Skeletal changes associated with extraoral appliance use in the correction of Class II malocclusions
Date
1974
DOI
Authors
Livingston, David
Version
OA Version
Citation
Abstract
This study was undertaken to evaluate the skeletal changes seen in high and low angle patients treated with high and cervical traction extraoral appliances used in the correction of Class II malocclusion.
Twenty-six patients aged ten to sixteen years old were selected for this study. They were divided into four groups: 1) patients with high GoGn to SN angles who used cervical traction gears, 2) patients with high GoGn to SN angles who used high pull headgears, 3) patients with low GoGn to SN angles who used high pull headgears, and 4) patients with low GoGn to SN angles who used cervical traction gears.
A comparison of the skeletal changes seen during treatment was made through the differences seen in the angular measurements taken from standard lateral cephalograms. These measurements included SNA, SNB, ANB, SND, Occl to SN, and GoGn to SN.
The results indicated several statistically significant changes seen in the angular measurements when related to patient mandibular plane angle and type of appliance used (high pull or cervical pull).
It appeared that high angle patients were more inclined to demonstrate a clockwise mandibular rotation and low angle patients a clockwise mandibular rotation regardless of the type of extraoral appliance used.
Description
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.
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.