impair the
®
quality of the restoration. During dry milling, Zenostar MO discs may
for conventional fixing
®
only be blasted with oilless compressed air. Please observe the guidelines
given in the operating instructions for your milling machine.
Once milling is complete, the Zenostar MO restorations should be
inspected carefully and must fulfill the following criteria:
There should be no visible discoloration
The material should show no signs of chipping
No cracks should be visible
If any of the defects listed above are present, the work must not be
used for making a dental restoration.
Please ensure that frameworks are clean and free of milling dust before
sintering. Remove any dust with a soft brush.
Minimum wall
Connector
thickness
cross-section
Design type
in mm
in mm
2
0.4
–
0.6
7
Should support
tooth shape /
0.6
7
gingiva (incisal,
occlusal or
0.6
9
basal)
0.7
12
Minimum wall
Connector
thickness
cross-section
Design type
in mm
in mm
2
0.6
–
0.6
9
Should support
tooth shape /
0.6
9
gingiva (incisal,
occlusal or
0.7
12
basal)
0.7
12
Minimum wall
Connector
thickness
cross-section
in mm
in mm
2
0.5
–
0.5
7
0.5
9
0.5
12
M O
®
H a rd s in te ri n g th e fr am e wo rks
Hard sintering is an essential process in which the Zenostar MO
restorations undergo a precisely defined heat treatment process. Only
then does the restoration possess the required strength to ensure the
safety and high clinical performance during intra-oral wear. During the
hard sintering process, the framework shrinks to its final dimensions.
Further information about the sintering process can be found in the
detailed Zenostar instructions for use.
Prior to sintering, the restorations must be completely free of milling dust.
Please refer to the detailed Zenostar instructions for use on the procedure
and relevant recommendations. If the framework comes into contact with
liquids, it must be dried before sintering. Moist frameworks must not be
sintered. The drying time depends on the temperature and the size of the
framework. When drying the frameworks, a temperature of 140 °C (284 °F)
must not be exceeded.
General principle:
Ideally, sintering should be carried out in the Programat S1 sintering
furnace from Ivoclar Vivadent or in the sintering furnaces of the
Wieland Zenotec system. The sintering programs recommended by
Wieland Dental are given in the detailed Zenostar instructions for
use. The RFID label must not be sintered along with the disc. If this area
of the disc has to be sintered, the label must be removed completely.
Fin i sh in g t he fra me w or ks
When finishing the cooled, hard sintered Zenostar MO frameworks,
please proceed as follows:
Any finishing carried out on sintered Zenostar MO frameworks should
be kept to a minimum.
The restoration should only be subjected to mechanical trimming if this
is absolutely necessary.
Place the Zenostar MO framework on the model, check the fit and
make minor adjustments if necessary.
Check the margin areas and make any minor adjustments that may be
necessary.
Apply only very gentle pressure when finishing, since chipping may
otherwise occur at the margin and this could result in damage to the
final restoration. The thinner the wall is, the more caution is required.
Be sure to observe the instructions issued by the manufacturer of the
abrasive instruments used.
Avoid sharp edges and strive to achieve a rounded effect.
Under no circumstances should cutting discs be used to separate the
bridge framework after sintering, since this could create potential
breakage points which would weaken the final all-ceramic restoration.
Ensure that the minimum thicknesses are still present after finishing.
When selecting the abrasive instruments, please observe the
recommendations applicable to abrasives.
Only use abrasive tools which are in perfect condition. Instruments
with reduced cutting power generate heat. Ideally, use tools with a
grain size of < 30 μm.
Check your work for flaws and cracks before and after carrying out any
finishing work.
Any milling dust sintered onto the surface of the restoration must be
removed before veneering.
Before veneering, rinse the framework under running water or clean
with a steam jet. Then dry the work.
R eg e ne ra ti o n fi ri n g ( o pt io n al )
Finishing of sintered Zenostar MO frameworks should be kept to a
minimum.
A regeneration firing is only recommended after:
Finishing a large area of the surface of the framework (e.g. removal
of cusps, reduction of the layer thicknesses).
The use of abrasive instruments which are not listed in the recom-
mendations for abrasive instruments (see detailed Zenostar instruc-
tions for use).
Grinding with diamond abrasives (grit size > 100 μm).
Please note: Carrying out a regeneration firing can not "cure" cracks in
the Zenostar MO framework caused by coarse finishing, e.g. sandblasting
at an excessive pressure.
This material has been developed solely for use in dentistry and must be
processed according to the Instructions. Liability cannot be accepted for
damages resulting from misuse or failure to observe the Instructions. The
user is solely responsible for testing the material for its suitability for any
purpose not explicitly stated in the Instructions. This also applies when
the materials are mixed with or used together with products from other
companies.
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