Porcelain application methods /orthodontic courses by Indian dental academy

POCELAIN APPLICATION
METHODS.
INDIAN DENTAL ACADEMY
Leader in continuing Dental Education
www.indiandentalacademy.com

OPAQUE PORCELIAN
APPLICATION.

GLASS ROD TECHNIQUE
• First, lightly wet the
oxidized metal metal substructure to
be veneered with distilled water and gently
vibrate the casting for thorough wetting.

• Use point end of glass
rod to apply the
opaque
porcelain.begin the
opaquing most convex
portion of the metal.

• Move the opaque
towards the porcelain
metal junction from
one inter proximal
area to to other &
cover the incisal area.

• Lightly tap the
hemostat with metal
instrument to
condense the opaque
porcelain and excess
opaquing liquid will
raise to the surface.

• Place the edge of
tissue,against the an
edge of the moist
opaque porcelain.hold
the tissue in place until
the liquid is absorbed
and takes on a dull
appearance.

• Blend the opaque at
the porcelain metal
junction to establish a
gradual transition from
opaque to external
surface.

BRUSH TECHNIQUE
• Opaque can also be
applied with the
brush.load the brush
tip with opaque
porcelain and carry it
to the coping.

• Application of the
opaque twice is also
recommended.initially
thin layer of the
opaque and complete
masking is followed.

DENTIN APPLICATION
METHOD.

• Carefully return the
cleaned,opaqued
coping to the master
cast.place folded tissue
or bottling paper on
the lingual side of the
restoration.

• To minimize the
potential for entrapping
air in the porcelain,
move the tip of the
pointed brush through
the mixed dentin
porcelain.remove the
brush with dentin
porcelain captured on
the brush tip.

• Apply the porcelain to
the most convex area
on the restoration.

• Gently push the
porcelain to the
intrproximal,incisal
areas.

• Move the porcelain
down to the incisal
edge and lightly blot
the build up to
condense the porcelain
on the substructure.

• To create the mesial-
facial line angle,wipe
the brush to dry it
slightly and reduce the
pointing then lightly
move from the mesial
gingival area to
mesial-incisal area.

• Point the brush and
add additional dentin
porcelain to lingual
aspect of the incisal
edge.smooth and
condense the incisal
edge from the lingual
and facial aspects.

• Use a razor knife to
cut back the incisal
edge from between
1.0to1.5mm

• Remove dentin
porcelain at the mesial
inter proximal line
angle.extend the cut to
the junction of the
middle and gingival
1/3rd
for younger
patients.

• At the distal
intrproximal line
angle,make a cut form
the incisal edge
towards the gingival
1/3rd
as far as required
for the esthetics.

• Examine the
restoration from an
incisal view for
symmetry and
adequacy of the cut
back.

ENAMEL APPLIACTION
METHODS.

• With pointed
brush,apply enamel
porcelain to one
corner of cutback.

• Add more enamel
porcelain and move it
across the facial
surface in the incisal
one third.

• Blend the enamel
porcelain at the
junction of middle and
gingival 1/3rd
&begin
to establish the incisal
edge & condense the
porcelain by blotting
periodically.

• Blend the enamel
porcelain into gingival
1/3rd
on the facial
surface.Recreate the
interproximal contours
and line angles.

• Shape the mesial-
incisal corner as
required for each
case.examine the
build up form incisal
view&evaluate the
overall shape .

ALTERNATIVE BUILD UP
TECHNIQUE.

• Apply the opaque to
mask the underlying
metal.

• Complete & smooth
the dentin buildup.

• Create three
developmental lobes
with the pointed brush.

• Invert the cast & place
translucent porcelain
in the two
developmental
groove.apply enamel
porcelain to the inter
proximal areas.

• Continue this process
until the entire crown
is built to full contour.

• Finally, use the
whipping brush to
gently smooth the
entire porcelain build
up.

• Once the porcelain has
been fired,you should
be able to observe
demonstrable
mamelons in the
restoration.

PORCELAIN APLICATION
FOR
FIXED PARTIAL DENTURE.

• Apply and condense
opaque
porcelain.Cover any
gray areas,and fire the
prosthesis.

• Return the opaqued
FPD to the master cast
with a piece of tissue
paper cut to cover the
entire pontic area.

• Add a small portion of
dentin porcelain to the
under side of the
pontic on the FPD
frame work.

• Return the frame work to
the master cast and gently
rock it back and forth
until it seats
completely.Remove the
frame work and inspect
the tissue side of the
pontic.this area should
cover completely with
porcelain and well
condensed.

• Place the frame work
back on the master
cast and apply dentin
porcelain or add and
condense opacous
dentin to the cervical
areas of the three
components.

• Complete the dentin
build up.

• Create the
developmental
lobes.Use thin razor
knife to cut through
inter proximal areas
and individualize the
teeth.

• Add enamel veneering
material.

• Condense the
porcelain build up.

• Measure the mesial-
distal width of each
tooth with a Boley
gauge.compare that
measurement with
porcelain build up.

• Use a knife or other
instrument to make
any necessary
adjustments in the
mesial-distal width.

• Facial view of the
build up.

• Lingual view of the
build up.

• Three unit FPD after
firing.

FIRING PROCEDURES.
• The large bulk of the build up will require more
time to dry and pre heat than the opaque
porcelain.
• Put the restoration on saggar tray place it on the
muffle stand of the furnace.
• Properly matured porcelain have a slightly
orange peel appearance when fired correctly.
• Do not under fire the porcelain.porcelain that has
not matured properly has no shine to the surface
& internally has cloudy appearance.

• Restorations that are under fired porcelain often
have to be stripped form metal and rebuilt.
• Over fired porcelains appears to be glazed and
the surface has little or none of the pebbly
appearance.
• The firing temperature is usually lowered 10
degrees with each correction firing, so that initial
build up dos not get effected.

Porcelain application methods /orthodontic courses by Indian dental academy

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