Crossbite

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Overview

Crossbite is an occlusal irregular condition where a lower tooth has a more buccal position than the antagonist upper tooth. Crossbite can involve a single tooth or a group of teeth. Crossbite can be classified as anterior or posterior.

• Anterior crossbite can also be referred as negative overjet, and is typical of class III skeletal relations (Progenism).
• Posterior crossbite is often correlated to a narrow maxilla and upper dental arch. A posterior cross-bite can be unilateral or bilateral.

Unilateral cross-bite often determines a lateral shift of the mandibular position, which can become structural if left untreated for a long time during growth, leading to skeletal asymmetries.

Further Classification and Related Terminology

Buccal Crossbite

Buccal crossbite is due to the buccal displacement of the affected tooth or teeth as it relates to the antagonistic tooth or teeth in the posterior segments of the arch.

Lingual Crossbite

Lingual crossbite is due to the lingual displacement of the mandibular affected tooth or teeth as it relates to the antagonistic tooth or teeth.

Palatal Crossbite

Palatal crossbite is due to the palatal displacement of the maxillary affected tooth or teeth as it relates to the antagonistic tooth or teeth.

Complete Mandibular Buccal Crossbite

Complete mandibular buccal crossbite is present when all the mandibular teeth are lingually positioned to the maxillary teeth due to a narrower mandibular arch than the maxillary arch.

Complete Maxillary Palatal Crossbite

Complete maxillary palatal crossbite is present when all the maxillary teeth are palatal to the mandibular arch due to the narrower maxillary arch.

Both complete mandibular buccal crossbite and complete maxillary palatal crossbite could be referred as scissors bite.

Complete Crossbite

Complete crossbite is found when all teeth in one arch are positioned either inside or outside to the all teeth in the opposing arch.

Scissors-bite

Scissors-bite is present when one or more of the adjacent posterior teeth are either positioned completely buccally or lingually to the antagonistic teeth and exhibit a vertical overlap.

Anterior crossbite

Anterior crossbite is a malocclusion in which one or more of the upper anterior teeth occlude lingually to the mandibular incisors; the lingual malpositions of one or more maxillary anterior teeth in relation to the mandibular anterior teeth when the teeth are in centric relation occlusion.

Posterior Crossbite

Posterior Crossbite is one or more posterior teeth locked in an abnormal relation with the opposing teeth of the opposite arch; can be either buccal or a lingual cross-bite and may be accompanied by a shift of the mandible.

Centric occlusion

Centric occlusion is a static reproducible position of the mandible in which there is maximal contact of the inclined planes of the opposing teeth with balanced, unstrained relationship in the temporomandibular articulation.

Treatment

There are several therapies that can be used to correct a cross bite:

• Multibrackets therapy (braces),
• Quad-Helix,
• Hirex,
• Removable Plates,
• Invisalign,
• Delaire Mask.

The correct therapy should be decided by the orthodontist depending on the type and severity of the crossbite.

Image Gallery

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  Unilateral Posterior Crossbite

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  Crossbite

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  Crossbite

External links

http://www.braceface.com/Crossbite2.htm

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