Pacific Coast Society of Orthodontists Bulletin Summer 2014 - (Page 17)
pcso program taLk
TADs
by dR. alySSa levin
Dr. Levin
I
t is a very exciting
time to be part of
the orthodontic
profession. Perhaps
for the first time since
modern advances in
adhesive technology
and the introduction of
nickel titanium wires in
the 1970s, we are seeing
a major paradigm shift
in orthodontic diagnosis
and treatment planning.
This column is a new
feature for the PCSO
Bulletin. It is fashioned
after John Graham's "The
Hot Seat" in the Journal
of Clinical Orthodontics.
Unlike "The Hot Seat,"
however, this column's
purpose will be to explore
how the 12 orthodontic
residency programs
within the PCSO
constituency are teaching
and integrating emerging
appliances and softwaredriven technologies. Some
trends are controversial
(CBCT imaging), and
some come with hefty
price tags (SureSmile,
iTero scanners); through
the dissemination of
information, it is my hope
that we can stimulate
some discussion and
learn something in the
process.
In honor of the upcoming
PCSO Annual Session
Joint Meeting with
the World Implant
Orthodontic Conference,
SUMMER
2014 * PCSO BULLETIN
this inaugural column
will focus on the use of
temporary anchorage
devices (TADs). Not 10
years ago it seemed like
TADs, at the time an
orthodontic adaptation
of overdenture miniabutments, were being
used in almost every
clinical situation
imaginable. By now the
dust has had time to
settle - or has it?
As you read through the
programs' responses
(N=11), you will note many
similarities and definite
trends. Most programs
cite absolute molar
intrusion for open bite
closure and en-masse
retraction/protraction
as top indications for
the use of TADs (n=10),
and many (n=7) identify
emerging orthopedic
protocols (such as that of
DeClerk1) as promising
applications. Anesthetic
protocols are typically,
but not always, topical
plus local infiltration
(n=7). All programs cite
the hard palate as the
most reliable placement
site, and factors related
to surgical technique as
the most common reasons
for TAD failures. Most
programs (n=9) use CBCT
imaging as part of a presurgical work-up, and
prefer immediate loading
whenever possible. There
was also no preference
(n=8) for indirect vs.
direct biomechanics.
In other areas, answers
were surprisingly more
varied. There was no one
proprietary TAD clearly
preferred, although
all TADs had similar
design characteristics
(interestingly reminiscent
of our bracket choices).
Estimated failure rates
varied between 10% to
40%, with the majority at
15% to 25%. There were
no special, recurring
themes to any post-op
instructions.* A universal
driver with improved
driver features was the
most frequently desired
design improvement
(n=5).
Skeletal anchorage in
orthodontics is not a
new concept. The first
published use of implants
as orthodontic anchors
occurred more than 70
years ago; Gainsforth and
Higley placed vitallium
screws in dog mandibles
to effect tooth movement.2
If you do a PubMed search
for "temporary anchorage
devices orthodontics
OR mini-implants
orthodontics," you will
find hundreds of case
reports and studies on
TAD design and success
rates. Noticeably lacking
are randomized controlled
trials and meta-analyses
on treatment outcomes
or long-term stability,
relative to conventionally
treated controls. I urge
any resident looking
for a research topic to
consider adding to our
body of evidence-based
literature in this area. As
a practicing clinician, you
too have the opportunity
to get involved by
participating in your
regional dental practicebased research network.
TADs have revolutionized
orthodontics and
expanded our abilities to
effect orthodontic tooth
movement. Although the
dust has not yet settled, it
is clear that TADs are here
to stay.
* Answers to this question
were not included in the
table.
References
1. De Clerck HJ, Cornelis MA,
Cevidanes LH, Heymann
GC, Tulloch CJ. Orthopedic
traction of the maxilla
with miniplates: a new
perspective for treatment
of midface deficiency.
J Oral Maxillofac Surg
2009;67:2123-2129.
2. Gainsforth BL, Higley LB.
A study of orthodontic
anchorage possibilities in
basal bone. Am J Orthod
Oral Surg 1945;31:406-417.
S
17
Table of Contents for the Digital Edition of Pacific Coast Society of Orthodontists Bulletin Summer 2014
The Big Easy: Not Always So Easy
About the PCSO Mission Statement
AAO Trustee Report
PCSO Business
AAO Council on Scientific Affairs (COSA) Report
Component Reports
PCSO at a Glance
AAOF Report
Decrease Stress and Increase Volume
Resident Spotlight: Loma Linda School of Dentistry Postgraduate Orthodontic Program
Younger Member Spotlight: Dr. Melissa Bailey
Third Molar Protocols
Editorial: Special Section
PCSO Program Talk: Orthodontic Residency Programs and the Use of TADs
Case Report: Pre-Treatment
Faculty Files: TADs in Orthodontics: A Review
Seasoned Practitioner's Corner: Dr. Terry McDonald Interviews Dr. Michael Chaffee on TADs
Case Report: Post-Treatment
Pearls of the Pacific: Instant Edentulous Anchorage
Portrait of a Professional: Dr. Earl S. Johnson
Sweet Farewell: Retainers and Retention
In Memory: Dr. Burton Littleton Fletcher
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