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