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.