Dentist's Commentary] To Avoid Regrets in Jaw Deformity Treatment! Explains the cost, length of hospital stay, and flow of treatment!

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Last updated on March 25, 2022


What is jaw deformity?

I was researching orthodontic treatment and came across...


Jaw deformity is a disorder of the jawbone that results in abnormal jawbone morphology and balance, leading to a collapse of facial morphology and bite alignment,

It is a condition that causes aesthetic and functional impairment.

For example...

An enlarged mandible results in a passive mouth, which ismandibular protrusionIt is called.

As the maxillary bone grows, it becomes bucktooth, which ismaxillary protrusionIt is called.

There is a left-right difference in the jawThe entire face can become distorted.The following is a list of the most common problems with the

Jaw deformities can be caused by a variety of factors, and in some cases surgery is required to treat them.

1) Causes of jaw deformities

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The causes of jaw deformity are many and varied, and in many cases the cause is less obvious. The following are generally considered to be the most common

Congenital Diseases

Some are born with a genetic problem that causes jawbone dysplasia.

Because cleft lip and palate, Crouzon's syndrome and Apert's syndrome cause midfacial dysplasia,

It causes inferior growth of the maxilla.

In Goldenhar syndrome, Treacher Collins syndrome, Robin sequence, etc.

It causes inferior growth of the mandible.

Acquired Diseases

Tumors, cysts, fractures, periapical inflammation, nerve disease, and irradiation in the jawbone can also cause jaw deformities.

especiallyJaw fractures in infancy and childhood are caused by a failure of jaw bone developmentcauses the

Local Causes

Childhood tooth loss due to congenital tooth defects or decaycan cause excessive jawbone development.

Vicious habits such as tongue protrusion and finger suckingcan cause open bite and maxillary prognathism.

Mouth breathing due to rhinitis, etc.leads to weakness of the perioral muscles, causing open bite and maxillary prognathism.

(2) Diagnostic criteria for jaw deformity

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To diagnose jaw deformity, we must first

Intraoral Examination

Intraoral Photographs

Regular radiographs and cephalographs (standard radiographs for orthodontic use)

Oral cavity model

and other materials, when there is a strong skeletal abnormality,Orthodontist's jaw deformity.and diagnosis.

Then, the materials were given to the oral surgeon,If a diagnosis of jaw deformity is made even on the part of the oral surgeonThe diagnosis is confirmed at

(iii) Insurance coverage for jaw deformities

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Skeletal abnormalities, as described above, and the orthodontist and oral surgeonJaw deformities are covered by insurance only when a confirmed diagnosis of jaw deformity is made.

Surgeries performed by oral surgeons, and before and after surgeryPreoperative and postoperative correction also covered by insuranceThe first two are the following.

You need to see an orthodontist first, though,Not all dentists who advocate orthodontics are able to diagnose whether or not jaw deformities are covered by insurance.

The diagnosis can be made only at a dental clinic that meets certain facility standards called a diagnostic facility for maxillofacial function,

If you would like to receive a diagnosis of whether or not you are covered by insurance, we recommend that you investigate in advance whether or not the dental office you are visiting meets the facility criteria before you visit.

It may be noted on the clinic's website whether it is a supported facility or not, but if not, it is a good idea to call beforehand to confirm.

4) Treatment of jaw deformities

Surgery Jaw Deformity

While some mild cases can be treated with orthodontic treatment alone, there are many cases that require surgical intervention.

If surgery is required,Orthodontists and oral surgeons work together, often combining orthodontic treatment before and after surgery.

Surgery is performed under general anesthesia and hospitalization is required. Regular checkups are required even after treatment is completed.

(5) Risks of treatment of jaw deformities

Surgery is always performed under general anesthesia.

Whenever surgery is performed for jaw deformities, it is always performed under general anesthesia.

In general anesthesia, the probability is very low, but it can be fatal.

Because jaw deformity surgery is not a direct life-threatening procedure,The risks must be fully understood and taken into account.

...cause nerve paralysis.

When surgery for jaw deformity is performed, it is primarily an artificial bone amputation procedure, which runs through the jawboneNerve damage may occur.

Nerve damage can cause nerve palsy.

After the surgery, many people experience temporary paralysis, but basically heal completely within a year.

The nerve that runs through the jawbone is called the trigeminal nerve and is mainly responsible for oral perception.

The nerve of thisNerve palsy can cause a loss of sensation in the oral cavity.

Infection after surgery

If you have undergone surgery for jaw deformityAlways hospitalizedThe first two are the following.

Hospitalization varies from 5 days to 2 weeks depending on the clinic, and may be longer if the degree of surgery or postoperative infection is severe.

6) Surgical procedures for jaw deformities

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Mild cases of jaw deformities can be treated with orthodontic treatment alone, though,

Surgery is indicated for severe cases or those with bone deformities.

There are various surgical procedures for jaw deformities, but the two main ones are as follows

Sagittal division of the mandibular branch

The mandible is divided perpendicularly to the body, separating the mandible into an outer portion that includes the articular process and an inner portion that does not.

The separated bone can accommodate any malocclusion of the mandible, as it can be moved back and forth and rotated vertically and laterally.

Indications are malgrowth and overgrowth of the lower jaw, asymmetry of the lower jaw and open bite.

Le Fort I osteotomy

The maxilla is cut horizontally with the body, the maxilla is completely divided, and the facial appearance and occlusion are moved to the ideal position,

This is a method of fixing.

poor anteroposterior or vertical growth of the maxilla, andCases of overgrowthis applicable.

Other surgeries include

Maxillary anterior alveolar osteotomy

By cutting the bone in the anterior portion of the maxillary bone and moving it posteriorly.Maxillary protrusion is indicatedwill be.

Vertical osteotomy of the mandibular branch

A vertical bone cut is made in the mandible from between the articular process and the muscular process to the inferior border of the mandible.

Mandibular prognathism and mandibular asymmetry areApplicable to.

It is less likely to cause nerve palsy than the sagittal division of the mandibular branch.

Alveolar osteotomy of the mandibular anterior teeth

By cutting the bone in the anterior portion of the mandible and moving it posteriorly.mandibular frontThe thrust is an indication.

Jawbone Extension

In this method, a bone lengthening device is placed during jaw osteotomy surgery, and bone lengthening begins after surgery to move the jawbone to the ideal position.

The sagittal segmentation of the mandibular branch and the Le It is used for jaw deformities that are difficult to treat even with Fort I osteotomy.


This is a method of correcting the position and morphology of the mastoid by horizontally osteotomizing the bone in the mastoid region and then shifting the bone fragments.

Abnormal morphology of the mussel adaptsand is most often performed in conjunction with other jaw deformity surgeries.

Please also refer to this page for specific surgical techniques😊.

It is also illustrated.

→directional marker or indicatorDepartment of Oral and Maxillofacial Surgery, Nagasaki University HospitalplaybackDepartment of Surgery Surgical Procedures for Jaw Deformities


Jaw deformity is due to abnormal jawbone morphology,In addition to esthetic disturbances, they also cause functional disturbances such as chewing, pronunciation, and breathing.

Some mild cases can be cured with orthodontic treatment alone, though,

Surgery is often required.

If jaw deformity surgery is required, theWith a good understanding of the risks and the need forWe recommend that you take it.

If you are looking for an orthodontist for jaw deformities, the official line is,

If you would like to talk to someone with similar concerns, please come visit us in our open chat room 😊.

imageWritten by dentist/issy

After graduating from the National School of Dentistry, he trained at the Tokyo Medical and Dental University Dental Hospital, and is currently working in general and orthodontic dentistry.

Member of the Japanese Society of Oral Implantology


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