Mandibular retraction

Introduction to mandibular retraction Mandibular retraction is a malocclusion of the mandibular retraction caused by mandibular hypoplasia or congenital absence of the lower anterior teeth and pterygopalatine dysfunction. Mandibular constriction deformity is not common, and it can often be confused with maxillary protrusion. The appearance is mainly characterized by short mandibular ankle, short 1/3 of the face, and the side looks like a "bird's beak", which seriously affects the appearance and appearance. Mental health, the disease is mostly caused by mandibular hypoplasia or congenital lack of anterior teeth and pterygopalatine dysfunction. The treatment must be based on the age of the patient. Different methods are available for patients in the growth stage. Adult patients can be treated with orthodontic treatment. Adult patients Feasible orthognathic surgery. basic knowledge The proportion of illness: 0.005% Susceptible people: no specific population Mode of infection: non-infectious Complications: mandibular retraction

Cause of mandibular retraction

Mandibular retraction is the lower jaw located behind the normal maxilla, usually including small jaw deformities caused by developmental disorders.

The cause of mandibular retraction:

(1) congenital developmental disorders: such as the first, patients with bilateral arch syndrome, bilateral or unilateral mandibular, mandibular ascending branch and body are also involved, and sometimes hearing bone also developed;

(2) inflammation: such as rheumatoid arthritis, adjacent otitis media will affect the development of the condyle and jaw;

(3) genetic factors: some mandibular retraction deformities have a clear family history;

(4) Trauma: Mandibular and condylar trauma can cause mandibular developmental disorders.

Mandibular retraction prevention

Mandibular constriction deformity is not common, and it can often be confused with maxillary protrusion. The appearance is mainly characterized by short mandibular ankle, short 1/3 of the face, and the side looks like a "bird's beak", which seriously affects the appearance and appearance. Mental health, the disease is mostly caused by mandibular hypoplasia or congenital lack of anterior teeth and pterygopalatine dysfunction. The treatment must be based on the age of the patient. Different methods are available for patients in the growth stage. Adult patients can be treated with orthodontic treatment. Adult patients Feasible orthognathic surgery.

Mandibular retraction complications Complications

It is easy to cause the volume of the oral cavity to shrink, and the tongue to fall back, which is characterized by obvious snoring and even suffocation during sleep.

Mandibular retraction symptoms Common symptoms Mandibular retraction tooth pain gum swelling masseter muscle hypertrophy

1. The oral model of the mandibular retraction is similar to that of the maxillary protrusion. The deep anterior teeth are often covered with deep lamination. The difference is that the maxillary position is normal and the mandibular condyle is retracted.

2. X-ray cephalometric measurement shows that the SNB angle and face angle are smaller than the normal range, the ANB angle is larger than normal, and the SNA angle is normal.

[clinical manifestations]

1. The mandibular retraction, the position of the upper jaw is basically normal, the anterior teeth are deeply covered, the upper anterior teeth are obviously inclined, the lower anterior teeth are bitten on the upper anterior teeth bulge or the sacral mucosa, and the lower lip is attached to the upper anterior teeth. Face, the occlusal relationship of the posterior teeth is far-integrated.

2. The mandible is retracted, the anterior teeth are deeply covered, the upper anterior teeth are bitten on the lower anterior teeth and the lower anterior teeth are bitten on the upper iliac mucosa, and the posterior teeth are occluded.

3. The mandibular retraction, the lower arch is smaller than the upper arch, the lower third of the face becomes shorter, and the lateral view of the lower jaw is more retracted.

4. For the upper anterior teeth, the upper anterior teeth are exposed to the outside of the mouth, and the side looks like the lower jaw and the ankle are retracted, and the upper and lower jaws are disproportionate.

Mandibular retraction

The mandibular retraction should be examined by X-ray cephalometric film.

Diagnosis of mandibular retraction

Feasible diagnosis based on clinical manifestations and X-ray cephalometric measurements.

Simple, mild mandibular retraction needs to be differentiated from true maxillary protrusion.

In patients with true maxillary protrusion, the facial part is relatively long, and the distance from the upper lip to the upper incisor is more than 4 mm. The correct identification depends on cephalometric analysis.

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