Document Detail

Experimental determination of optimal force system required for control of anterior tooth movement in sliding mechanics.
MedLine Citation:
PMID:  19121498     Owner:  NLM     Status:  MEDLINE    
INTRODUCTION: This study was designed to determine the optimum vertical height of the retraction force on the power arm that is required for efficient anterior tooth retraction during space closure with sliding mechanics. METHODS: Three adults (1 man, 2 women) with Angle Class II Division 1 malocclusions were selected for this study. In each subject, the maxillary right central incisor was the target tooth. Initial tooth displacements of that tooth with sliding mechanics with various heights of retraction forces were measured in vivo by a 2-point 3-dimensional displacement magnetic sensor device. The tooth's motion trajectories on the midsagittal plane were studied. RESULTS: The location of the center of rotation of the target tooth varied according to the different heights of the retraction forces. Controlled anterior tooth movement (ie, lingual-crown tipping, lingual-root movement) can be predicted, simulated, or even manipulated by different heights of retraction forces on the power arm in the sliding mechanics force system. A power arm length of 3 to 5 mm is estimated to produce controlled lingual-crown tipping (with the apex as the center of rotation) for efficient anterior tooth retraction during sliding space closure in adults with Angle Class II Division 1 malocclusion. CONCLUSIONS: Knowing and applying the correct height of retraction force on the power arm is the key to efficient anterior tooth retraction.
SheauSoon Sia; Tatsunori Shibazaki; Yoshiyuki Koga; Noriaki Yoshida
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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:  135     ISSN:  1097-6752     ISO Abbreviation:  Am J Orthod Dentofacial Orthop     Publication Date:  2009 Jan 
Date Detail:
Created Date:  2009-01-05     Completed Date:  2009-01-30     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8610224     Medline TA:  Am J Orthod Dentofacial Orthop     Country:  United States    
Other Details:
Languages:  eng     Pagination:  36-41     Citation Subset:  D; IM    
Sia Orthodontic Dental Specialist Clinic, No. 5-1, Jalan Metro Perdana Barat 1, Taman Usahawan Kepong, 52100 Kuala Lumpur, Malaysia.
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MeSH Terms
Chromium Alloys
Imaging, Three-Dimensional
Incisor / pathology*
Magnetics / instrumentation
Malocclusion, Angle Class II / therapy
Maxilla / pathology
Orthodontic Anchorage Procedures / instrumentation
Orthodontic Appliances*
Orthodontic Space Closure / instrumentation,  methods*
Orthodontic Wires
Stress, Mechanical
Tooth Crown / pathology
Tooth Movement / instrumentation,  methods*
Tooth Root / pathology
Reg. No./Substance:
0/Chromium Alloys

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

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