What is the Mandibular Prognathism?

We speak of mandibular prognathism when the lower teeth are in front of the upper teeth and do not fit. It has three main causes:

  • Lack of growth of the upper jaw (maxillary hypoplasia)
  • Jaw overgrowth (mandibular hyperplasia)
  • A combination of maxillary hypoplasia and mandibular hypoplasia


We often find a combination of both: undergrowth of the upper jaw and overgrowth of the lower jaw. It is because the mandible stimulates the growth of the upper jaw and if in adolescence there is mandibular prognathism, the jaw does not grow as necessary and ends in insufficient growth of the maxilla.

Types of Prognathism

Mandibular prognathism is usually associated with a class III dental occlusion, and with different facial patterns. We can have a prognathism with a long face, or with a short face. Prognathism with open bite or overbite. Prognathism with or without posterior crossbite. Symmetrical prognathism or facial asymmetry.

Therefore, depending on the type of prognathism, we develop an appropriate treatment plan for each circumstance.


Surgical Steps

Orthognathic surgery is the treatment of the cause of the problem and requires orthodontic preparation prior to and after surgery. In prognathism, it is possible that a Surgery First protocol can be applied, in which the pre-surgical orthodontic preparation is very short and most of the orthodontics is concentrated in the postsurgical phase.

Orthognathic surgery for prognathism can sometimes be monomaxillary. In this case and especially in women, the facial aesthetic result is better with a maxillary advance rather than a mandibular setback, especially if there is a lack of support in the area of ​​the middle third of the face and cheekbones. Very frequently the orthognathic treatment consists of a bimaxillary surgery, especially if there are deviations from the midline, or we want to change the mandibular plane with hourly rotations (on short faces) or anticlockwise (on long faces).

As always, orthognathic surgery for prognathism can be associated with mentoplasty or rhinoplasty, or augmentation of the cheekbones or lips. Treatment is based on virtual planning, which allows us maximum precision, minimum morbidity and quick recovery 

Our Recommendations

Why have an operation at Birbe Clinic?

We are specialists in designing faces and smiles.


At Birbe Clinic we have a great team, mentored by Dr. Joan Birbe, with more than 20 years of experience treating patients; always up to date with news and selecting the innovations that really bring improvements to our treatments. As in the case of virtual simulations of facial surgeries, intraoral scanners, customization of facial prostheses, the use of the microscope, etc.


Our priority is to achieve excellence in treatment. All this with a personalized, honest and trustworthy treatment. In addition, our facilities offer maximum hygiene, sterilization and comfort.

We help you carry out the intervention you need

After a rigorous evaluation we will offer you a personalized and closed estimate with all the necessary forms of payment and financing, so that you can carry it out.

Contact Us

Contact us during our business hours of:

  • Monday, Thursday and Friday from 8.00h to 16.00h.
  • Tuesday and Wednesday from 8.00h to 18.00h.
  • Phone Number: +34 93 212 47 37.


Outside of our business hours you can send us a WhatsApp or a form and we will answer you as soon as possible. Being located in Barcelona, ​​we receive patients from all over the national and international territory.


During your first consultation we will provide you with:


Personal diagnosis by oral and facial examination.

✔ Closed estimate with different financing possibilities.

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