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MUSCLES MALFORMATION AND MALOCCLUSION

 

    • Introduction
    • The primary etiologic sites of malocclusion are
    • Muscular system
    • Bone
    • Teeth and
    • Soft tissues (excluding muscles).
    • Among these factors Muscular system plays its primary role in the etiology of dentofacial deformity. The teeth and supporting structures are  constantly under the influence  of muscles of face and neck.  The active functional and resting forces of muscles are responsible  for the integrity of the dental arches and relations of the teeth to each other . Any aberration of these muscles will affect the integrity of the dental and skeletal structures and cause maloccluion.
  • CLASS I MALOCCLUSION
  • Muscle function is usually normal in cases of Class I malocclusion.. Some important exceptions, are-seen in the various types of open-bite. The greatest share of Class I open-bite problems may be attributed to
  • Thumb- and finger-sucking,
  • Rretained infantile swallowing habit or
  • Combination of both.
  • In class I malocclusion, finger habit was the first assault on the integrity of the dentition and that the adaptive and compensatory activities of the tongue and lip teamed up to provide a much more significant deforming mechanism.
  • Abnormal muscle activity can thus create a pseudo Class II, Division 1 malocclusion, even with harmonious anteroposterior jaw relations

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