Dentsply Sirona CEREC Zirconia+ Mode D'emploi page 3

3.1.1. Preparation guidelines for abutment teeth (anterior and
posterior bridges)
The preparation guidelines for abutment teeth correspond
to the guidelines for the above described crowns.
The reduction should be at least 0.7 mm at the lowest point
of the main fissure, cusps and axial wall.
Bridge design can be conventional, single abutment crowns
at each end, with no more than 2 pontics.
The cross sections of the connectors can be taken from the
table below:
Connector cross section for
Anterior bridge restoration
Posterior bridge restoration
3.2. CAD/CAM processing
CEREC® Zirconia+ restorations are produced with CEREC® or
inLab® CAD/CAM systems by Dentsply Sirona. If you have any
questions about these systems, please contact Dentsply Sirona.
3.2.1 Software Requirements
CEREC® Zirconia+ CAD/CAM blocks are supported by CEREC®
version 5.1.3 with Material Pack or higher or inLab® CAD 20.0.3
Service Pack and inLab® CAM 20.0.1 Material Pack or higher.
3.2.2 Milling the restoration
In the CEREC® software, select CEREC® Zirconia+ CAD/CAM
Block material. The Dentsply Sirona CAD/CAM milling unit will
prompt you to insert a CEREC® Zirconia+ CAD/CAM Block. For
detailed processing, please consult the Instructions for Use and
technical manuals of the appropriate CAD/CAM systems. Make
sure to follow the manufacturers' recommendations.
For CEREC® Zirconia+ CAD/CAM Blocks dry milling is recom-
mended, but, if desired, wet milling is also possible.
Wet Milling – To avoid contamination and reduced
translucency
Using wet milling, you have to be aware that contaminated
cooling water (e.g. due to residuals of glass-ceramic particles)
CAUTION
can diminish the translucency of the final restoration.
Therefore, renewal of the cooling water and cleaning of
the milling chamber and filter is strictly recommended
before wet milling. Alternatively, three separate water
tanks for glass ceramics, rinsing in-between, and
zirconia wet milling could be used.
3.3. Sintering
3.3.1. Preparation for sintering
After the milling process (and prior to sintering) a tungsten
carbide tool shall be used to separate the restoration from
the blank. Remove the sprue prior sintering.
If further adjustments are needed, it is recommended to do
the adjustments before sintering.
Airborne particles – To reduce inhalation risk
• Do not inhale abrasive dusts.
• Use a vacuum system and wear a mask.
CAUTION
3.3.2. Sintering the restoration
A Dentsply Sirona Sintering furnace (CEREC® SpeedFire, inFire HTC
speed, or inLab® ProFire) is recommended for the sintering process.
Before sintering the restoration, it is recommended to free the res-
torations from dust using compressed air or a ceramic brush.
Do not inhale abrasive dusts. Use a vacuum system and wear a mask.
NOTE: Restorations made from CEREC® Zirconia+ must be
sintered in dry conditions. Therefore, wet milled restorations
have pre-drying steps included in their sintering programs,
prolonging overall sintering time.
Sintering in the CEREC® SpeedFire
When sintering CEREC® Zirconia+ restorations in the CEREC®
SpeedFire, the CEREC® software automatically transfers the job
to the CEREC® SpeedFire if the milling machine and the CEREC®
SpeedFire are connected.
NOTE: Maximum restoration size
Observe the maximum furnace chamber size when
loading the Furnace:
- Diameter: 38 mm
- Height: 20 mm
The restoration (including the Glazing Support Single/Multi Unit)
must not exceed the size of the chamber, length (38 mm) and
height (20 mm), otherwise the chamber may be damaged.
For further information please refer to the Operating Instructions
of the CEREC® SpeedFire
1. Place the restoration with the occlusal surface facing
down directly on the top door insulation.
Minimum connector cross
section in mm
2
9
12
2. Start the process by touching the start icon.
The furnace shuts automatically once the process starts.
3. The furnace opens automatically following successful heat
treatment. The process is not yet complete, as a cooling-off
phase occurs in an open condition. There will be a signal tone
once the cooling process has completed. When the unit's
LED status display is green, the furnace can be unloaded
after approximately 30 seconds.
Risk of injury
The restoration and parts of the door insulation may
still be hot when the unit's LED status display is green.
Always use tweezers to remove the restoration from the
CAUTION
furnace. Allow the restoration to cool down for
another five minutes before picking it up with hands.
4. Only unload the furnace using metallic or ceramic tweezers.
Plastic tweezers are not suitable for removing restorations,
as the restoration is still very hot in this phase. Place the
restoration on the fireproof tray for further cooling.
inFire HTC speed:
Dry milled restorations
When sintering in the inFire HTC speed/use the
pre-programmed program "inCoris TZI/ZI speed".
Heating rate
°C/min
S4 99
S3 99
S2 50
S1 99
Wet milled restorations
When sintering in the inFire HTC speed use the
pre-programmed program "inCoris TZI/ZI speed wet".
Heating rate
°C/min
S4 99
S3 50
S2 99
S1 15
inLab® ProFire:
Dry milled restorations
When sintering in the inLab® Profire use the pre-programmed program
"CEREC® Zirconia+ speed".
Heating rate
°C/min
S1 99
S2 50
S3 99
Wet milled restorations
When sintering in the inLab® Profire use the pre-programmed
program "CEREC® Zirconia+ speed wet".
Heating rate
°C/min
S1 15
S2 99
S3 50
S4 99
Sintering CEREC® Zirconia+ with other furnaces
For sintering the restorations in furnaces from other manufacturers, fol-
low the firing parameters outlined in Tables below.
Dry milled restorations
Start Heating Temp. 1 Holding
rate 1 time 1
°C °C/min °C min
RT 99 800 5
Wet milled restorations
Start Heating Temp. 1 Holding Heating Temp. 2 Holding
rate 1 time 1 rate 2
°C °C/min °C min °C/min
RT 15 80 30 99 800
Holding Holding
temperature/°C time/min
750
1510
1510
800
Holding Holding
temperature/°C time/min
750
1510
800
80
Holding Holding
temperature/°C time/min
800
1510
750
Holding Holding
temperature/°C time/min
80
800
1510
750
Heating Temp. 2 Holding Cooling Temp. 3
rate 2 time 2 Rate
°C/min °C min °C/min
50 1510 30 99
Heating Temp. 3 Holding Cooling
time 2 rate time 3 Rate
°C min °C/min °C min °C/min
5 50 1510 30 99
0
0
30
5
0
30
5
30
5
30
0
30
5
30
0
Action
°C
Open
door
750
Temp. 4 Action
°C
Open
door
750
3