The CBCT-based DBM analysis can be used clinically to assess alveolar bone quality changes induced by orthodontic treatment to improve treatment planning and result evaluation.

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Aim:Aim: Aim: Aim: The aim of this study was to evaluate and compare the treatment effects and duration of en-masse retraction combined with labial corticotomy and that with palatal corticotomy using miniscrews as source of anchorage. Methods:Methods: Methods: Methods: Twenty adult patients with bimaxillary or maxillary protrusion requiring orthodontic treatment with upper anterior retraction in the extraction space of first premolars were selected. Patients were divided into two groups; labial corticotomy gruop and palatal corticotomy group, each group consisted of 10 subjects. The retraction time was estimated. Cephalometric radiographs were taken before treatment (T1) and after treatment (T2). Results: Results: Results: Results: There was no significant difference in retraction time between labial and palatal corticotomy groups. Radiographic evaluation showed significant maxillary incisor retraction. Conclusion: Conclusion: Conclusion: Conclusion: The use of corticotomy technique from labial side only could be beneficial for adult patients with difficult surgical access from the palatal side.

The purpose of this study was to investigate the effect of three different ligation designs of self-ligating orthodontic bracket systems (SLBs) on friction, under wet and dry conditions. Universal testing machine was used to slide forty brackets of four different bracket types (twenty passive self-ligating brackets PSLBs, ten active self-ligating brackets ASLB, and ten preadjusted brackets with conventional elastomeric O-ties) along 0.019×0.025 stainless steel (SS) wire segments at crosshead speed 8mm/min. Testing was done under dry and wet conditions. Statistical analysis of collected data revealed that all three tested SLB types displayed significantly lower frictional forces (FF) than conventional brackets with conventional elastomeric O-ties (CEL) under both dry and wet conditions. Both tested PSLB types displayed significantly lower frictional forces than tested ASLB type, under both dry and wet conditions.