Low skeletal bone mineral density as a potential aetiologica
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This study aimed to investigate the contributing factor of impaired skeletal quality in the pathogenesis of idiopathic condylar resorption. One hundred and twenty-six patients with MRI-confirmed ICR and 596 patients with disc displacement without a diminished condyle, of both sexes, were included.

Dental examinations and retrospective surveys regarding temporomandibular joint symptoms and progression of maxillofacial deformities were conducted. Skeletal bone mineral density was measured by dual-energy X-ray absorptiometry (DXA) and converted to T-scores and Z-scores. Results showed that idiopathic condylar resorption patients had a smaller overbite, larger overjet, a larger range of mouth opening, and higher rates of anterior open bite and mandibular retrusion compared to disc displacement patients. idiopathic condylar resorption was associated with an increased probability of low skeletal bone mineral density at chronological age in females but not in males. This study indicates that reduced bone mineral density may predispose females to an exacerbated condylar resorption process in addition to increased joint loading initiated from disc displacement.

Source:https://www.ijoms.com/article/S0901-5027(20)30410-0/fulltext?rss=yes
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