Document Detail

Three-year follow-up of bimaxillary surgery to correct skeletal Class III malocclusion: stability and risk factors for relapse.
MedLine Citation:
PMID:  21195281     Owner:  NLM     Status:  MEDLINE    
INTRODUCTION: The purpose of this study was to evaluate long-term skeletal and occlusal stability after bimaxillary surgery to correct skeletal Class III malocclusion.
METHODS: The sample comprised 81 consecutively treated patients. All subjects had received a combined 1-piece LeFort I and bilateral sagittal split ostotomies with rigid fixation between 1990 and 2003 and were followed for 3 years. Lateral cephalograms were obtained before surgery and at 5 occasions after surgery.
RESULTS: The mean setback was 6.9 mm in the mandible, and the maxilla was moved forward 3.7 mm. In most patients, the posterior maxilla was impacted. Relapse of maxillary advancement was insignificant (0.1 mm), whereas relapse at B-point was on average 1.7 mm (P <0.010). After 3 years, mean overjet and overbite amounts were 2.0 and 1.9 mm, respectively. Skeletal relapse of the mandible increased significantly with the surgical setback (P <0.001) and the change in the vertical position of the posterior maxilla (P = 0.010) (multivariate regression analysis).
CONCLUSIONS: Bimaxillary surgery resulted in good occlusal stability. Maxillary advancement was stable, whereas relapse of the mandibular setback varied. Risk factors for horizontal relapse of the mandible were large setback and inferior repositioning of the posterior maxilla.
Gundega Jakobsone; Arild Stenvik; Leiv Sandvik; Lisen Espeland
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:  139     ISSN:  1097-6752     ISO Abbreviation:  Am J Orthod Dentofacial Orthop     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2011-01-03     Completed Date:  2011-02-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8610224     Medline TA:  Am J Orthod Dentofacial Orthop     Country:  United States    
Other Details:
Languages:  eng     Pagination:  80-9     Citation Subset:  D; IM    
Copyright Information:
Copyright © 2011 American Association of Orthodontists. Published by Mosby, Inc. All rights reserved.
Department of Orthodontics, Riga Stradins University, Riga, Latvia.
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MeSH Terms
Age Factors
Bone Screws
Cephalometry / methods
Dental Occlusion
Follow-Up Studies
Jaw Fixation Techniques
Malocclusion, Angle Class III / surgery*
Mandible / pathology,  surgery*
Maxilla / pathology,  surgery*
Middle Aged
Nasal Bone / pathology
Orthodontics, Corrective / instrumentation
Osteotomy / methods
Osteotomy, Le Fort / methods
Risk Factors
Sella Turcica / pathology
Sex Factors
Treatment Outcome
Vertical Dimension
Young Adult

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

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