Crowding

Definition: Crowding is the irregularities of teeth due to adequate space in the arch for normal alingment. Usually manifested by imbrications, displacement, impaction, rolation, tilts etc.

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Cause
A.
 Dentoalveolar disproportion.
 
i.
   Narrow dental base
 
ii.
   Short antero-posterior base
 
iii.
   Large teeth
 
iv.
   Anterior component force
B.
 Soft tissue morphology and behaviour.
 
i.
   Incompetent lip
 
ii.
   Atypical tooth apart swallowing
 
iii.
   Thumb or lower lip sucking habit.
C.
 Dental base relationship or skeletal pattern.
 
i.
   Lip pressure
 
ii.
   Lower arch short
D.
 Forward developmental position of the buccal teeth.
E.
 Early lose of deciduous teeth.