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Controlled space closure with a statically determinate retraction system

Authors
 Kwangchul Choy  ;  Eung-Kwon Pae  ;  Kyung-Ho Kim  ;  Young Chel Park  ;  Charles J. Burstone 
Citation
 ANGLE ORTHODONTIST, Vol.72(3) : 191-198, 2002 
Journal Title
 ANGLE ORTHODONTIST 
ISSN
 0003-3219 
Issue Date
2002
MeSH
Adult ; Dental Stress Analysis* ; Female ; Humans ; Orthodontic Appliance Design ; Orthodontic Appliances* ; Orthodontic Space Closure/instrumentation* ; Torque ; Vertical Dimension
Abstract
We designed a variant of a cantilever spring, the statically determinate retraction system, and studied its mechanical characteristics. This novel system consisted of a single-force cantilever arm made of 0.017 x 0.025-inch titanium molybdenum alloy wire for active retraction and a passive rigid stabilizing unit. Since the active component for space closure is a cantilever, it is simple to measure the force system of the spring with a force gauge (ie, the system is a statically determinate system). A torque tester apparatus was used to examine the property of this retraction spring with a helix at the posterior and a simple bend at the anterior. Both a standard shape and modified shapes of the spring were studied. At full activation, the standard spring delivered 163 g with a load-deflection rate of six g/mm. When the magnitude of the anterior bend of the spring was increased, the horizontal component of the force increased more than the vertical component. In contrast, when the posterior bend of the spring increased, the vertical component of the force increased more than the horizontal component. A clinical case presented here clearly demonstrates the versatility and applicability of the spring.
Full Text
http://www.angle.org/doi/10.1043/0003-3219(2002)072%3C0191:CSCWAS%3E2.0.CO;2
DOI
10.1043/0003-3219(2002)072<0191:CSCWAS>2.0.CO;2
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Kyung Ho(김경호) ORCID logo https://orcid.org/0000-0002-8154-2041
Park, Young Chel(박영철)
Choy, Kwang Chul(최광철)
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/166941
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