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Figure 26: It’s now time to connect all the
depth cuts with the workhorse bur in the
Reverse Preparation Set: the 856-025 bur. I love
prepping with this large bur because it cuts very
smoothly and does not have a tendency to dip
into the tooth, even if you have build-up material
on the tooth. As shown here, the reduction is
already finished in the gingival third, so we are
working on reducing the incisal and middle
thirds and blending these planes together.
Figure 27: This is also the time when we need to
blend our facial reduction with the interproximal
reduction that was started with the 55 bur.
Because tooth #9 has already been prepped, we
were able to use the round bur interproximally
on the mesial, which we usually cannot do. A
glance back at Figure 25 shows that round bur
cut on the mesial of tooth #8. Because tooth #9
is already prepped, we are also able to take the
856-025 bur onto the mesial surface. Typically,
we have to switch to the 856-016 bur (Axis
Dental) to do this, which is the same shape, but
has a smaller diameter.
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Figure 28: The reduction on the lingual surface
is accomplished with an Alpen 379-023 football
bur (Coltène/Whaledent Inc.; Cuyahoga Falls,
Ohio). I typically do not place a depth cut on
the lingual surface of anterior teeth because
I find it easy to check the reduction against
the lower anterior teeth simply by having the
patient close. Unlike on posterior teeth where
eyeballing occlusal reduction is very difficult
(especially on lingual cusps), I don’t have this
same problem on maxillary anterior teeth. Of
course, if you wanted to place a 1 mm depth cut
on the lingual, there would be nothing wrong
with that.
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