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Effects of prestretching on force degradation of synthetic elastomeric chains

Authors
 Kyung-Ho Kim  ;  Chun-Hsi Chung  ;  Kwnagchul Choy  ;  Jeong-Sub Lee  ;  Robert L. Vanarsdall 
Citation
 AMERICAN JOURNAL OF ORTHODONTICS AND DENTOFACIAL ORTHOPEDICS, Vol.128(4) : 477-482, 2005 
Journal Title
AMERICAN JOURNAL OF ORTHODONTICS AND DENTOFACIAL ORTHOPEDICS
ISSN
 0889-5406 
Issue Date
2005
MeSH
Dental Stress Analysis/methods* ; Elasticity ; Elastomers* ; Materials Testing ; Orthodontic Appliances* ; Plastics ; Stress, Mechanical ; Tensile Strength ; Tooth Movement Techniques/instrumentation*
Keywords
16214630
Abstract
INTRODUCTION: The purpose of this study was to evaluate the effects of prestretching on time-dependant force decay of synthetic elastomeric chains.
METHODS: Five-unit (12.5 mm) and 6-unit (15.5 mm) modules (Generation II, Ormco, Glendora, Calif) were prestretched 100% for 1 hour (n = 12), 24 hours (n = 12), 2 weeks (n = 12), and 4 weeks (n = 12) in 37 degrees C distilled water. The prestretched and unprestretched (control) modules were then stretched to 30 mm in 37 degrees C water, and their forces were measured at 0 hour, 1 hour, 24 hours, and weekly for 4 weeks with a digital force gauge.
RESULTS: The prestretched 5- and 6-unit modules yielded significantly lower initial force than the controls. All 5- and 6-unit prestretched and control groups showed substantial force decay during the first hour. However, at 1 hour, similar remaining forces were found in the 5-unit prestretched and control groups (P > .05), and small differences were seen in the 6-unit groups. The rates and patterns of force decay from 1 hour to 4 weeks were quite similar between the control and the prestretched modules of both the 5- and 6-unit groups.
CONCLUSIONS: The effects of prestretching on force decay of elastomeric chains were noted mainly in the first hour. Thus, the clinical value of prestretching a synthetic elastomeric chain is questionable.
Full Text
http://www.sciencedirect.com/science/article/pii/S0889540605003628
DOI
10.1016/j.ajodo.2004.04.027
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
Choy, Kwang Chul(최광철)
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/151533
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