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Figure 20: On posterior teeth, this depth cutter is also used to<br />
establish reduction, which is typically 2 mm for bilayered restorations<br />
such as PFMs or Lava crowns (3M ESPE; St. Paul, Minn.).<br />
For lithium disilicate crowns, I prefer 1.5 mm of occlusal reduction.<br />
I prefer 1 mm for BruxZir crowns, but this material can be prepped<br />
as thin as 0.6 mm. On this cuspid, we are reducing the incisal edge<br />
1.5 mm, like we did for the other anterior teeth.<br />
Figure 21: I am now placing a 1 mm depth cut on the facial surface<br />
of the teeth to be prepped. I prefer to do this at the height<br />
of contour, or incisal to the height of contour, to ensure that I reduce<br />
enough in that area. One of the most frequent mistakes I used<br />
to make was under-reducing in this area, which leads to bulky,<br />
opaque, ugly crowns.<br />
Figure 22: This image shows the payoff of spending a little extra<br />
time up front to make these depth cuts. Now we can grab our 856-<br />
025 bur again and go to town, secure in the knowledge that we<br />
know exactly where we are going. These depth cuts are a road map<br />
that keeps us from under-prepping or over-prepping these teeth,<br />
allowing us to fly through this part of the prep sequence.<br />
Figure 23: Typically, I start this part of the prep sequence by reducing<br />
the incisal edges. I intentionally use the middle third of the bur<br />
to do this reduction because I want to save the tip of the bur for<br />
finishing the gingival margin. There is little chance that the tip will<br />
be dulled by then, but I’m prepping multiple teeth and I want it as<br />
new and as sharp as possible.<br />
Another Use for Anterior BruxZir Solid Zirconia Restorations29