Dentsply Sirona CEREC Zirconia+ Mode D'emploi page 4

3.3.3. Adjustments of sintered restorations
Surface Condition – To reduce risk of compromised
flexural strength
The surface condition of ceramic materials is critical
for their flexural strength. Adjustment of the sintered
CAUTION
restorations with milling tools, especially in the connector
area, must be avoided.
However, if adjustment is necessary, then follow these basic rules:
• Adjustment in the sintered state should be performed with fine
diamonds in a highspeed handpiece with water cooling and
with low pressure. Adjustments made with diamonds instru-
ments must be followed by polishing.
• As an alternative it is possible to do adjustments with soft dia-
mond rubber polishers and a handpiece at low speed and low
pressure. The tool must be applied flat to minimize the chatter.
• Areas that are under tension in clinical use, i.e. primarily the
connectors in bridge structures, should not be adjusted.
3.4 Polishing, Try­in and optional Staining and Glazing
CEREC® Zirconia+ restorations can either be polished,
or polished and glazed.
3.4.1 Polishing
• CEREC® Zirconia+ can be polished with standard polishing
agents for zirconia ceramics.
• Subsequent heat treatment (depressurization fire) is not
necessary/recommended.
• The MEISINGER LUSTER® Kits for Zirconia are recommended
for polishing the restoration.
1. 9735H: Trimming the contact points,
Recommended rotary Speed: 8.000 – 12.000 rpm
2. DCA06: Smoothing of the external shape,
Recommended rotary Speed: 7.000 – 12.000 rpm
3. 9771M*: Polishing of the occlusal surfaces,
Recommended rotary Speed: 7.000 – 12.000 rpm
4. DCA12: High-shine polishing of the external shapes,
Recommended rotary Speed: 7.000 – 12.000 rpm
5. 9771C*: High-shine polishing of the occlusal surfaces,
Recommended rotary Speed: 7.000 – 12.000 rpm
*Note: To be used with little contact pressure!
For further information please refer Instructions for Use of the
MEISINGER LUSTER® Kits. Meisinger is not part of Dentsply Sirona.
3.4.2 Optional Try-In
• Try-in the restoration for marginal and proximal fit. Make any
necessary adjustments as outlined above.
Contamination – To reduce risk of infection
Restorations should be polished, cleaned and disinfected
before and after optional try-in. See Hygiene section below.
CAUTION
• Adjustments made during try-in must be re-polished as
outlined below prior to
optional stain and glaze application and final delivery.
3.4.3 Optional Staining and Glazing
Surface Condition – To reduce risk of excessive wear
• Prior to glazing, ensure restorations are properly
sintered and polished.
• Restorations must be clean and dry before application.
CAUTION
CEREC® Zirconia+ restorations can be glazed with: Dentsply Sirona
Universal Stain and Glaze, Dentsply Sirona Universal Spray Glaze, or
Dentsply Sirona Universal Spray Glaze Fluo.
First, follow the polishing instructions from Section 3.4.1.
After polishing, clean the restoration using either an ultrasonic clean-
er or steam cleaner, prior to Spray Glaze or paint-on application. En-
sure the restoration is free of contami-nation and completely dried
with oil-free air prior to paint-on or Spray Glaze application.
Preparation of the restoration for Staining and/or Glazing
Use the Glazing Support Single/Multi Unit holders, and CEREC®
SpeedPaste as shown in the images below. Fill the restoration
with CEREC® SpeedPaste, applying the paste evenly up to the
restoration margin. Place the Glazing Support Single/Multi
Unit holders in the paste and pick up the tweezers, if required.
Observe the operating instructions supplied with the CEREC®
SpeedPaste.
Glazing with Dentsply Sirona Universal Spray Glaze or
Dentsply Sirona Universal Spray Glaze Fluo
1. Pick up the support with the restoration using tweezers.
2. Shake the spray can vigorously immediately before applying.
3. Maintain a distance of 6 – 10 cm (2.5 – 4.0 in) between the
nozzle outlet and the restoration surface.
4. Spray on an even coat of Dentsply Sirona Universal Spray
Glaze or Dentsply Sirona Universal Spray Glaze Fluo from all
sides directly onto the (stained) restoration. Shake the spray
can vigorously between individual sprays.
5. Apply a uniform layer glaze to the surface of the restoration.
The applied glaze should be thin and uniform.
6. Ensure the intaglio surface of the restoration is free of glaze.
If the glazing material is present on the intaglio surface of the
restoration, remove it with a dry, stiff, short-bristled brush.
7. Keep the can as upright as possible during the spraying process.
8. Wait for a few seconds until the glaze dried and displays an
even, whitish coating. Apply more spray as required.
9. If another application of spray is necessary after the firing,
the spraying and firing can be performed once more in the
same way.
Refer to Instructions for Use (IFU) of Dentsply Sirona Universal
Spray Glaze/Dentsply Sirona Universal Spray Glaze Fluo for fur-
ther details.
NOTE:
• If characterization is desired, the stains must be applied prior
to application of Spray Glaze.
• The Use of Dentsply Sirona Universal Spray Glaze Fluo may
lead to a brighter shade. Use Dentsply Sirona Universal Spray
Glaze if this effect is not desired (see complete Instructions for Use).
Glazing with DS Universal Stain and Glaze
1. Withdraw desired amount of DS Universal Glaze from the jar
and place it on the mixing palette.
NOTE: If the stain or glaze inside the jar has separated,
mix thoroughly with a glass, plastic or zirconia spatula.
2. If a thinner consistency is desired, dilute the material with
the Dentsply Sirona Stain and Glaze Liquid (REF 601315/15 ml,
601350/50 ml).
3. Apply a thin layer of the glaze material all over the crown
surface in the usual manner using a brush. Make sure not to
apply the glaze material too thick or too thin. Too thin of a
layer will result in a more matte finish. To thick layers lead to
bubbles on the surface.
4. If a more intensive shade effect is desired, DS Universal Stains
can be applied on the glazed surface of the restoration. Apply
a thin layer of the stain material on the crown surface in the
usual manner using a brush. Make sure not to apply the glaze
material too thick or too thin.
Refer to Instructions for Use (IFU) of Universal Stain & Glaze
for further details.
3.4.4. Glazing the Restoration in the furnace
NOTE: A restoration can be glazed a max of two times in the furnace.
Glazing CEREC® Zirconia+ in the CEREC® SpeedFire
Glaze restorations individually and do not glaze multiple
restorations at the same time. Position the Support with
the restoration centrally on the top door insulation and
ensure that the Glazing Support Single/Multi Unit or res-
toration do not protrude out from the door insulation;
otherwise, these may collide with the furnace chamber.
Two different glazing programs are available. Select the
"GLAZING (Spray)" program for use of DS Universal Spray Glaze
and DS Universal Spray Glaze Fluo or "GLAZING (Stain & Glaze
Paste)" program for use of DS Universal Stain and Glaze on the
CEREC® SpeedFire control panel and allow the unit to cycle.
NOTE: Using DS Universal Stain & Glaze for crowns and bridges
preheating to 400°C is recommended.
Choose the right Glazing program
• Choosing the wrong glazing program may lead to
damage of the restoration or CEREC® SpeedFire.
CAUTION
For further information please refer to the Operating Instructions of
the CEREC® SpeedFire.
Glazing CEREC® Zirconia+ with other furnaces
For firing the restoration in furnaces from other manufacturers,
follow the firing parameters outlined in Table below.
Drying Closing Pre­heat­ Pre­
ing tem­ heating
perature
min min °C min
0 2 400 0
3.5. Pre­Cementation Surface Preparation
• Sand-blast the internal surface of the restoration using 50 µm
aluminum oxide at a max pressure of 2.5 bar (35 PSI).
• Clean and disinfect the restoration as outlined in Hygiene
section below.
Contamination – To reduce risk of infection
Restorations should be polished, stained and glazed
(optional, if desired) and sandblasted internally before
cleaning and disinfection.
CAUTION
Restorations should be cleaned and disinfected
immediately prior to delivery. Follow instructions
in Hygiene section below before delivery.
Heating Final Vacuum Holding
rate tempera­ time
ture
°C/min °C min min
55 760 0 2:00
Cooling
min
0
4