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1. Cross Bite
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2. INDIAN DENTAL ACADEMY
Leader in continuing dental education
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3. Introduction
It is a term used to describe abnormal
occlusion in the transeverse plane
 A Cross bite represents the disturbances
in the bucco palatal or labio lingual
direction when brought into occlusion
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4. Classification of cross bite

A. Anterior Cross Bite
1.Single tooth
2.Segmental
B . Posterior Cross Bite
1.Unilateral
2.Bilateral
C. Based on the nature of bite as:
1. Skeletal
2. Dental
3. Functional cross bite
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5. Etiology of Cross Bite
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Retained deciduous tooth
Crowding and abnormal displacement of one or
more teeth
Presence of habits such as thumb sucking
Retarded growth of maxilla in both sagital as
well as vertical direction
Narrow upper arch due to decreased growth
stimulation in the mid palatal suture
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6. 
Collapse of maxillary arch as seen in cleft
palate

Sagital discrepancy of the jaws

Unilateral hypo or hyperplastic growth of
any jaw
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7. Anterior cross bite
Reverse overjet is seen

- single tooth or segmental
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8. Posterior Cross Bite
Abnormal transverse relationship between
upper and lower post teeth
 Lack of co-ordination in the lateral
dimension between upper and lower
arches.

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9. Buccal non-occlusion-Maxillary posterior occlude entirely on the
buccal aspect of mandibular posteriors
-Scissors Bite
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10. Skeletal Cross Bite

It occurs as a result of mal position or
malformation of the jaws

Generally characterized by narrow
maxillary arch
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11. Dental Cross Bite

Results due to localized disturbances
-Ectopic eruption of permanent
tooth
-Over retained deciduous tooth
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12. Functional Cross Bite
Presence of occlusal interferences
result in deviation of mandible during
jaw closure – Unilateral Cross Bite
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Habitual forward positioning of the
mandible
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13. 
Lingual non- occlusion
Maxillary posteriors occlude entirely on the
lingual aspect of mandibular teeth
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14. Differential diagnosis between
skeletal and dental cross bite
- Dental origin usually exhibits abnormal
buccal or lingual axial inclination
- Symmetry of dental arches on diagnostic
study model
- Determine if there is any lateral shift of the
mandible during closure
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15. Dentoalveolar
Crossbite with
good apical base
width
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16. 
Cross Bite with
deficient apical
base width
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17. Treatment
In primary dentition
If the inter molar width is satisfactory
- Elimination of deflective occlusal
contacts
If both molar and inter canine widths are
narrow
-Expansion of upper arch is indicated
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18. Early Mixed dentition
-Anterior Cross Bite
 Extracting the primary teeth if there
is not enough space
 If sufficient space is present Removable appliance is given
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19. 
Posterior cross bite
Removable or fixed appliance
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20. 
Late mixed dentition
Maxillary arch expansion
-Skeletal: opening the mid-palatal
suture
-Dental : fixed or removable
appliance
Single tooth cross bites:
cross elastics are used
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21. www.indiandentalacademy.com
Leader in continuing dental education
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