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2. malocclusion

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  • 1. Malocclusion
  • 2. Definition:
    Deviation from accepted normal occlusion is called Malocclusion.
    Is a condition that reflects an expression of normal biologic variability in the way the maxilla and mandible teeth occlude.(Bishara)
  • 3. An occlusion In which there is a malrelationship between the arches in any of the planes of the spaces or in which there are anomalies in tooth position beyond the limit of normal.( Walther & Huston)
  • 4. Classification
    Depending upon which part of the Oral & Maxillofacial Unit is at fault:
    Individual Tooth malposition ( Dental dysplasia )
    Malrelation of the dental arches or dentoalveolar segment ( Skeletodental dysplasia )
    Skeletal relationship ( skeletal dysplasia )
  • 5. Individual tooth malocclusion:
    These are malocclusion of individual tooth in relation to adjacent teeth within same dental arch.
    They are also called intra-oral malocclusion.
    Also includes condition like spacing or crowding within dental arch.
  • 6. 2) Malrelation of dental arch:
    These characterized by an abnormal relation between tooth or groups of teeth of one dental arch to the other arch.
    These occur in all the three planes of spaces namely:
    Sagittal plane
    Vertical plane
    Transverse plane
  • 7. Sagittal plane Malocclusion:
    Prenormal malocclusion:
    • Where mandibular dental arch is placed more posteriorly when the teeth meet in centric occlusion.
    Postnormal malocclusion:
    • where the mandibular dental arch is placed more distally when the teeth meet in centric occlusion.
  • B. Vertical plane Malocclusion:
    Deep bite or increase over bite.
    Open bite
  • 8. C. Transverse Malocclusion:
    These includes various types of cross bites due to constriction of the dentoalveolar or some other reason the relationship disturb.
  • 9. 3. Skeletal malocclusion :
    Caused due to defect in the underlying skeletal structure itself.
    The defect can be in Size, Position , or Relationship between the jaw bones.

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