Overdevelopment of the jaw

Introduction Excessive jaw development is a clinical manifestation of anterior teeth reversal. The anterior teeth are reversed, and the lower anterior teeth are located on the labial side of the upper incisors to become the anterior teeth. There may be individual anterior teeth reversal and most anterior teeth reversal. Individual anterior reflexes refer to the reciprocal of single or 2 teeth, while most anterior reflexes refer to more than 3 anterior and contralateral teeth. relationship. Due to poor breastfeeding posture, the anterior teeth of the anterior teeth are retained or lost early, the congenital loss of the upper permanent incisors, the bad habits, insufficient abrasion of the cuspidal teeth, systemic diseases and hereditary mandibular protrusion.

Cause

The abnormal relationship between the upper and lower arch of the upper and lower arch can be manifested as mandibular protrusion, mesial and anterior teeth. Due to poor breastfeeding posture, the anterior teeth of the anterior teeth are retained or lost early, the congenital loss of the upper permanent incisors, the bad habits, insufficient abrasion of the cuspidal teeth, systemic diseases and hereditary mandibular protrusion. Due to the degree of difference, the anterior teeth can be reversed, the molars are neutral, and in severe cases, the anterior teeth are reversed, the posterior teeth are close to the middle and the mandibular protrusion is present at the same time.

an examination

Related inspection

Maxillofacial examination of mandibular movement for maxillofacial five-dimensional CT examination

Tooth origin

Mostly due to local obstacles in the process of tooth eruption or replacement, it often appears as a simple anterior teeth. The anti-overlay is small, and the molars are neutral or close to neutral. The shape and size of the mandible are basically normal, there is no obvious abnormality in the upper and lower jaws, the ankle is not protruding, and the face is basically normal. The lower jaw can retreat to the anterior teeth to the blade. X-ray cephalometric measurement of bone morphological abnormalities, easy to correct, good prognosis.

2. Osteogenic

Due to factors such as heredity and disease, in addition to the anterior teeth, it often shows a large anti-overlay. The molars are near-middle and are accompanied by jaw deformities. It can be characterized by blunt mandibular angle, long mandibular body, short mandibular branch or insufficient development of the anterior maxilla. The ankle is obviously protruding, and the lower jaw often cannot retreat on its own. The face is mostly concave, sometimes accompanied by open jaw deformity. It is difficult to correct, and the effect of simple orthodontic treatment is not necessarily good.

This type of anterior teeth can be divided into 3 types according to the mechanism:

(1) The anterior maxilla is underdeveloped and the mandibular development is normal.

(2) The maxillary development is normal and the mandible is overdeveloped.

Differential diagnosis

Dislocation of the jaw: The dislocation of the jaw is caused by a fracture of the jaw.

Jaw joint pain: Jaw joint pain is a manifestation of temporomandibular joint disorders.

The jaw was "fan-shaped" bone destruction: X-ray examination showed that the jaw was "fan-shaped" bone destruction, and the edge was worm-like as one of the main symptoms of gingival cancer.

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