Hemimandibular hyperplasia.

Crainofacial Center, Department of Plastic and Reconstructive Surgery, Taipei, Taiwan, Republic of China.
Plastic &amp Reconstructive Surgery (Impact Factor: 3.54). 05/1996; 97(4):730-7. DOI:10.1097/00006534-199604000-00007
Source: PubMed

ABSTRACT True hemimandibular hyperplasia is an uncommon maxillofacial deformity. Patients with this affliction present clinically with varying degrees of asymmetry characterized by an increase in ramus height, a rotated facial appearance with kinking at the mandibular symphysis, and prominence of the lower border of the mandible. In the advanced form, maxillary and mandibular alveolar bone overgrowth result in a compensatory canting of the occlusal plane and a significant functional malocclusion requiring bimaxillary surgical correction. Nine patients with the above condition were treated with various surgical methods over a 9-year period. The clinical results were satisfying and the long-term results showed good postoperative stability. The pathology of hemimandibular hyperplasia is described and the preexisting nomenclature further defined.

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    ABSTRACT: Hemimandibular hyperplasia (HH) and hemimandibular elongation (HE) anomalies present with facial asymmetry and deranged occlusion. Currently, diagnosis and assessment of the facial dysmorphology is based on subjective clinical evaluation, supported by radiological scans. Advancements in objective assessments of facial asymmetry from three-dimensional (3D) facial scans facilitate a re-evaluation of the patterns of facial dysmorphology. Automated, robust and localised asymmetry assessments were obtained by comparing a 3D facial scan with its reflected image using a weighted least-squares superimposition. This robust superimposition is insensitive to severe asymmetries. This provides an estimation of the anatomical midline and a spatially dense vector map visualising localised directional differences between the left and right hemifaces. Analysis was conducted on three condylar hyperplasia phenotypes confirmed by clinical and CT evaluation: HH; HE; and hybrid phenotype. The midline extraction revealed chin point displacements in all cases. The upper lip philtrum and nose tip deviation to the affected side and a marked asymmetry of the mid face was noted in cases involving HE. Downward and medial rotation of the mandible with minor involvement of the midface was seen in the HH associated deformity. The hybrid phenotype case exhibited asymmetry features of both HH and HE cases.
    International Journal of Oral and Maxillofacial Surgery 06/2012; · 1.52 Impact Factor
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    ABSTRACT: The purpose was to report the clinical experience with patients diagnosed with Condylar Hyperplasia (CH). Eighteen patients with CH underwent condylar growth assessment using clinical and radiographic examinations. Seven patients with suspected active condyles underwent single photo emission computed tomography (SPECT) examination. A total of patients with asymmetry and malocclusion were treated with orthognathic surgery. Three patients with intact occlusion; underwent inferior border osteotomy with nerve repositioning. All patients were followed up for 3 years without any complications. There is great diversity in the clinical and radiographic presentation in cases with CH. Assessment of condylar growth activity is the cornerstone in managing these cases. After that each case has its own diverse treatment plan to achieve a satisfactory facial symmetry.
    Annals of maxillofacial surgery. 01/2012; 2(1):17-23.
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    ABSTRACT: Hemimandibular hyperplasia (HH) is a developmental asymmetry characterized by three-dimensional enlargement of one half of the mandible. The hyperplastic side usually involves the condyle, condylar neck, ramus, and body, with the anomaly terminating abruptly at the symphysis. The malformation results in the clinical presentation of ipsilateral enlargement of the mandible and tilted occlusal plane, associated with a deviated chin to the contralateral side. Since the first case report of HH in the English literature in 1836, various terminology and classifications were used. In this study, the authors classified the patients into typical and atypical types of HH on the basis of clinical and radiologic observations in an effort to achieve a simplified and efficient surgical management on the basis of the severity of deformity. Accordingly, surgical treatments are designed respectively on the basis of the authors' classification and treatment algorithm. In addition, in view of potential complications arising from condylectomy, none of the patients had undergone condylectomy as part of the surgical treatment. 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 Journal of craniofacial surgery 01/2014; · 0.81 Impact Factor