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This is a demonstration of the PTC perfect margin technique
This technique was developed using specific products and instruments
a number eight round bur
the PTC WC-1 Wax Carver
and the perfect margin dipping wax
trim the die with a number eight round bur.
This bur creates a two millimeter undercut below the margin
Second, after lubing the die, we'll dip it in the perfect margin dipping wax.
There are many dipping techniques, but we feel this one gives the best results.
Hold your hand vertically
with the die ninety degrees to your palm.
Position the die so that the highest part or sharpest part of the die
is facing your palm
Support your hand on the dip pot
and swipe the die in a curving motion so the wax flows around the die and through
the v shaped preparation.
Dip the die to just below the margin.
Now lower your hand and withdraw the die slowly.
Stop just before the tip of the die leaves the wax.
The wax will pull away from the tip of the die and leave only a a small dot of excess
Next, we're going to trim the die
just at or below the margin.
Hold the half hollenback at ninety degrees to the margin as you're cutting.
Trimming at a ninety degree angle is essential to get the intended result.
Cut all the way through the wax.
Do not pull the wax as it will stretch
and distort the margin.
You will now have a small ledge of wax
right at the margin.
Next, hold your electric waxer or wax spatula at approximately forty five
degrees to the axial wall of the die.
With the side of the wax tip touching the margin
flow the excess wax over the margin and into the undercut.
We're creating a thin film of wax over margin. This will lock the coping on the
die will stabilize the pattern when carving full contour crowns.
You could proceed to place a lingual band or
begin the rough wax up
for a full contour crown.
The key to the perfect margin technique is the next step.
We will be using the hoe end of the WC-1
and will be utilizing the edge of the carver
not the tip.
Hold the carver in a fist grip like this
with the shaft of the carver facing away from you.
this is necessary to place the cutting edge of the trip
in the proper position
you can see that the two millimeter tip of the carver
fits perfectly into the two millimeter undercut on the die.
press the tip of the carver firmly into the bottom of the undercut
tilt the carver
at approximately forty five degrees to the margin
and carve toward you while slowly rotating the die away from you.
you can see the current of the margin is very precise because of the stability of
in the undercut.
go around the die couple of times to ensure you trim off any over hanging wax.
dip a Q Tip in die lube or Debubblizer.
Place the Q Tip firmly in the undercut
and varnish around the margin a few times.
now remove the coping
and under a microscope or loops check for any small over extensions.
if there are any simply remove them with your fingertip
and recheck the margin on the die.
with just a small amount of practice using a simple technique
you'll be able to produce precise margins
you can purchase any of the materials we've used here at the blue dolphin
products web site
bdp dental dot com
This technique and more is covered
in our four-day hands-on waxing course
please visit the PTC website
for more of our training materials and course dates