Rate of orthodontic tooth movement after changing the force magnitude: an experimental study in beagle dogs.

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Publication year
2010Source
Orthodontics and Craniofacial Research, 13, 4, (2010), pp. 238-45ISSN
Annotation
01 november 2010
Publication type
Article / Letter to editor

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Organization
Orthodontics and Oral Biology
Dentistry
Journal title
Orthodontics and Craniofacial Research
Volume
vol. 13
Issue
iss. 4
Page start
p. 238
Page end
p. 45
Subject
NCMLS 3: Tissue engineering and pathology; NCMLS 5: Membrane transport and intracellular motilityAbstract
OBJECTIVES: To study a possible dose-response relation between force magnitude and rate of orthodontic tooth movement by altering forces during bodily orthodontic tooth movement. SETTING AND SAMPLE POPULATION: Eight young adult beagle dogs were used. The experiments were carried out in the Central Animal Facility, and all analyses were conducted in the Department of Orthodontics and Oral Biology, Radboud University Nijmegen Medical Centre. MATERIALS AND METHODS: Orthodontic appliances were placed exerting a reciprocal force on the mandibular second premolars and first molars. A force of 10 or 300 cN was randomly assigned to each side of the dogs. After 22 weeks, all forces were changed to 600 cN. Based on intra-oral measurements, tooth movement rates were calculated. RESULTS: The premolars showed no difference in the rates of tooth movement with 10 or 300 cN. Replacing 10 for 600 cN increased the rate, but replacing 300 for 600 cN did not. Molars moved faster with 300 than with 10 cN, and changing both forces to 600 cN increased the rate of tooth movement. Data from all teeth were pooled considering their relative root surfaces, and a logarithmic relation was found between force and rate of tooth movement. CONCLUSIONS: Only in the very low force range, a positive dose-response relation exists, while in higher force ranges, no such relation could be established.
This item appears in the following Collection(s)
- Academic publications [203793]
- Electronic publications [102109]
- Faculty of Medical Sciences [80320]
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