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CERECDOCTORS.COM
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QUARTER 1
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2016
C A S E S T U D Y
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B Y M I K E S K R A M S TA D , D . D . S .
full-contour zirconia has emerged as one of the most popular restorative materials in the last few years.
The increased use of this material by dentists worldwide is a result of many restorative advantages: extremely high flexural
strength, allows more conservative preparation of teeth, allows a lower minimal thickness that other ceramic materials, great
performance in patients with parafunctional habits, ability to conventionally cement, and of course it’s tooth-colored.
Chairside Zirconia Is Here
Clinical Flexibility and Predictability for CEREC Dentists
In the past, the main disadvantage for dentists, specifically those
who do CAD/CAMsingle-visit restorations, is fabrication time. Full-
contour zirconia needs to be sintered, a process that traditionally
takes multiple hours to accomplish. This would force a dentist to
buy an additional furnace or send to a dental laboratory to fabricate
the restoration. Most importantly, it was not a single-visit procedure.
This has now changed.
At the 2016 Chicago Midwinter Meeting, Sirona introduced a
revolutionary new zirconia workflow that will allow dentists to
fabricate full-contour zirconia in a single visit. Most importantly,
the workflow only takes about an hour and a half! To accomplish
this, Sirona has introduced dry milling capabilities with their
CASE STUDY
fig. 1:
This patient presented to my office with a PFMand RCT tooth
that had a defective subgingival margin on the distal. We decided
that the restoration needed to be replaced.
fig. 2:
After removing decay and final preparation of the case, it was
determined that the best restorative option would be a cementable
zirconia crown. This was due to the fact that the preparation did not
have any enamel left and was very subgingival on the mesial, distal,
and lingual. The material that was chosen was Sirona inCoris
TZI C, shade A1.
fig. 3:
In Administration Phase of the software, the material
(TZI C) was chosen to be milled “Dry” in the new Sirona
Wet/Dry milling unit
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