2. Historical background
– Developed according to the biomechanical
principles as described by Burstone in 1977 and
refined by Ricketts for Bioprogressive therapy
– It was first developed for leveling deep curve of
spee in the mandibular arch but now it has many
other modifications and uses
3. Material And Dimension of
Wire
– Wire 0.016 x 0.016 or 0.016 x 0.022 in an 0.022
slot is the material of choice. It can even be
made with 0.014 or 0.018 round wires.
– They are available in three different metals:
stainless steel, Nitanium Super Elastic, and Bio-
Kinetix Thermal NiTi.
4. DESIGN
All utility arches have a common design
A. The molar segment
B. The posterior vertical
segment
C. The vestibular segment.
D .The anterior vertical
segment
E. Incisal segment.
N.B 90 degree angles made by 142 plier
Loops formed by loop forming plier
7. INTRUSION UTILTY ARCH
5 mm
The posterior vertical step 3-
5 mm anterior to auxiliary
tube on upper first molar,
allowing slight retrusive
activation by pulling the
wire posteriorly and twisting
the end of the arch gingivally
INTRUSIVE FORCE IS 25gms
to each incisors.
8. The effect of intrusive
force on mandibular
teeth
Incisor intrusion
Molar posterior tipping
9. Any utility arch can be activated for
intrusion by making an occlusal
directed gable small bend in the
buccal segment
11. Uses of Retraction utility arch
a. Retraction and intrusion of upper
incisors in case of flaring
b. Closure of interproximal spaces
c. Correcting midline discrepancies
12. Activation of retrusive force by weingart
plier
grasp the wire posterior to the band tube
Pull it 2-3 mm
Bend 90 degrees gingivally