Document Detail

Three-dimensional assessment of mandibular and glenoid fossa changes after bone-anchored Class III intermaxillary traction.
MedLine Citation:
PMID:  22748987     Owner:  NLM     Status:  MEDLINE    
INTRODUCTION: Conventional treatment for young Class III patients involves extraoral devices designed to either protract the maxilla or restrain mandibular growth. The use of skeletal anchorage offers a promising alternative to obtain orthopedic results with fewer dental compensations. Our aim was to evaluate 3-dimensional changes in the mandibles and the glenoid fossae of Class III patients treated with bone-anchored maxillary protraction.
METHODS: Twenty-five consecutive skeletal Class III patients between the ages of 9 and 13 years (mean age, 11.10 ± 1.1 year) were treated with Class III intermaxillary elastics and bilateral miniplates (2 in the infrazygomatic crests of the maxilla and 2 in the anterior mandible). The patients had cone-beam computed tomography images taken before initial loading and at the end of active treatment. Three-dimensional models were generated from these images, registered on the anterior cranial base, and analyzed by using color maps.
RESULTS: Posterior displacement of the mandible at the end of treatment was observed in all subjects (posterior ramus: mean, 2.74 ± 1.36 mm; condyles: mean, 2.07 ± 1.16 mm; chin: mean, -0.13 ± 2.89 mm). Remodeling of the glenoid fossa at the anterior eminence (mean, 1.38 ± 1.03 mm) and bone resorption at the posterior wall (mean, -1.34 ± 0.6 mm) were observed in most patients.
CONCLUSIONS: This new treatment approach offers a promising alternative to restrain mandibular growth for Class III patients with a component of mandibular prognathism or to compensate for maxillary deficiency in patients with hypoplasia of the midface. Future studies with long-term follow-up and comparisons with facemask and chincup therapies are needed to better understand the treatment effects.
Hugo De Clerck; Tung Nguyen; Leonardo Koerich de Paula; Lucia Cevidanes
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics     Volume:  142     ISSN:  1097-6752     ISO Abbreviation:  Am J Orthod Dentofacial Orthop     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-07-03     Completed Date:  2012-09-25     Revised Date:  2013-07-12    
Medline Journal Info:
Nlm Unique ID:  8610224     Medline TA:  Am J Orthod Dentofacial Orthop     Country:  United States    
Other Details:
Languages:  eng     Pagination:  25-31     Citation Subset:  D; IM    
Copyright Information:
Copyright © 2012 American Association of Orthodontists. Published by Mosby, Inc. All rights reserved.
Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill, NC, USA.
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MeSH Terms
Bone Plates
Bone Remodeling / physiology
Bone Resorption / pathology
Cephalometry / methods*
Chin / pathology
Cone-Beam Computed Tomography / methods
Image Processing, Computer-Assisted / methods
Imaging, Three-Dimensional / methods*
Malocclusion, Angle Class III / therapy*
Mandible / pathology*
Mandibular Condyle / pathology
Maxilla / pathology
Orthodontic Anchorage Procedures / instrumentation,  methods*
Orthodontic Appliances
Prospective Studies
Temporal Bone / pathology*
Traction / instrumentation
User-Computer Interface
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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