Chinthamani Laser Dental Clinic

Crossbite refers to a condition were one or more teeth may be abnormally malposed buccally or lingually or labially with reference to the opposing tooth or teeth.(Graber).Its also called as ‘Reverse bite’ or ‘reverse overjet’.

Anterior Crossbite Single tooth Multiple teeth or segmentalPosterior Crossbite Unilateral Bilateral Single tooth

Dental Anterior crossbite Posterior crossbiteSkeletal Anterior crossbite Posterior crossbite Functional crossbite

Anterior Crossbite: This is a condition in which one or more primary or

permanent maxillary incisors are lingual to the mandibular incisors.

Buccal Crossbite: Condition in which the maxillary posterior teeth is buccal to

the mandibular antagonist.

Lingual Crossbite: Condition in which the maxillary posterior teeth is lingual

to the mandibular antagonist.

Scissors bite or Telescopic bite: Mandibular teeth are entirely lingual to the

maxillary arch.

Anterior crossbite is a condition in which

one or more primary or permanent maxillary

incisor is lingual to the mandibular incisor.

a. Dental factors : A dental anterior crossbite is because of abnormal

axial inclination of the maxillary incisors. The reasons for abnormal axial inclination are: Trauma to primary teeth or to the permanent tooth

bud Over retained primary tooth Labially positioned supernumerary tooth . Inadequate arch length which causes lingual

eruption of permanent tooth Lip biting habit Repaired cleft lip

b. Skeletal factors : Skeletal crossbite results due to excessive

mandibular growth mandibular growth. It is genetic or inherited malocclusion. In children with cleft palates where there is

retrognathic maxilla.

c. Functional factors : A dental crossbite also occurs due to functional

interference of the mandible during closure. This is because premature tooth contact. This results or leads to pseudo-class III

malocclusion.

Loss of arch length as the adjacent teeth migrates.

Excessive wear to the teeth. Traumatic occlusion of the unlocked tooth. Development of pseudo-class III. Hence , all anterior crossbites should be treated

as early as possible.

Occlusal equilibration Inclined planes Fixed appliance Tongue blade therapy Expansion appliances with either screws Cantilever springs

A posterior crossbite is an abnormal buccolingual relationship of a tooth or teeth between maxilla and mandible when they are brought into centric occlusion.

a. Dental factors: Faulty eruption pattern where the tooth erupts

out of position Insufficient arch length over retained primary tooth Ectopic eruption Prolonged thumb or finger sucking

b. Skeletal factors: Asymmetric growth of maxilla or mandible

due to Inherited growth pattern Trauma Long standing functional problem Difference in align width in maxilla and

mandible due to Constricted maxilla Cleft palate

c. Functional or muscular crossbite : This is due to functional adjustments to tooth

interferences In this condition, muscular adjustments is more

when compared to dental crossbites . Functional analysis has to be done.

Abnormal wear of the dentition. Interference with normal growth and

development of dental arches. Pain due to muscle spasm. Possible damage to periodontium.

Crossbite elastics Coffin spring Quad helix Rapid maxillary expansion Removable plates Fixed appliances

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