iDentistry The Journal September-December 2017 | Page 9

The Journal
This was followed by mandibular advancement
using Forsus FRD. 29 mm length of push rods
were selected. (Fig. 5) Upper 0.017 X 0.025 SS
arch wire was given anterior lingual root torque
and lower 0.017 X 0.025 arch wire was given
anterior labial root torque in order to prevent
undertorquing of upper anteriors and flaring of
lower anteriors due to Forsus. Molar correction
was achieved after 6 months of wearing the
appliance.
The patient was observed for 2-3 months with
appliance in place ,without any active forces to
check stability of correction and any occurence
of dual bite. This was followed by 3 months of
detailing and finishing of occlusion combined
with class II elastics ,which were gradually
tapered off. The total active treatment time was
18 months. (Fig 6,7)
Retention
A maxillary removable Begg’s wrap around
retainer with anterior inclined plane to hold the
corrected jaw relation was used for 6 months.
Permanent bonded cuspid to cuspid lingual
retainer was given in mandibular arch.
Discussion
The Forsus FRD can be used instead of Class II
elastics in mild cases and instead of Herbst
appliances in severe cases. Forsus springs
work best in patients with convex profiles, but
they are indicated in any Class II patients
except those with normal mandibles and
protrusive maxillae, or with protrusive or overly
large mandibles relative to the other cranial
structures.
Fig 4 : Pre-functional intraoral photographs
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Vol. 13 No. 3
Sep-Dec 2017