Thesis (M.Sc.) - Cairo University -Faculty of Oral and Dental Medicine - Department of Orthodontics

Orthodontic treatment usually requires approximately eighteen to twenty-four months from the beginningtill it is fully finished. This maximizes the risk of caries, periodontaldisease and root resorption. Different methods have been previously tested to induce the regional acceleratory phenomena (RAP) to shorten the orthodontic treatment time. Most of these attempts were limited due to their invasive nature or side effects. In this randomized controlled clinical trialthe sample consisted of 30 female patients aging between 14-25 years who were classified into two groups: a study group received corticision surgical procedure and a control group received routine orthodontic treatment. The corticision was performed on the labial surface of the mandibular anterior teeth. Both groups were followed up until complete alignment of the lower anterior teeth using dental models taken every two weeks appointment. Measurements on the lower models were done using Little{u2019}s irregularity index in both groups to assess the rate of alignment. The aim of this study was: To investigate the effects of corticision on orthodontic tooth movement. The results showed significant increase in the rate of alignment in the corticision assisted group compared to the control group following corticision procedure. Moreover, significant decrease of the overall mean treatment time in the study group versus the control group was reported. From the results of the current study the following conclusions could be drawn: Corticision could be considered as a helpful minor surgical procedure that could be used to accelerate the rate of alignment in cases with lower anterior crowding. Corticision surgical procedure could reduce the treatment time needed for alignment of the lower anterior teeth by about 50%. Corticision procedure could be considered as a minimally invasion surgical intervention as revealed from the increased percentage of patients acceptance (86.7%)

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