Dentaltown May 2019 - 90

Aesthetic
Ceramic Crowns:

Where Are
We in 2019?
by Rella Christensen, RDH, PhD
Rella Christensen,
RDH, PhD, leads
TRAC Research,
which is the human
studies section
of Clinicians
Report's nonprofi t
foundation.
Christensen's
studies involve
treatments within dental practices. She holds
a PhD in physiology and microbiology, with
postgraduate work in anaerobic microbiology.

Aesthetic ceramic crowns have dominated
dentistry since Glidewell Dental introduced
BruxZir in 2009. Since then, the TR AC
Research lab has studied numerous brands
of crowns from three material categories:
zirconia ceramic, glass ceramic and polymer
"ceramic" (Fig. 1). In the current study, there
are 23 products, 20 labs, more than 100 dentists
and 1,000 molar crowns (Fig. 2). The crowns
differ in many ways, but all are tooth-colored,

monolithic and CAD-CAM fabricated.
For more than 40 years, we've searched for
materials with the characteristics illustrated
in Fig. 3. Some formulations under study
now may meet these criteria. Key fi ndings
are reported here to provide direction for
clinicians who are trying to choose between a
multitude of diverse formulations. We report
on zirconia first, then briefly on glass ceramic
and polymer "ceramic."

Fig. 1: This laboratory in TRAC Research's Clinical Science area contains thousands of gold-sputtered
polyurethane replicas of test crowns and their opposing dentition under clinical study. The replicas provide
evidence of the exact condition of every test crown at each yearly recare appointment. Scanning electron
microscope images are made of the crowns using these high-resolution replicas.

90

MAY 2019 // dentaltown.com



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Dentaltown May 2019

Table of Contents for the Digital Edition of Dentaltown May 2019

Dentaltown May 2019 - Intro
Dentaltown May 2019 - Cover1
Dentaltown May 2019 - Cover2
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