Skeletal relapse associated with maxillary expansion during the fixed retention period: a comparative study of the hygenic and acrylic rapid palatal expansion appliance
Date
1974
DOI
Authors
Osofsky, Richard C.
Version
OA Version
Citation
Abstract
The purpose of this study was to evaluate the role of the rapid palatal expansion appliance in preventing skeletal relapse during a two month fixed retention period. Twenty three subjects were involved in this project. Measurements to determine skeletal changes were taken from four boney landmarks and two implant reference points within the craniofacial complex. A-P headplates were taken before appliance activation, the day of deactivation,and two months post fixed retention.
A comparison of the acrylic and hygenic rapid palatal expansion appliance revealed no significant differences between the two in preventing skeletal relapse during two months fixed retention. The lateral nasal wall appeared to relapse independently of, and to a greater degree than, the maxilla during this fixed retention period regardless of the type of maxillary expansion appliance used. In addition, multiple maxillary expansion appliances appeared to result in a significant relapse of the nasal passages while the remainder of the craniofacial complex was unaffected. Metallic implants indicate a post deactivation expansion phenomenon of the alveolar bone and the maxilla, however measurements from boney landmarks contradict this finding.
Description
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Thesis (M.Sc.D.)--Boston University School of Graduate Dentistry, 1974. Orthodontics.
Bibliography included.
Thesis (M.Sc.D.)--Boston University School of Graduate Dentistry, 1974. Orthodontics.
Bibliography included.
License
This work is protected by copyright. Downloading is restricted to the BU community. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.