Dentaltown June 2019 - 64

Fig. 1

SIMPLE CASE:

3-unit
implant bridge

cylinders that screw into the implants and act
as positioning "flags" in the intraoral scan.
These allow for the exact 3D position of
the implants to be transferred to the virtual
world. These digital impression copings are
called scan bodies and are specific for each
implant type and connection size of the
implant utilized (Fig. 1).

A 57-year-old healthy patient selfreferred to the practice because she was
having issues with her existing fixed dental
prosthesis (18/X/X/21/22) due to recurrent
caries under abutment tooth #21, which
had already been endodontically treated.
The long-term prognosis of abutment
tooth #21 was deemed to be poor, whereas
the other abutment teeth appeared to
have a fair prognosis (Figs. 2-4).

CAD/CAM-milled
final restorations
Today, the abutment design, material
choice (such as zirconia or lithium disilicate)
and technical design (monolithic or layered)
of the restoration can also be planned digitally
before surgery. Soft tissues have been shown
to react more favorably with the presence of a
highly polished zirconia or titanium surface,
so it's recommended that the area of an
implant restoration that will be subgingival
be composed of highly polished zirconia or
titanium. Also, subgingival extension of
ceramic restorative materials may not be as
favorable. The use of CAD/CAM technology
allows for the milling of final restorations
in a more precise and repeatable fashion.14
Generally, implant restorations should be
designed to reduce prosthetic complications
such as chipping. With new innovations
in restorative design, materials such as
monolithic zirconia have become a reality
and offer a very biocompatible option. A
full-contour zirconia crown allows for the
aesthetics of a tooth-colored material to be
utilized with minimal porcelain layering
on the buccal aspect for aesthetics. The
following cases will demonstrate this. ■

Fig. 2

Fig. 3

Fig. 4

64

JUNE 2019 // dentaltown.com


http://www.dentaltown.com

Dentaltown June 2019

Table of Contents for the Digital Edition of Dentaltown June 2019

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