This program demonstrates how to properly
place three pulp protection materials,
calcium hydroxide cavity varnish
and zinc phosphate cement.
The Museo ACLU cell preparation is on the
lower right.
First molar we are using the rubber
dam to facilitate visibility.
After viewing this program and practicing the
procedures with your own materials.
You should be able to properly demonstrate the
pulp protection techniques.
According to the following criteria for
evaluation,
one proper mixing of protection
materials according to the manufacturer's
directions
to proper location of protection
materials within the cavity preparation.
This includes proper sequencing of
materials and avoiding the cave oh
surface margins to prevent restorative
breakdowns
and three restoration of the cavity
preparation to ideal form.
This includes proper contour and provision of
sufficient depth for the restorative material.
The following materials are suggested for this
procedure.
Mirror explorer calcium
hydroxide such as hydraulics,
mixing pad and applicator cavity
varnish,
such as copa light cotton balls and
gauze cotton pliers,
cement and liquid base such as flex
zinc phosphate glass
slab,
mixing metal spatula
plastic instrument and small and
large pluggers.
Use of the three protective materials,
calcium hydroxide cavity varnish and
zinc frost fate depends upon the depth and
extent of the preparation.
Look at this preparation carefully note that
the floor is not level.
The preparation extends deeper towards the
pulp on the Aclu's and proximal
box areas.
Calcium hydroxide such as hydraulics
is used to protect the pulp from acids.
Primarily,
it is used to stimulate secondary Denton
formation which ultimately prevents
sensitivity.
Contra indications calcium
hydroxide should not be used for thermal
insulation and base preparation build
up
for this preparation combined.
Equally small portions of the two tubes of
hydraulics mixing quickly with the
applicator to a creamy uniform
consistency work rapidly as the
protective agent sets quickly then wipe
the applicator clean
using the tip dab a small amount of
the hydrates mixture on the deepest portion of the
cavity being careful not to get
any on the cable surface margins,
apply the hydrates until the deepest area
is covered.
The remainder of the area will be filled with base
to ideal form.
If any hydrates should contact the cable surface
margins,
remove it with an explorer.
When poeple exposures occur.
Calcium hydroxide is used to stimulate
production of reparative Denton.
However,
it is generally used with a cement base
because calcium hydroxide is not a
thermal insulator.
Calcium hydroxide may occasionally be
used alone for leveling slight depressions
or undercut areas in an otherwise
ideal preparation.
When it is not intended for thermal
insulation or possible exposures.
After the calcium hydroxide is set,
apply the cavity liner or varnish.
We are using co polite.
This application of cavity varnish seals
off the dental tubules which helps prevent
thermal sensitivity.
Cavity varnish is contraindicated for
placement directly on possible exposures
to apply,
dip a small wad of cotton into the copa light
jar and wipe it on the preparation.
Avoiding the cable surface margins,
then blow dry and remove any marginal
excess with an explorer or damp
cotton swab.
Cavity liner may accompany based cement
or be used alone for any
preparation.
That is an ideal form.
The zinc phosphate cement base may be
placed next to provide further protection.
Zinc phosphate is used to
one provide thermal insulation to
prevent sensitivity to the tooth and
to to restore the preparation to ideal
form.
It may be used alone or in combination with
cavity varnish depending upon the depth of the
preparation.
It may also be used without calcium
hydroxide if the preparation is
void of deep purple extensions.
Counter indications include preparations where
there is insufficient death to place the permanent
restored of material and possible
exposures.
Placing the acidic zinc phosphate close to the pulp
wood cause patient discomfort and possibly the
death of the Popol tissues.
Visually conceptualize the amount of powder
and liquid to be needed depending upon the
extent of the preparation.
Use a cool dry glass lab
to prevent the mixture from setting up too quickly.
When combining the two ingredients,
always add small increments of
powder to the liquid.
Mixing each edition slowly and
over a wide area for
30-45 seconds.
This is important in order to reduce the
heat,
which would cause the mixture to prematurely set.
When the mixture reaches a doughy
consistency,
pick up small amounts with your fingers and
roll the material into small balls.
Larger balls would be used for larger preparations.
The base material should not stick to your fingers,
place the ball in the prescribed area,
then dip your plugger into the remaining powder
to keep the base from sticking to your instrument
and press the material into place.
If there is excess material left on your instrument,
wipe it off before dipping it into the powder.
Use a small or large plugger depending
upon access and interchange
instruments as needed.
If more material is necessary,
repeat the process until the desired height
is achieved contour,
the base to ideal preparation form
as if there had been sufficient tooth structure.
Remember to allow sufficient depth for the
restorative material to be able to adhere
and retain its strength.
Although we are demonstrating this procedure on a
type of tooth,
you would not extend the height of the base into the
enamel.
The dental enamel margin can easily be seen
on this real extracted tooth
note that the Denton is more yellow in color than the
lighter enamel.
Avoid filling in the retention points.
If this happens,
they must be replaced by the dentist.
Do not place the base against the cable surface
margins of the preparation or they may
cause the restoration to leak,
then smooth the surfaces of the base with your plugger
or chisel to permit easy placement of the
restoration
fill in any undercuts such as the buckle
flare.
Seen here,
the retention points would be replaced in cement by
the dentist
note.
The criteria for properly placed cement
based protection.
The base should be contoured.
So that one,
the poeple floor is restored to normal cavity
preparation depth
to the axle wall has adequate
depth for the restoration from the cave oh,
surface margin.
three,
the axle wall is parallel to the previously
existing proximal service
for the base height would not extend into the
enamel of a real tooth.
five,
the retention points remain unfilled
or are replaced.
six,
the margins are free from excess base material
And seven,
the base is smooth and ready to receive the
restorative material.
Note that the undercut in the enamel beneath the cusp
has been filled and smoothed to ideal preparation
form.
We have just demonstrated placing three pulp
protection materials,
calcium hydroxide cavity varnish
and zinc phosphate cement.
Please practice these procedures with your own
materials and ask your instructor for any
further assistance.