الفهرس 
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Abstract
Class II division 1 malocclusion has been described as the most
frequent treatment problem in orthodontic practice,
21% of Egyptian adults
suffer from Class II division 1.
Recently there are an increasing number of adults demanding
orthodontic therapy and there is great interest in techniques that minimize
the need for patient cooperation. Inter arch springs, Jasper Jumper, Eureka
Spring and Twin Force Bite Corrector have been developed in response to
this noncompliance phenomenon.
The aim of this study was to investigate the skeletal, dental, and soft tissue effects of Twin Force Bite Corrector Appliance during its
use in the treatment of Class II division 1 malocclusion in the permanent dentition subjects.
This study was performed on twenty Egyptian females having
Class II division 1 malocclusion with an overjet ranged from (5- 10 mm),
their ages between (15 -18) years old, at the end of pubertal growth stage,
and did not perform any previous orthodontic treatment.
All subjects were clinically examined, orthodontic diagnostic study casts were recorded, extraoral and intraoral photographs were taken.
Panoramic and lateral cephalometric radiographs in natural head position
were obtained, before treatment (Tl), before installation of Twin Force Bite Corrector (TFBC) Appliance (T2), and after finishing treatment (T3).
The subjects were treated with fixed, preangulated and pretorqued,
edgewise appliance to level and align the dental arches. First molars were
banded and a transpalatal arch was placed between the maxillary first
molars to control the tendency for transverse expansion. The remainder of the dentition bonded with 0.022” edgewise brackets. Twin Force Bite
Corrector (TFBC) appliance was placed after 0.019 x 0.025” maxillary and
0.021 x 0.025” mandibular stainless steel archwires were engaged. Size
determination of Twin Force Bite Corrector was made according to the
manufacturer’s instructions.
Twin Force Bite Corrector was used until the anteriors were edge to edge, then removed and the subjects were instructed to wear inter maxillary elastics. In the current study all the subjects were corrected to Class I molar and canine relation with proper overjet and overbite.
The results revealed no significant changes in the maxillary and
mandibular sagittal or vertical skeletal measurements. Basically, Twin
Force treatment resulted in dentoalveolar changes in both arches observed
by retroclination of the upper incisors with slight extrusion and proclination
of the lower incisors with significant intrusion in addition to maxillary
molar distalization with intrusion and mandibular molar mesialization with
extrusion.
This is accompanied with significant improvement in the facial profile
associated with a retrusion of the upper lip but not a forward position of the
lower lip.