Premature loss of deciduous dentition due to caries, trauma, sucking habits, poor lip positioning, tongue thrusting and incorrect swallowing, mouth breathing are the most common causes of acquired jaw anomalies. They occur early in the deciduous dentition and if not treated a majority of patients display significant deformities in the mixed dentition.

Retrusion of the lower jaw

Protruding upper jaw

Open bite

Flared teeth or spaces between the upper anteriors

Leads to compensatory tongue thrusting

Tongue and lower lip will be positioned between the teeth impairing aesthetics

Causes protruding upper front teeth with retrusion of lower lip

Inability to bite or chew properly, develops swallowing and speech defects develops a lisp and breathes through the mouth instead of the nose which leads to frequent colds

Open bite in anterior region

Proclination of upper anterior teeth

Protrusion of anterior segments of both arches with spaces between incisors and canines

Narrow and constricted maxilary arch - posterior crossbite

Mouth breathing

Mouth breathing usually results when nasal passage is obstructed or inadequate for respiratory exchange. An altered respiratory pattern eg. in mouth breathing could alter the posture of head, jaw and tongue and the equilibrium of pressures on the jaws and teeth and affect both jaw growth and tooth position.


Including clenching, grinding and tapping of the teeth occurs during sleep from disruption of normal physiologic rest position of mandible resulting from the forceful rythmic contraction of masseter, temporalis and lateral pterygoid causes .Tooth mobility due to occlusal trauma of bruxism .Dull percussion sounds and soreness to biting stress .Non functional pattern of occlusal wear .Increased sensitivity from excessive abrasion of enamel .Tenderness of jaw muscles on palpation.

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