Document Detail

Relationship between initial crowding and interproximal force during retention phase.
MedLine Citation:
PMID:  20587942     Owner:  NLM     Status:  MEDLINE    
This study investigated the change in interproximal force (IPF) in mandibular anterior teeth during retention and the relationship between the irregularity index before orthodontic treatment and the IPF. The effect that an erupting third molar had on IPF was also examined. Forty treated patients (40 with extraction of four bicuspids) were followed for 18 months during the retention phase. The irregularity index was determined from initial plaster casts. The total IPF was determined by measuring the interdental frictional forces at the mandibular anterior teeth by withdrawing a metal strip. The total IPF increased during the retention phase until 18 months, and there was a positive correlation between the irregularity index and total IPF 6 to 18 months after active treatment. An erupting third molar did not affect the total IPF. An increase in the total IPF may be an indication of relapse in mandibular anterior crowding. In conclusion, orthodontists should pay special attention to potential relapse in the lower anterior teeth 6 months after active treatment in cases with severe anterior crowding before treatment.
Kumiko Okazaki
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of oral science     Volume:  52     ISSN:  1880-4926     ISO Abbreviation:  J Oral Sci     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-06-30     Completed Date:  2010-09-30     Revised Date:  2011-11-03    
Medline Journal Info:
Nlm Unique ID:  9808942     Medline TA:  J Oral Sci     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  197-201     Citation Subset:  D; IM    
Division of Applied Oral Sciences, Nihon University Graduate School of Dentistry, Tokyo, Japan.
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MeSH Terms
Bicuspid / surgery
Cuspid / physiopathology
Dental Models
Follow-Up Studies
Incisor / physiopathology
Malocclusion / classification,  physiopathology*,  therapy
Molar / physiopathology
Molar, Third / physiopathology
Orthodontic Retainers*
Orthodontics, Corrective*
Serial Extraction
Stress, Mechanical
Tooth Eruption / physiology
Young Adult

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