Orthognathic Surgery Class 2 or Mandibular Retrognathia

What is Mandibular Retrognathia and how is it treated?

Mandibular retrognathism, derived from the Latin word retro, meaning “backwards" and the Greek word, gnathos, meaning “jaw”, is a facial deformity which is described as the presence of an anteroposterior discrepancy between the mandible and the maxilla. Both jawbones are misaligned.

In cases of mandibular retrognathism, the mandible is underdeveloped in relation to the maxilla. In dental terminology, mandibular retrognathism is also called class II.

HOW TO tell IF I HAVE MANDIBULAR OR CLASS 2 RETROGNATIA

 

The disharmony between both structures gives the patient’s facial features an inharmonious appearance, which is especially noticeable in profile, and there is a lack of forward projection. Furthermore, the impact of mandibular retrognathism is not only aesthetic: for example, many patients who have this type of malformation suffer from Sleep Apnoea, a condition that negatively affects their quality of life.

Mandibular retrognatia is diagnosed when:

  • The mandibular bone presents abnormal underdevelopment with respect to the maxilla, which is considered a skeletal problem.
  • The chin is receded, that is, it lacks forward projection.
  • The problem is dental.

Why treat mandibular retrognathia or class 2

Orthognathic surgery as Mandibular retrognathism or class II solution, apart from restoring patients'quality of life by solving functional issues such as masticatory problems or more serious conditions such as Sleep Apnoea,  also re-establishes the aesthetic balance between the maxilla and the mandible.

TREATMENTS FOR CLASS 2 OR MANDIBULAR RETROGNATIA

  • Bimaxillary orthognathic surgery, where the maxillofacial surgeon needs to operate on both the mandibular and the maxillary bone, or monomaxillary orthognathic surgery, where the surgeon acts on only one of the two skeletal structures. Depending on the case, orthognathic surgery should be accompanied by orthodontic treatment.
  • Mentoplasty, or chin surgery.
  • Orthodontic treatment.