Effects of prestretching on force degradation of synthetic elastomeric chains

Kyung Ho Kim, Chun Hsi Chung, Kwnagchul Choy, Jeong Sub Lee, Robert L. Vanarsdall

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


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°C distilled water. The prestretched and unprestretched (control) modules were then stretched to 30 mm in 37°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.

Original languageEnglish
Pages (from-to)477-482
Number of pages6
JournalAmerican Journal of Orthodontics and Dentofacial Orthopedics
Issue number4
Publication statusPublished - 2005 Oct

All Science Journal Classification (ASJC) codes

  • Orthodontics


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