Skeletal and dental changes when rapid maxillary expansion is accompanied by a modified Le Fort I osteotomy coupled with midpalatal osteotomy
Date
1983
DOI
Authors
Garcia-Arocha, Myriam Schemel de
Version
OA Version
Citation
Abstract
Adult patients who present transverse maxillary deficiencies are usually treated by rapid maxillary expansion combined with surgical procedures.
In this study six adult male cats were used to evaluate the skeletal and dental changes that occur when rapid maxillary expansion was assisted by the following surgical procedures: a) modified Le Fort I osteotomies coupled with midpalatal osteotomies; b) midpalatal osteotomies.
Metallic implants were placed in the maxilla near the maxillary-frontal and zygomatico-maxillary sutures, before the surgical procedures were performed. Then an antero-posterior cephalometric X-ray was taken. Immediately after the surgical procedures, an expansion appliance was cemented and expanded 4.5 mm in a period of a week. The appliances were left in six weeks and then a second antero-posterior cephalometric X-ray was taken and impressions for dental casts. On this basis, it was found that expansion of the dental arch had taken place and was 0.4 rm greater in the group subjected to the combined surgical procedures. Slight tipping of the maxillary segments in the frontal plane was found, 0.5[degrees] greater in the single procedure group.
Basal skeletal expansion was found to be similar in both groups. The more complex surgery in which more lines of stress are cut did not result in increased basal expansion.
Selected sutures were studied and no increased cellular activity was found, suggesting that the forces produced by the above mentioned procedures have not produced an effect on these suture sites.
Description
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Colored photographs included.
Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry, 1983 (Orthodontics)
Bibliography: leaves 81-90.
Colored photographs included.
Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry, 1983 (Orthodontics)
Bibliography: leaves 81-90.
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.