Welcome to the University of Michigan Dentistry Podcast Series promoting oral health care
worldwide.
[Indistinct talking]
When you hold a diamond like this and bury it right to the shank. You will see that the
cut is pretty well self limiting and we will take this diamond into the interproximal as
far as we can go without nicking the adjacent teeth. Then we'll make a cut half-way through
the tooth in this area.
Again taking it interproxmially.
And then one near the incisal.
Now we'll make our vertical cut.
Then we will come to the incisal edge the full depth of the diameter of the diamond.
And then we'll make another vertical cut.
Then bury this again the full depth of our diamond.
Now you can also take this round bur and use it to open up the embrasure slightly and we
will do this with the same diamond. Open up the embrasure on each side of the tooth.
Now we will start now by reducing the incisal portion.
By cutting the little [...] away, bringing this into the interproximal. Now you'll notice
here if we can get a profile shot of this that is will be done in two planes. This is
the incisal cut and then the cervical cut will be in this plane because that labial
surface of the tooth is curved so it'll be this type of cut and then this type of cut
and that will maintain that curved surface. Okay.
[Drilling continues]
Now with this diamond without touching the adjacent tooth you can fling this reduction
into the interproximal area without scarring the adjacent tooth and this then will allow
an adequate thickness of porcelain into the interproximal. With the same diamond then
this incisal can be reduced and we'll take the incisal down to the depth of our [...] cut.
Now we'll make a finishing line at the lingual surface.
Then we're going to change to a chamfer in just a moment and this finishing line was
brought out into the interproximal so we have kind of a modified slice that will go into
our labial shoulder.
The drill bitů into the interproximal.
[Drilling]
We drag the Wedelstaedt in a backwards motion across this labial surface and you can see
we'll make then this slight bevel. Just breaking, just breaking the corner and making a slight
finishing line that's quite sharp that we'll show on the dye and the lab man will know
where to end the finishing line. I'll also do it in this area. Just break that at just
a slight 45 degree bevel and that bevel is brought into the interproximal to the slice
that we have measured.
We'll make this same finishing line with this file by holding the instrument along the axis
of the tooth and using an adjacent tooth as an anchor you can file this labial portion
of the tooth and again make a very smooth bevel here so that there is a very definite
sharp finishing line. There's no question when the laboratory looks at your dye where
the finishing line is.
You have been listening to a presentation from the University of Michigan's School of
Dentistry which is dedicated to supporting open learning and open educational resources.
This recording is licensed under the creative comments. It may be reused and redistributed
for nonprofit use. Please attribute materials to the University of Michigan's School of
Dentistry and redistribute under this same license. For more information on how this
and other University of Michigan School of Dentistry recordings may be used visit www.dent.umich.edu/license.