In this clinical tip from CDOCS, Dr. Darin O'Bryan takes you through a case in which Katana Zirconia from Kuraray Noritake helped him achieve the desired results for his patient.
Video transcript
"Hi, this is Dr. Darin O'Bryan with the CDOCS.com's tip of the day. In this tip, I want to talk about utilizing a Katana multilayer in the anterior.
"A case like this is a perfect example of when it's going to be useful. This PFM crown had a metal back due to a lack of clearance. The patient needed it replaced due to recurrent caries, but they didn't want to actually go through the process of intruding teeth to get enough clearance, and I wasn't real comfortable with adjusting the lowers.
"So once we got our proposal back, we looked at this, and we've got a nice proposal, as long as we're working with the Katana material, because we've got our clearance at about 0.8 mm, and we've got no shine through and no minimal thickness.
"If we switch this over to another material, however, though any of the glass, ceramics, or anything that is using the diamond burs, we all of a sudden start having minimal thickness issues. So, not only having a minimal thickness issue, at 0.8 mm, we still have the occlusal offset that we're going to have to worry about.
"So that thickness is going to get even less. This is a perfect time for utilizing Katana. Because if we look internally on these glass ceramics, we have these larger bur marks from the overmilling process due to the size of the burs. And this was done with the smaller bur, the 12 bur vs. the 12S.
"If we look at the milling parameters, or, sorry, the occlusal clearance parameters on the Katana, we only need 0.8 mm in the anterior on the lingual aspect. And since there is not the amount of overmilling with the Katana, and there's no milling offset, we can see that the internal aspect, or the entangle of this crown, is a much smaller diameter inside, because we're starting with a larger substrate. And so the burs can get in there, clean it out, and then as it shrinks, we don't end up having that overmilling process.
"The Katana Multi Block is great for taking a case like this and really getting a very nice result and not having to prep the opposing dentition or your existing tooth structure anymore due to the fact that we don't have the milling offset and we have much less overmilling with the zirconia restoration.
"I hope this helps. This has been your CDOCS tip of the day. For more information on these types of cases, visit us on our website at CDOCS.com or join us in one of our workshops."
