Document Detail

Effect of titrated mandibular advancement and jaw opening on the upper airway in nonapneic men: a magnetic resonance imaging and cephalometric study.
MedLine Citation:
PMID:  14765057     Owner:  NLM     Status:  MEDLINE    
The aim of this study was to examine adaptive changes in the cross-sectional area of the upper airway during mandibular advancement and jaw opening and to explore whether these changes are directly related to morphologic features of the mandible. Fourteen nonapneic men participated in this study. A custom-made oral device was used to keep the mandible at 0% (F(0)V(0)), 50% (F(50)V(0)), 75% (F(75)V(0)), or 100% (F(100)V(0)) of maximum advancement, and at 50% (F(75)V(50)), 75% (F(75)V(75)), or 100% (F(75)V(100)) of maximum gape at F(75)V(0). Magnetic resonance imaging was used to investigate differences in the upper-airway cross-sectional area in these 7 positions. To eliminate excessive individual variation, changes in the mean (mean%) and minimum (min%) cross-sectional area of the upper airway were calculated as percentages of those at F(0)V(0). Cephalograms were taken to analyze morphologic features of the mandible. A dose-dependent change was seen when the mandible was advanced. The min% in F(100)V(0) was significantly greater than those in F(50)V(0) and F(75)V(0). The change in the upper airway size varied between subjects during jaw opening. At F(75)V(0), the min% of the whole upper airway was significantly associated with morphologic features of the mandible, such as the mandibular plane angle and lengths of the mandibular body and ramus.
Xuemei Gao; Ryo Otsuka; Takashi Ono; Ei-ichi Honda; Takehito Sasaki; Takayuki Kuroda
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
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:  125     ISSN:  0889-5406     ISO Abbreviation:  Am J Orthod Dentofacial Orthop     Publication Date:  2004 Feb 
Date Detail:
Created Date:  2004-02-06     Completed Date:  2004-03-18     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8610224     Medline TA:  Am J Orthod Dentofacial Orthop     Country:  United States    
Other Details:
Languages:  eng     Pagination:  191-9     Citation Subset:  D; IM    
Department of Orthodontics, School of Stomatology, Peking University, Beijing, China.
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MeSH Terms
Adaptation, Physiological
Centric Relation
Hypopharynx / anatomy & histology
Image Processing, Computer-Assisted
Magnetic Resonance Imaging*
Mandible / physiology*
Mandibular Advancement / instrumentation,  methods*
Mouth / anatomy & histology*
Oropharynx / anatomy & histology
Orthodontic Appliance Design
Palate, Soft / anatomy & histology
Pharynx / anatomy & histology*
Pulmonary Ventilation / physiology

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

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