Pacific Coast Society of Orthodontists Bulletin Summer 2020 - 57

Pearls of the Pacific

Special Section: Class II Correction

Tips for Using Forsus in Class II Correction

Dr. James Chen
PCSO Bulletin Contributor

Class II correctors such as ForsusTM springs
(Figure 1) have been used in our practice for
a little more than a decade now. The primary
purpose of a Forsus spring is to apply the correct
biomechanical forces toward correction of Class
II malocclusions. The final outcome is the same
with Forsus springs and elastics, but the way they
go about the correction is vastly different. Forsus
springs deliver pressure to the lower arch by
pushing it forward, unlike elastics, which pull the
lower arch forward.

Figure 1. Forsus springs device

Usually, the pushing force of the Forsus spring
can cause the appliance to spin in the patient's
mouth and cause painful sores at the corners
of their mouth, but some minor adjustments to
the push rod can greatly improve the patient's
comfort, limit emergencies, and can even produce
slightly more activation.
The key is in the push rod component. I routinely bend the loop portion of the push rod from
the out-of-the-box acute angle to a 90° angle
(Figure 2). This little difference provides more
surface area for the loop to contact the lower
brackets and reduces the rotation issues. In
addition, the 90° bend allows for slightly more
activation to the push rod without the addition of
shims. The bend is placed right after the stopper
on the push rod.
The second adjustment I make is to bend the
loop portion slightly toward the dentition, almost
like a toe-in bend at the loop (Figure 3). I find this
slight toe-in bend useful for stabilizing the Forsus
from rotating in the mouth as well.

Figure 2. Bending the loop portion of the push
rod to 90°

I want to thank Dr. Marc Deberardinis for teaching me this very useful pearl in residency!

Figure 3. Slight toe-in bend in the loop portion

Summer 2020    PCSO Bulletin	

57



Pacific Coast Society of Orthodontists Bulletin Summer 2020

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