Thesis (Ph.D.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Orthodontics

This study was carried out to investigate using cone beam computed tomography (CBCT) imaging, the position, inclination and surface area of the TMJ components in a sample of different skeletal malocclusions and whether different premolars extraction protocols have any effect on the geometry of the TMJ thus can predispose to TMD. A sample of 71 individuals (56 patients and 15 volunteers) participated in the present study. The total sample was divided into three groups based on specific criteria: Group I: Skeletal Class I comprised 15 volunteers (30 joints). Group II: Skeletal Class II comprised 30 patients (60 joints) indicated for orthodontic camouflage and divided into three equal subgroups; two, three and four premolars extraction. Group III: Skeletal class III comprised 15 patients (30 joints). Group IV: Skeletal long face comprised 15 patients (30 joints). Group V: Skeletal short face comprised 15 patients (30 joints). Both clinical examination and CBCT analysis of the temporomandibular joints with the next generation I - CAT was performed once for the first and third groups and twice for the second group (pre - treatment and post-retraction). Statistical analysis was performed on the gathered data and results were withdrawn

Issued also as CD