Movement of the maxillary dentition during rapid palatal expansion and post-activation retention

PLEASE NOTE: This work is protected by copyright. Downloading is restricted to the BU community: please click Download and log in with a valid BU account to access. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.Thesis (M.Sc.D.)--Boston University School of Graduate Dentistry, 1974. Orthodontics.Bibliography included.Rapid expansion of the midpalatal suture is perfonned as an orthopedic procedure to correct basal defficiencies reflected as dental crossbites. Historically, this procedure was used by rhinologists and orthodontists in the late 19th century; however, if fell into disuse after some investigators proposed a functional concept which believed that by moving teeth orthodontically the change in function stimulated growth of the maxilla and nasal cav1ty. Tlhe last generation has brought renewed utilization of rapid palatal expansion therapy due in part to investigations that show sutural separation can be achieved. The purpose of this investigation was to analyze the dental response to rapid palatal expansion. Twenty-one patients were selected. With no regard as to sex or ages they were divided into two groups, one wearing a split acrylic and one wearing an hygienic expansion appliance. Records eonsisted of stone models representing 3 stages of expansion therapy: one inunediately precedes insertion and activation of the appliance, one imnediately after deactivation and stabilization of the appliance and one after 3 100nths of fixed retention. Markings were made on the teeth from which various measurements were made: ... [TRUNCATED