Document Detail

Pain intensity during the first 7 days following the application of light and heavy continuous forces.
MedLine Citation:
PMID:  19088059     Owner:  NLM     Status:  MEDLINE    
The purpose of the present study was to determine whether a force of 20 cN can be biologically active for tooth movement and to examine the pain intensity during the application of light (20 cN) or heavy (200 cN) continuous forces for 7 days. In the first experiment, a force of 20 cN was applied to eight canines in five volunteers. The mean tooth movement during 10 weeks was 2.4 mm. In the second experiment, two forces of 20 or 200 cN were applied to maxillary premolars in 12 male subjects (aged 24-31 years) to measure pain intensity for 7 days. Spontaneous and biting pain were recorded every 2-4 hours on a 100 mm visual analogue scale (VAS). Wilcoxon signed-rank test was used for statistical analysis. Comparing the VAS score at force initiation with the other time points, there was no significant difference in spontaneous pain for either group, or in biting pain for the light-force group. However, biting pain in the heavy-force group during the time period from 6 to 156 hours was significantly (P < 0.05) greater than that at force initiation. Comparing the VAS scores between the light- and heavy-force group, VAS scores for biting pain in the heavy-force group during the time period from 8 to 100 hours was significantly (P < 0.05) greater than that in the light-force group. A force of 20 cN can move teeth, but pain intensity while biting may be greater approximately 8 hours to 5 days following the application of heavy continuous force compared with light force.
Mikinori Ogura; Hiroki Kamimura; Abdullah Al-Kalaly; Kunihiro Nagayama; Koji Taira; Junko Nagata; Shouichi Miyawaki
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-12-15
Journal Detail:
Title:  European journal of orthodontics     Volume:  31     ISSN:  1460-2210     ISO Abbreviation:  Eur J Orthod     Publication Date:  2009 Jun 
Date Detail:
Created Date:  2009-05-21     Completed Date:  2009-08-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7909010     Medline TA:  Eur J Orthod     Country:  England    
Other Details:
Languages:  eng     Pagination:  314-9     Citation Subset:  D; IM    
Division of Orthodontics, Maxillofacial Unit, Oita Oka Hospital, Japan.
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MeSH Terms
Bicuspid / pathology
Bite Force
Chromium Alloys
Cuspid / pathology
Dental Alloys
Orthodontic Brackets
Orthodontic Wires
Pain / physiopathology*
Pain Measurement*
Stress, Mechanical
Time Factors
Tooth Movement*
Young Adult
Reg. No./Substance:
0/Chromium Alloys; 0/Dental Alloys; 12035-60-8/titanium nickelide; 7440-02-0/Nickel; 7440-32-6/Titanium

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

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