Today, the
vast majority of posterior crowns fabricated in the United States by major
laboratories are composed of fully-milled zirconia. This staggering shift in
materials is trumped only by the fact that research shows there is a much
better method of finishing zirconia surfaces. Since early 2014, when we hosted
Rella Christensen RDH, PhD, to discuss wearability studies on monolithic
zirconia, there has been revealing evidence that highly-polished zirconia is
far superior to a glazed surface. Polished zirconia is so smooth that one is
challenged to even pick up a crown without gloves. And, unlike glaze, this
glassy, hygienic surface prevents plaque, rendering it much more biologically
friendly. 
Studies have
shown polished zirconia surfaces are also kinder to opposing dentition than
abrasive, glazed surfaces. And, once the glaze is worn, exposed rough zirconia
is even more unkind to opposing teeth. Polished crowns, according to TRAC
Research, retain their polished state as natural wear occurs. Polished also
exhibits improved translucency and esthetics, as the transmission of light is
unobscured.
Today, all ROE
monolithic TLZ crowns are polished. We are excited to be leading the way with
this improved modality. We know you will notice the difference on your next TLZ
case.
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