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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

Bruxism

.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