Orthotown June 2018 - 32

Fig. 8

Fig. 9

gabled with β > α and horizontally activated about 4-5mm
per side. A reverse curve was incorporated in the lower arch
wire to maintain bite-opening during space closure.
At the end of upper arch space closure (six months later),
the protrusion had been reduced significantly. At this stage,
the upper arch was ready for second-order root correction of
the canine and premolars, and the third-order root correction
of the incisors.
Root correction requires large M:F ratios and good vertical
and AP control to minimize side effects and undesirable
equilibrium forces.5 A 19x25 TMA arch wire (with a helix to
lower the load deflection rate, and symmetric V-bends) was
engaged into the slots (Fig. 8). Root correction was completed
in 19x25 SS, followed by sliding mechanics and Class II elastics
for final space closure and to idealize the overjet (Fig. 9).
First molar bands were removed and power chain placed
7-7 (toed-in arch wires) to close up band spaces. Occlusal
detailing was completed in a 19x25 SS braided upper arch wires
with seating elastics to a 19x25 SS lower arch wire (Fig. 10).
The final records (Fig. 11) showed harmonious and
well-balanced facial aesthetics. The upper incisors were
intruded and retracted about 4-5mm by a combination of
translation and controlled tipping, and the curve of Spee on
the lower arch was leveled by incisor intrusion (Figs. 12 and
13). The total treatment time was approximately 26 months.
Retention included a maxillary wrap around the 7s and a fixed
lower 3-3 bonded only to the 3s.

32

JUNE 2018 // orthotown.com

Fig. 10

Fig. 11

Fig. 12

Fig. 13


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Table of Contents for the Digital Edition of Orthotown June 2018

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