Dentsply Sirona Celtra Duo Instrucciones De Uso página 2

3.1.3 Veneers
• The standard reduction is 0.6 mm for the labial surface and 0.4 mm
in the gingival area (since the enamel is thinner in this region).
Reduce the labiolingual incisal angle by 1.0 to 1.5 mm. The prepa-
ration margins should be located in enamel. A chamfer or
rounded- shoulder preparation is recommended for all veneer
margins. Proximal extensions must be located far enough proxi-
mally to conceal preparation margins from site and to avoid
proximal gingival undercuts.
• Celtra Duo veneers are delivered by fully adhesive cementing.
See complete Directions for Use of the adhesive and cement
products. Self-adhesive cementing is not recommended for
veneer restorations.
3.2 CAD/CAM processing
Celtra Duo 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 Dental
Systems GmbH.
3.2.1 Software requirements
• Celtra Duo is supported by CEREC version 4.2 and above.
When using previous software versions, use of the IPS e.max®
system standard grinding program is recommended (do not
use the e.max® system speed program).
• In this case, the minimum wall thickness will have to be adapted
to the Celtra Duo recommendation; see Preparation.
3.2.2 Grinder and block sizes
• In the CEREC software, select the Celtra Duo material. The
Dentsply Sirona Celtra CAD/CAM grinding unit (milling unit) will
prompt you to insert a Celtra Duo Block. For detailed process-
ing steps, please consult the Instructions for Use and technical
manuals of the appropriate CAD/CAM systems. Make sure to
follow the manu facturers' recommendations.
3.3 Finishing the restoration
Celtra Duo provides two processing pathways where the material
can be milled and polished or milled, glazed and fired for addi-
tional strength. Alternatively, the restoration can also be polished
and fired for added strength. For polishing instructions go to
section 3/3/1, and stain and glaze instructions go to section 3.3.3.
3.3.1 Polishing without the optional staining and/or glaze firing
• Clean the restoration in an ultrasonic water bath, or with a
steam cleaner or clean the restoration using soap and water.
Carefully blow-dry the restoration in an air stream.
• Try in the final restoration to examine its fit. If necessary, adjust
the proximal and occlusal contacts.
• When making adjustments to the ceramic material, make sure
to avoid overheating.
• Sprue removal should be made using a suitable grinding instru-
ment, between 8,000-12,000 rpm's and using light pressure
with a laboratory motor and hand piece. After sprue removal,
use a coarse rubber wheel to remove any bur marks using a lab
motor at a speed of between 8,000-12,000 rpm's with light to
medium pressure.
• Diamond polishing bodies (< 60 µm) are recommended for
polishing the occlusal surfaces using a lab motor at a speed
between 8,000 – 12,000 rpm's with light to medium pressure. Do
Not Overheat. Follow the steps below for complete polishing:
• In clinical situations where maximum strength is needed, we
recommend firing the restoration
• The following steps must be followed in order to achieve the
healing effect and increase in strength to 210MPa (three point
bending test method) for the Mill and Polish option
• Use a coarse grit to prepare the surface for polishing and to
create a more uniform surface
• Followed by a medium and then a fine wheel (8,000-12,000 rpm)
using light to medium pressure
• An optional final step is to go over the entire restoration
with fine diamond paste using a soft-medium Robinson
brush (4,000-8,000 rpm) with light pressure
• Celtra Duo quickly becomes shiny, there is a risk to under polish
the material and not achieve the strength of 210 MPa. It is not the
shiny surface that gives the material its strength, it is the effect
of the smoothing and polishing that strengthens the material.
3.3.2 Staining, Glazing and Applying Corrections to milled
Celtra Duo restorations
• If milled restorations require no corrections, proceed to step
3.3.3 for optional staining and glazing instructions.
• If milled restorations require corrections, proceed to step 3.3.4
for Application of Celtra Correction Porcelain instructions.
3.3.3 Instructions for optional staining and glaze-firing of Celtra
Duo CAD/CAM restorations
• Custom staining of Celtra Duo restorations can be performed
using Celtra Universal Stains and Glaze or Dentsply Sirona Uni-
versal Stains and Glaze instructions below.
• For best results, any sanding marks on the surface should be
removed with a suitable coarse rubber wheel
• 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 ultrason-
ic cleaner with distilled water. If a steam cleaner or ultrasonic
cleaner isn't available clean thoroughly with soap and water.
Any contamination after cleaning must be prevented.
• Mix the mass thoroughly with a spatula. Do not use a metal
spatula. Withdraw desired amount of Celtra stain or glaze and
place it on the mixing palette. For a thinner consistency dilute
the material with Dentsply Sirona Stain and Glaze Liquid.
• Use Dentsply Sirona stain and glaze liquid to clean the brush,
do not use water to clean the brush as water can create an
"orange peel" appearance.
• Apply a sufficient amount 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.
• 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 characterized with
stains.
• The basic shade is determined based on the Vita shade groups
(A, B, C, D) (see Table 1). Please use the Vita classical shade
guide.
Table 1: Assignment of Shade Groups
Vita Shade Bleach
Group
Universal Stain Stain 0
Shade
Table 2: Use of Incisal Stains
Stain Tooth Shade
Incisal Stain i1 A1, A2, A3, B1, B2, B3, B4, D2, D3, Bleach
Incisal Stain i2 A3.5, A4, C1, C2, C3, C4, D4
Use of glazes and stains by third-party manufacturers
Only the native range of glaze and stains (Dentsply Sirona Uni-
versal Stain & Glaze) in conjunction with the appropriate liquid is
recommended for customizing and glazing Celtra Duo, as its
compatibility with Celtra Duo has been tested and is guaranteed.
Glazes and stains by third-party manufacturers may require oth-
er firing temperature and cycles than those recommended for
Celtra Duo.
3.3.4 Instructions for Application of Celtra Correction Porcelain
to Celtra Duo CAD/CAM restorations
• Mix correction porcelain with distilled water or Dentsply Sirona
Modeling Liquid U to desired consistency (thick consistency).
Apply porcelain where applicable. Fire to complete the restoration
following the procedures and firing programs listed below:
• First Glaze and Correction Porcelain: Apply Dentsply Sirona
Universal Glaze over the entire Celtra crown then apply CEL-
TRA Correction porcelain to the required areas and fire at 820 °C
according to the first correction firing program in Table 3. Polish
to a high gloss, if needed.
• Second Glaze: If after first firing the required glaze appearance
is not achieved, re-apply glaze, and fire according to 2nd and
subsequent glaze firing program in Table 3.
3.4 Firing the restoration
3.4.1 Firing Universal Stains and Glaze Only
• Place the restoration on a firing pad and then on a honeycomb
tray. Always use a firing pad for all restorations, placed onto a
honeycomb sagger tray.
• If firing an anterior, place the restoration with the lingual facing
down and with premolars, place the restoration with the inter-
proximal facing down. If there are any imperfections left of the
glaze from the firing pad, it can be easily corrected by polishing
that area.
3.4.2 General firing recommendations
• The optional firing will increase the flexural strength of Celtra
Duo to 370 MPa (three point bending test method). To increase
the flexural strength it is only necessary to fire the restoration
up to 820 °C. The application of glaze is an option but not nec-
essary. In case of firing without glaze skip the Pre-drying and
drying steps of the firing program. Make sure to completely
polish the restoration first before firing.
• Starting temperature 500 °C
• Place the object on a firing pad then on honeycomb tray, then
place on the firing tray/firing table of the furnace.
• 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 (available separately, see complete Di-
rections for Use) to obtain a uniform glossy finish.
• Check the shade against a shade tab and adjust if necessary.
A B C
Stain 1 Stain 2 Stain 3
D
Stain 4
2