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First off, let's
understand All-Ceramics, and the nomenclature, so we can clear any
confusion you may have. All-Ceramics is easily defined as anything
that is metal-free. The properties and strength for All-Ceramics
varies however, and currently under a lot of discussion. Research
is in high gear on the different strengths among All-Ceramic
restorations. For the last couple years, the Lava/YZ coping has
been the leader when it comes to strength, but now with monolithic (E.max
LT and HT) crowns, it appears to be changing. The confusion in
what is stronger lies between the substructure and the porcelain.
Think of it like this, you have the Lava substructure (white coping on
the left) and the actual porcelain. The area between the porcelain
and coping is considered the weakest point among all restorations.
This interface is what everyone in the All-Ceramic world is paying
attention too. It doesn't matter how strong the substructure
(coping) is if the porcelain or interface is really weak.
Now here comes the solution, an all-ceramic crown with
no interface and no porcelain. It's E.max LT (low
translucent) and HT (high translucent), and if you bond these in place
correctly, some research is showing that it may be stronger than many
PFM's because of it's monolithic nature. A proper prep, which can
be as simple as a small chamfer on any posterior is fine and something
we at Patriot Dental Laboratory wouldn't mind warranting at all.
Occlusal reduction is a must and 1.5mm occlusal clearance would have to
be achieved for proper strength. Now some Dentists have and
use Cerec, which is very similar, however, in the lab, we can do so much
more with these type of crowns. This area of Dentistry is always
changing, even from day to day, for more up to date and complete
information, please don't hesitate to talk to a representative from
Patriot Dental Laboratory. |
