Dentaltown February 2021 - 51

patients-directly anchoring to
the canine with a button is a better
biomechanical approach, because a
hook provides a lingual force vector
in the anterior that counters the
plastic's ability to procline the teeth.
In general, buttons will reliably transmit
the desired force vector directly to the
attached teeth, whereas the force will be
dispersed over a variety of teeth with hooks.
Prefabricated cutout windows for buttons
are offered for Invisalign, Clarity, Spark
and SLX aligners. The Hole Punch plier in
Hu-Friedy's Clear Collection (Fig. 2) will
also create cutouts by hand.
Aesthetic bondable buttons are often
made of composite resin or ceramic materials.
Conventional clear buttons can be obtained
from most orthodontic suppliers, while mini
mold kits can be purchased for forming
buttons out of composite. G&H Orthodontics offers the Freddy, which is either a
flat circular button or bondable hook with
a curved base.
Clear Precision Aligner Buttons from
DynaFlex are made of a translucent
ceramic/composite hybrid. These buttons
have a maximized surface area to avoid
debonds and are contoured to be bonded at
the gingival margin of canines and premolars.
A recent re-treatment case utilizing Precision
Aligner Buttons and Clarity aligners is
illustrated in Figs. 3-5.
The potential downside of all bondable
auxiliaries is the risk of debonding, whether
because of elastic pull or the patient biting
hard foods, such as ice. Additionally, buttons
have the potential to cause rotation of
canines unless an attachment is placed to
compensate for the rotational moment of
the elastic force.
Doctors should select hooks or buttons
for their aligner cases on an individual basis,
weighing biomechanical considerations with
ease of use and comfort for the patient. ■

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

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Dentaltown February 2021

Table of Contents for the Digital Edition of Dentaltown February 2021

Dentaltown February 2021 - Intro
Dentaltown February 2021 - Cover1
Dentaltown February 2021 - Cover2
Dentaltown February 2021 - 1
Dentaltown February 2021 - 2
Dentaltown February 2021 - 3
Dentaltown February 2021 - 4
Dentaltown February 2021 - 5
Dentaltown February 2021 - 6
Dentaltown February 2021 - 7
Dentaltown February 2021 - 8
Dentaltown February 2021 - 9
Dentaltown February 2021 - 10
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Dentaltown February 2021 - 64
Dentaltown February 2021 - Cover3
Dentaltown February 2021 - Cover4
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