Treatment of class II div2 malocclusion
A Class II incisor relationship is defined by the British Standards
classification as being present when the lower incisor edges occlude
posterior to the cingulum plateau of the upper incisors. Class II division 2
includes those malocclusions where the upper central incisors are
retroclined. The overjet is usually minimal, but may be increased. The
prevalence of this malocclusion in a Caucasian population is
approximately 10 percent...
Etiological factors of class II div2
The majority of Class II division 2 malocclusions arise as a result of a
number of inter-related skeletal and soft tissue factors.
a. Skeletal factor.
(mostly cl II)
b. Soft tissue factor.
(unfavourable)
c. Dental factor.
? Class II division 2 malocclusion is commonly associated with a
mClass II skeletal pattern, but may also occur in association with a
Class I or even a Class III dental base relationship. The vertical
dimension is also important in the aetiology of Class II division 2
malocclusions, and typically
is reduced. There is a low gonial angle giving rather square facial
profile due to forward rotational pattern of the mandible which
will help in reducing the severity of the skeletal patterns but give a
deep bite.
? The influence of the soft tissues in Class II division 2 malocclusions
is usually mediated by the skeletal pattern. If the lower facial
height is reduced, the lower lip line will effectively be higher
relative to the crown of the upper incisors (more than the normal
one-third coverage). A high lower lip line will tend to retrocline
the upper incisors. There is commonly pronounced labio-mental
groove beneath the lower lip.
? As with other malocclusions, crowding is commonly seen in
conjunction with a Class II division 2 incisor relationship. In
addition, any pre-existing crowding is exacerbated because
retroclination of the upper central incisors. If there is crowding of
the upper dental arch, the upper laterals or canines may be
proclined in front of the lower lip function.
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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