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. The pathophysiological bases of the abnormal growth are discussed. Hugo Obwegesr and Makek classified condylar hyperplasia into three categories, hyeprplasia in the table below. The etiology of HH is still under discussion.

Journal of Maxillofacial Surgery. The gonial angle was characteristically rounded off, and the mandibular canal was displaced to the lower border of the mandible Fig 1c.

Separation and characterization of the cellular elements”. OPG Click here to view. International Journal of Clinical and Experimental Medicine. Hemimandibular hyperplasia is a developmental asymmetry characterized by three-dimensional enlargement of half of the mandible.

The explanations are demonstrated by the illustrations of some cases.

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The cells are large, the cytoplasm is vesicular, and there is abundant newly produced cartilage matrix between cells. Hugo Obwegeser et al. A panoramic radiograph revealed a discrepancy in size and morphology between the right and left condyles, enlargement of the right condyle, and elongation of the right ascending ramus, as well as an enlargement of the skeletal base of the right hemimandible in all its dimensions, together with a downward growth.

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None, Conflict of Interest: The authors present their experience on the basis of this proposed classification and treatment algorithm with functional and aesthetic outcomes as the end points of this study.

The panoramic radiograph demonstrates readaptation of the condyle in the fossa Fig 1g. An early high condylectomy was performed.

Condylar hyperplasia can be considered to be the end result of primary cartilage formation and secondary bone replacement.

Hemimandibular hyperplasia: classification and treatment algorithm revisited.

Developmental asymmetries include agenesis, hypoplasia, hyperplasia, atrophy, hypertrophy and malpositions of the facial bony structures. Annals of Maxillofacial Surgery.

The unilateral increase in height of the face on the affected side results in a sloping rimaoris or mouth and rotated facial appearance.

Bone scanning, a tracer method based on the injection of phosphates labeled with hyperplaisa radionuclide, is a noninvasive technique to evaluate whether the condylar growth is still active. Eve, May 15th, 1. Fig 2c Posteroanterior cephalogram of the patient showing the inferior displacement of the mandibular angle and the ipsilateral compensatory maxillary growth.

The lower border of the mandible is bowed downward and positioned at a lower level than that on the normal side, clearly demonstrated by an increased distance between the dental roots and hyperplqsia alveolar canal. Different histological patterns hemiamndibular the condylar growth zone were seen in the two anomalies.


The most common form of condylar hyperplasia is unilateral condylar hyperplasia where one condyle overgrows the other condyle leading to facial asymmetry. Few reports are available regarding the long-term follow-up of patients affected by HH who have undergone early high condylectomy. Fig 2f Posteroanterior cephalogram showing the skeletal symmetry after orthognathic surgery.

Hemimandibular elongation, hemimandibular hyperplasia, facial asymmetry. The chin is shifted to the normal side.

Normally, the dental midline is deviated toward the unaffected side but may also be centered, depending on the vector and speed of growth. All these findings are particularly noticeable in comparison with the unaffected side. From a hemiimandibular point of view, the affected condyle is covered by a very broad layer of fibrocartilage.

Condylar hyperplasia – Wikipedia

In addition, in view of potential complications arising from condylectomy, none of the patients had undergone condylectomy as part of the surgical treatment. Fig hemimandibularr Patient’s lateral movement 12 years after surgery.

One theory states that an event of a trauma leading to increase in number of repair mechanism and hormones in that area may lead to increase in growth of mandible on that side.

The patient’s parents declined postoperative orthodontic therapy to correct the deep bite.