Laterognathia (hemi-mandibular elongation) The characteristic of hemi mandibular hyperplasia is facial asymmetry (oversized lower face on one side). Hemimandibular hyperplasia (HH) is a developmental asymmetry characterized by three-dimensional enla. Hemimandibular hyperplasia is a developmental asymmetry characterized by three-dimensional enlargement of half of the mandible.6 The hyperplastic side.

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This is always manifested in the premolar and molar area.

Fig 1e Patient’s lateral movement 12 years after surgery. Hemimandibular hyperplasia treated hemimandibulaar early high condylectomy: Clinical and radiographic experience as well as histological findings leave no doubt that the term “condylar hyperplasia” refers only to hyperplasia of the condyle alone and should therefore not be used to mean the two hemimandibular anomalies as is the hypeerplasia in the literature today.

There are two basically different malformations of one side of the mandible which we call hemimandibular hyperplasia and hemimandibular elongation respectively.

In fact, if surgery is delayed until the end of growth, the surgeon will be unable to take advantage of the spontaneous remodeling of the tissues obtained during growth with a single condylectomy. Few reports are available regarding the long-term follow-up of patients affected by HH who have undergone early high condylectomy.

The maxilla usually follows the mandible and grows downward on the affected side. Journal of Oral and Maxillofacial Surgery. Fig 2a Patient’s preoperative frontal view.


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The fibrocartilaginous layer is distributed in a diffuse but regular manner all hyperplasla the condylar head. The condyle seems to be an essential element for normal mandibular growth and development. Clinical and radiographic findings were consistent with a diagnosis of right hemimandibular hyperplasia.

It is a yhperplasia without a definitive etiology. Fig 2c Posteroanterior cephalogram of the patient showing the inferior displacement of the mandibular angle and the ipsilateral compensatory maxillary growth. The hyperplastic side includes the condyle, condylar neck, ramus and corpus, and the anomaly terminates at the symphysis. Excursion and protusive movements were not restricted. In our opinion, the esthetic and functional results after this long-term follow-up are fairly satisfactory.

However, in the case of condylar hyperplasia, the pathogenesis of the excessive formation of cartilage and bone still remains unknown.

Hemimandibular hyperplasia: classification and treatment algorithm revisited.

PA cephalometry, panoramic radiograph, and nuclear imaging are some of the techniques that can be used for diagnosis. There was no history of trauma or inflammatory disease. Retrieved from ” https: American Journal of Orthodontics and Dentofacial Orthopedics.

Maxillomandibular fixation was performed for 10 days, and a 6-month period of physical therapy was done to rehabilitate the TMJ. Severe facial asymmetry is evident.

Hemimandibular hyperplasia–hemimandibular elongation.

From a histologic point of view, the affected condyle is covered by a very broad layer of fibrocartilage. Generally, the abnormal growth of the mandible ceases at the same time as the completion of general growth. Facial asymmetry, defined as a difference in the size, shape or relationship of the two sides of the face, has a high correlation with facial harmony, attractiveness and beauty.


Fig 2e Panoramic radiograph after extensive orthognathic surgery involving the maxilla Le Fort I osteotomythe mandible Obwegeser-Dal Pont osteotomythe chin, hyperplasiw lower border of the right mandible, and the condyle condylectomy. Hemimandibular hyperplasia HH is a developmental asymmetry characterized by three-dimensional enlargement of one half of the mandible.

Korean Journal of Orthodontics.

Fig 1f Patient’s frontal view 12 years after the operation. This case report shows some important modifications in the facial skeleton, and quite good functional and esthetic results, obtained in a year-old patient treated by early high condylectomy, without pre- or postsurgical orthodontic therapy. Sitemap What’s New Feedback Disclaimer. Indian J Oral Sci ;6: In the case of young patients with HH, this procedure should be performed as soon as possible to prevent the development of an oblique occlusal plane and ipsilateral compensatory maxillary growth 9—12 and to improve symmetry by the spontaneous remodeling processes in the facial structures.

Histologically, the hyperactive growth includes the whole fibrocartilaginous layer.