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Lateral Cephalometic Assessment in Patients with Condylar Resorption  

Hur, Yun-Kyung (Department of Oral medicine, School of Dentistry Kyungpook National University)
Park, Hyo-Sang (Department of Orthodontics, School of Dentistry Kyungpook National University)
Choi, Jae-Kap (Department of Oral medicine, School of Dentistry Kyungpook National University)
Publication Information
Journal of Oral Medicine and Pain / v.31, no.4, 2006 , pp. 337-346 More about this Journal
Abstract
Aims: The present study investigated the relationship between condylar resorption and craniofacial skeleton types(especially vertical relationships), the differences of craniofacial skeleton types between with open bite group and without open bite group, and the associations of anterior disc dislocation with or without reduction to condylar resorption with MRI. Patients selection and methods: Clinical examination, magnetic resonance imaging (MRI), panorama, lateral transcranial and lateral cephalometric radiographs in 34 patients with condylar resorption were used to investigate this relationship. Results and Conclusions: Patients with the following specific facial morphologic characteristics appear to be most susceptible to condylar resorption: (1) females were predominant, (2) patients' age ranged from 12 to 50 years old with a strong predominance for 2nd and 3rd decades, (3) patients had high mandibular plane angle and high gonial angle, (4) patients had decreased vertical height of the ramus, (5) patients had generally significant antegonial notch, (6) patients had predominance of Class I occlusal relationship with or without open bite but mandible was retruded as mean ANB 5.54 degrees, (7) condylar resorption rarely occurs in lower mandibular plane angle facial types, (8) although no statistically significant difference was found, the open bite group had a tendency more hyperdivergent skeletal pattern than the non open bite group, and (9) imaging demonstrates from small resorbing condyles to idiopathic condylar resorption and TMJ articular disc dislocations. Thus, morphologic features of patients with vertical discrepancies may represent a risk factor for the development of condylar resorption.
Keywords
Condylar resorption; Open bite; Disc dislocation; Vertical discrepancy;
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