Journal article
Friction does not increase anchorage loading
American journal of orthodontics and dentofacial orthopedics, Vol.131(3), pp.412-414
2007
DOI: 10.1016/j.ajodo.2006.09.037
PMID: 17346599
Abstract
Conventional wisdom suggests that orthodontists must apply added force to overcome friction during canine retraction (sliding mechanics), the result of which can be increased anchorage loading and anchorage loss. However, for a frictional force to be exerted mesially by the archwire against a canine during retraction, the archwire must be compressed between the canine and the anchor molar, and an equal but opposite force must be applied distally against the molar by the archwire. In other words, the frictional force that reduces the force of retraction on the canine must also reduce the protraction force on the molar. Emphasis on employing reduced-friction (eg, self-ligating) brackets during sliding mechanics to prevent added posterior anchorage loading is unwarranted and based more on bracket salesmanship than on orthodontic biomechanics.
Details
- Title: Subtitle
- Friction does not increase anchorage loading
- Creators
- Thomas E Southard - Professor and head, Department of Orthodontics, University of Iowa, Iowa City, IowaSteve D Marshall - Adjunct associate professor, Department of Orthodontics, University of Iowa, Iowa City, IowaNicole M Grosland - Assistant professor, Department of Biomedical Engineering, University of Iowa, Iowa City, Iowa
- Resource Type
- Journal article
- Publication Details
- American journal of orthodontics and dentofacial orthopedics, Vol.131(3), pp.412-414
- DOI
- 10.1016/j.ajodo.2006.09.037
- PMID
- 17346599
- NLM abbreviation
- Am J Orthod Dentofacial Orthop
- ISSN
- 0889-5406
- eISSN
- 1097-6752
- Publisher
- Mosby, Inc
- Language
- English
- Date published
- 2007
- Academic Unit
- Roy J. Carver Department of Biomedical Engineering; Orthodontics; Orthopedics and Rehabilitation; Injury Prevention Research Center
- Record Identifier
- 9984040551302771
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