Bimaxillary protrusion
Introduction
Introduction to bimaxillary protrusion Bimaxillary protrusion is a more common sagittal malocclusion in orthodontics. According to the literal understanding, the bimaxillary protrusion refers to the simultaneous protrusion of the upper and lower jaw bones, but the more common clinical situation is the simple bimaxillary dentoal verolar protrusion, or the double arch arch anterior with the abnormal position of the upper and lower jaw, molar relationship All are neutral, the anterior teeth cover is basically normal, and the lateral shape is convex. We usually refer to the above two cases as a bimaxillary protrusion. The disease is caused by genetic factors, and bad oral habits, abnormal lip and tongue muscle dynamic balance, diseases can cause this disease. basic knowledge Sickness ratio: 0.01%-0.02% Susceptible people: no specific population Mode of infection: non-infectious Complications: oral diseases
Cause
Cause of bimaxillary protrusion
The disease is caused by genetic factors, and bad oral habits, abnormal lip and tongue muscle dynamic balance, diseases can cause this disease.
Prevention
Double jaw protrusion prevention
Bimaxillary protrusion is not common in clinical practice. Because the teeth are arranged neatly and without parental attention, the best period of correction is often missed. It is more common in adults to seek treatment in adults. This disease is caused by genetic factors, and bad oral habits. Abnormal lip and tongue muscle dynamic balance, disease can cause this disease, suffering from this disease, often can cause lip protrusion, seriously affecting the appearance of beautiful, mental health, and can be accompanied by mouth breathing, resulting in easy dry mouth, affecting sleep, Should be treated early to stop mouth breathing, the disease is easier to diagnose, if the patient is in the growth and development period, it is feasible to reduce the number of orthodontic treatment, often can receive a good correction effect, adult patients, if the orthodontic treatment, feasible double jaw surgery treatment.
Complication
Bimaxillary protrusion Complications, oral diseases
Suffering from this disease, it can often cause lip protrusion, which seriously affects the appearance and appearance, mental health, and can be accompanied by mouth breathing, causing the mouth to be easy to dry, affecting sleep, and should be treated early to stop mouth breathing.
Symptom
Bimaxillary protrusion symptoms Common symptoms Mandibular anterior process jaw deformity molars
1. Both the upper and lower jaws protrude forward.
2. The long axis of the tooth has a large slope and the upper and lower lips are relatively short.
3. The front teeth are exposed to the outside of the mouth, and there is a phenomenon of open lips and teeth.
4. The lordosis is not limited to the teeth, and the alveolar process also protrudes forward, and the arrangement of the teeth is generally neat.
5. The anterior teeth are superficially covered, even in pairs, the lips are not easy to close; the force is closed as if the mouth is full of food.
6. Those who have a mouth breathing habit, the lower third of the face is raised.
Examine
Double jaw protrusion
The "A" item is the main test, especially the X-ray cephalometric measurement of the lateral slice is important.
Diagnosis
Diagnosis of bilateral maxillary protrusion
diagnosis
1. The molars are neutral, the upper and lower alveolar bones or the upper and lower dental arches protrude forward, the middle part of the face protrudes forward, and the open lip is toothed. When the lips are closed, the mouth is full of food.
2. X-ray cephalometric measurement of SNA angle, SNB angle is greater than normal, such as the arch of the protrusion of the SNA angle and SNB angle is normal, but -- SN is less than normal, T-NP is greater than normal.
Differential diagnosis
Identification with the skeletal jaw protuberance.
Evaluation of the position of the ankle and SNS angle, mandibular depth, can identify the mandibular alveolar protrusion and mandibular protrusion, evaluation of SNS angle and maxillary depth can identify the maxillary alveolar protrusion and maxillary protrusion.
