Dentsply Sirona Celtra Duo Mode D'emploi page 3

Third Glaze (optional): If after firing the required glaze
appearance is not achieved, re-apply glaze over the
entire unit, and fire following 2nd & subsequent glaze
firing program in Table 1.
Instructions for optional staining and glaze-fir-
ing of Celtra Duo CAD/CAM restorations
Custom staining and glazing of Celtra Duo restorations
can be performed using Dentsply Sirona Universal
Stains and Overglaze instructions below.
• For best results, any sanding marks on the surface
should be removed with a suitable ceramic-coated
rubber polishing wheels or polished smooth at
moderate speed (not exceeding 8,000 rpm). The
setting of the furnace parameters depends on the
type of furnace, so the programming may vary
slightly.
Procedure: For Dentsply Sirona Universal Stains
and Overglaze application the following steps
must be observed:
1. Before applying the stains and glaze, the restoration
must be clean and free of grease. Clean the surface
of the restoration with a steam cleaner or submerge
for 10 minutes in an ultrasonic cleaner with distilled
water. Any contamination after cleaning must be
prevented.
2. Place the cleaned crown on the prepared DENTSPLY
Prosthetics die material. To achieve the correct
shade, prepare the die material according to the
shade recommendations in a Table 2 below.
Table 2. Recommended Die Material Selection
Shade A1 A2 A3 A3.5
Die Material F1 F12 F10 F9
3. Mix the mass thoroughly with spatula. Do not use a
metal spatula. Withdraw desired amount of Dentsply
Sirona glaze and place it on the mixing palette. For a
thinner consistency dilute the material with Dentsply
Sirona Universal Stain and Overglaze Liquid.
4. Apply a thin layer of glaze to the entire crown
surface using a brush. Apply a thin layer of stain in
the gingival area and spread with a brush toward the
incisal region (or as needed). Check the shade using
the shade tab. Use the brush to increase or decrease
the stain amount to achieve the desired shade.
5. Again using the brush, apply a thin layer of incisal
stain to the incisal edge. Check the shade using the
shade ring. Use the brush to increase or decrease the
stain amount to achieve the desired esthetic incisal
effects.
Notes:
• A more intensive shade effect can be achieved by
repeating cycles of applying and firing the material.
However, the use of too many layers of stain may
result in an unnatural appearance.
• The cusps and fissures can be individually character-
ized with stains.
• The basic shade is determined based on the Vita
shade groups (A, B, C, D) (see Table 3).
Table 3. Celtra Duo Body & Enamel Stains
Recommendations for Celtra LT Blocks
Shade Block Body Stain
A1 A1 A wash of Stain 1, or just
glaze
A2 A2 A wash of Stain 1, or just
glaze
A3 A3 A wash of Stain 1, or just
glaze
A3.5 A3.5 A wash of Stain 2, or just
glaze
1st firing: Stain i1 wash over
A4 A3.5 the entire crown, including
incisal area
2nd firing:
Body: 50/50 mix of Sunset
& Stain 3
Incisal: Stain i2
B1 A1
Stain 2
B2 B2 A wash of Stain 2
B3 B2 1 firing of Stain 2
B4 B2 2 firings of Stain 2
C1 B2 A wash of Stain 3
C2 B2 Stain 3
B2
1st firing: 2/3rd Stain 3
F11
C3 B2 & 1/3rd Stain 2 mixed
together and wash over
the entire crown, including
incisal area
2nd firing:
Body: 50/50 mix from 1st
fire & glaze
Incisal: 50/50 mix of i1 &
glaze
1st firing: 50% Stain 3 &
C4 A3.5 50% i1 mixed together
and wash over the entire
crown, including incisal
area
2nd firing:
Body: 50/50 mix from 1st
fire & glaze
Incisal: 50/50 mix of i1 &
glaze
D2 A1 Stain 4
D3 A2 Stain 4
D4 B2 1st firing: 2/3rd Stain 3 &
1/3rd Stain 2
2nd firing: Olive
Use of glazes and stains by third-party
manufacturers
Only the native range of glaze and stains (Dentsply
Sirona Universal Stain and Glaze) in conjunction with
the appropriate liquid is recommended for customizing
and glazing Celtra Duo. Glazes and stains by third-party
manufacturers may require other firing temperature and
cycles than those recommended for Celtra Duo.
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Firing—Dentsply Sirona Universal Stains and
Overglaze Only
General: Firing objects must be placed on a carrier
Incisal
within the furnace. Placing the objects on plain firing
Stain
pad with firing tray or on firing pad with a platinum foil
is recommended.
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Alternatively, scale-free rounded metal pins (e.g.
i1
platinum wire) or firing pins may be used, or firing
cotton for direct support or in combination with thin
metal or ceramic pins. Make sure that the pins do not
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touch the restoration. If you prefer using an auxiliary
firing paste, Harvest Dental SuperPeg Putty II™
refractory paste is recommended (available separately,
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see manufacturer's complete Directions for Use),
applied loosely to the inside of the crown and never
beyond the crown margin. Thick ceramic pins or third
party auxiliary firing pastes may result in cracks and are
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therefore not recommended for use in connection with
Celtra Duo restorations.
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When using firing pins, make sure that no sharp pin ends
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touch the restoration. Firing paste should always be
applied in small quantities and should not completely fill
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the inside of the restoration.
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• Always use a firing pad for posterior units and/or
i2 looped Dentsply Sirona All-Ceramic firing pins with
a small amount of Super Peg Putty, placed onto a
honeycomb sagger tray. Do not use other types of
firing pins.
50/50
mix of
Firing paste
i1 &
• If a firing paste is preferred, then only
glaze
SuperPeg II is recommended.
™
• Other firing pastes may lead to restoration
CAUTION
cracking.
General firing recommendations
• Follow glaze/stains firing programs listed in Table 4.
50/50
• The optional glaze firing will increase the flexural
mix of
strength of Celtra Duo to 370 MPa. To increase
i1 &
the flexural strength it is only necessary to fire the
glaze
restoration up to 820°C. The application of glaze is
an option but not necessary. In case of firing without
glaze skip the Pre-drying and drying steps of the
firing program. Make sure to polish the restoration
first before firing.
• Starting temperature 500°C
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• Place the object on the firing tray/firing table of the
furnace.
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Table 4. Glazing/Stains Firing
1st 2nd &
glaze/stain subsequent
firing glaze/stain
firing
Pre-drying 2:00 min or 2:00 min or
4:00 min 4:00 min
when when
SuperPeg II™ SuperPeg II™
used used
Drying 1 2:00 min 2:00 min
Preheating 2:00 min 2:00 min
Start Temp 500°C 500°C
Heating rate 55°C/min 55°C/min
Final Temp 820°C 770°C
Vacuum off off
Hold time 1:30 min 1:30 min
Cooling 3:00 min 3:00 min
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Drying time depends on the type of furnace
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This cooling period of three minutes is only required
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for objects placed on firing pins or when using an
auxiliary firing paste. If the object is placed directly on
firing cotton with a firing support, no cooling phase is
required.
• Additional glaze firings may be performed at 770°C
in order to accentuate the shade or to correct it with
glaze, or increase the gloss. It is necessary to coat the
entire surface with Dentsply Sirona universal glaze.
• Finally, check the shade against a shade tab and
adjust if necessary.
• Note: After the first firing, the restoration may not
appear sufficiently glazed. In this case, apply a thin
layer of Dentsply Sirona glaze to the entire surface
with a brush. After applying the glaze, perform a
second stain/glaze firing as defined in the firing
recommendations. Additional stain/glaze firing cycles
can be performed using the same parameters.
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