Anterior open bite
An anterior open bite is associated with a lack of vertical incisor overlap. It may be localized, affecting only a few teeth, or it may be caused by a divergence of the skeletal planes. Treatment is often required because the patient has trouble incising food due to the lack of an anterior occlusion. Speech may also be a concern, as an anterior open bite can be associated with lisping. Whilst treatment can improve both the occlusion and function, there is no warranty that speech will improve, as speech patterns are established early in life, long before establishment of the permanent dentition.
• Anterior open bite (AOB): there is no vertical overlap of the incisors when the buccal segment teeth are in occlusion.
• Posterior open bite (POB): when the teeth are in occlusion there is a space between the posterior teeth.
• Incomplete overbite: the lower incisors do not occlude with the opposing upper incisors or the palatal mucosa when the buccal segment teeth are in occlusion. The overbite may be decreased or increased.
Aetiology
Both inherited and environmental factors are implicated in the aetiology of anterior open bite. These factors include skeletal pattern, soft tissues, habits, and localized failure of development. In many cases the aetiology is multifactorial, and in practice it can be difficult to determine the relative roles of these influences as the presenting malocclusion is similar. Their prevalence differs between racial groups: 2- 4% in Caucasians while in afro-Caribbean reaching 10%.
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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