The biggest face change caused by orthodontics is called sub-face 1/3. The so-called interdependence of lips and teeth, the coordination between teeth, lips and face and jaw is the key to determine whether Subfacial 1/3 is soft or not. If you want a perfect contour, the chin plays an important role.

Many people have no chin when they say it. Sometimes, it's not really a chin, but a sudden opening leads to a hidden chin.

There are several main reasons for chin retraction. You can see if you have this situation.

Especially the Gonta of maxillary and mandibular teeth is narrow. Patients with this kind of dental arch stenosis generally have the problem of abnormal lingual muscles. Normally, when we relax, our tongues are close to the upper jaw. You can also relax and feel it now.

If the tongue muscle is abnormal and the position of the tongue cannot be raised, the dental arch will be squeezed by the strength of the buccal muscle and the dental arch will be narrowed. If the maxillary arch is narrow and the mandibular protrusion is blocked, it will be forced to retreat, resulting in mandibular retraction.

Because of the growth of teeth, the mandibular teeth recede and the maxillary teeth protrude, which is what everyone calls deep overbite. Therefore, friends who have no chin can also observe whether they have deep overbite and see if they have the conditions to correct the occlusion of their teeth and correct their chin.

Overdevelopment of the maxilla will also lead to the alveolar bone protruding forward, and the soft tissue of the chin will be lifted upward, making the chin shorter and uneven walnut lines appear. When the lips are closed, the chin muscles will be tense, which is visually manifested as maxillary protrusion and chin retraction.

Breathing air through the mouth enters the trachea through the mouth, and the tongue is no longer close to the upper jaw. When the position of the tongue is pressed down, the space of the mouth becomes larger, and the tip of the tongue pushes against the teeth, resulting in the teeth being forced outward all the time and gradually forming convex teeth; As a result, the maxilla is upturned, the oral space is enlarged, and the chin is gradually retracted.

5. High angle profile (the plane angle of mandibular angle is too large) leads to mandibular retraction.

A high facial height means a high vertical mandibular development and a naturally high facial height. Generally, patients with high angle/vertical growth have steep curve of mandible, long proportion under the face, protruding, mandibular retraction and chin retraction.

In order to give you a more intuitive understanding, I have prepared several different types of cases to see which one you belong to.

According to the film examination, the lady found that there was obvious deep overbite+maxillary protrusion+mandibular retraction, and the lower third was shorter.

Based on oral data and women's demands, the plan of not extracting teeth was finally determined. Using the existing method of molar traction and arch expansion to obtain the gap, raising the posterior teeth and depressing some anterior teeth to solve the problem of deep overbite.

In addition, the auxiliary anchorage nail retracts the upper and lower front teeth, opens the occlusion, releases the locked mandible, and pulls out the chin. At the same time, the height of 1/3 was obviously changed, the oral process and chin retraction of the lady were relieved, and the normal occlusal relationship was restored. The lady herself is very satisfied with the result.

If you also have a short jaw of 1/3, you can check whether there is a deep overlap. Maybe you already have a good-looking jaw, but it is hidden because of the wrong occlusion. Correcting malocclusion may improve it.

The lady complained that she had a gap, a protruding mouth and no chin, and her mental muscles were tense when she shut up. After oral examination, it was found that the occlusal relationship of her posterior teeth was good, with a narrow gap of1.5 mm.

According to the patient's chief complaint, illness and the will to remove orthodontic teeth, she was designed to remove wisdom teeth, so that the existing gap and wisdom tooth space were moved and expanded, and the protrusion was improved by retraction, so that the mandibular plane rotated counterclockwise and the chin shape was improved.

After 265,438+0 courses of treatment, the oral process and chin shape were improved, the dentition space was closed, and the occlusion returned to normal, which achieved the satisfaction of patients.

The lady complained of irregular teeth, protruding mouth and no chin. Clinical examination showed that she was skeletal Class II, with high angle, prominent outline and backward chin.

According to the oral data and women's demands, the problem of no chin was solved by extracting teeth, adducting, adjusting the plane position of posterior jaw, adducting upper and lower anterior teeth, and rotating mandible counterclockwise.

Patients with high angle are easy to lose anchorage of posterior teeth, so we use TPA and implant anchorage in maxilla to prevent anchorage loss. It lasted for 2 years, and the orthodontic effect was very satisfactory, both from the patient and myself.

The patient complained that he had a protruding mouth and no chin, but in fact, I knew at a glance that the most fundamental reason for his protruding mouth was the Queen Mother of Chin.

At that time, the plan given to her was to pull out the top two No.5 teeth, because she had just fallen off her false teeth and then wanted to adduce more, so this would not only help him adduce his teeth, but also save her the cost of a false tooth.

Mandibular extraction of two No.4 teeth, because it is necessary to adducte more front teeth and improve the shape of the chin, so when extracting teeth, choose a little forward, and the upper and lower teeth are designed with moderate anchorage. After correction, the oral process without chin has been improved very well and looks very beautiful. The patient is very satisfied with the final correction result.

Therefore, in order to get a beautiful face and a beautiful chin, orthodontics must not be ignored. Teeth affect the overall image of the mouth, chin and face.

# Orthodontics #