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Effects of prestretch on stress relaxation and permanent deformation of orthodontic synthetic elastomeric chains

Authors
 Jee Hae Chang  ;  Chung-Ju Hwang  ;  Kyung-Ho Kim  ;  Jung-Yul Cha  ;  Kwang-Mahn Kim  ;  Hyung Seog Yu 
Citation
 Korean Journal of Orthodontics (대한치과교정학회지), Vol.48(6) : 384-394, 2018 
Journal Title
 Korean Journal of Orthodontics (대한치과교정학회지) 
ISSN
 1225-5610 
Issue Date
2018
Keywords
Orthodontic synthetic elastomeric chain ; Prestretch ; Stress relaxation ; Permanent deformation
Abstract
Objective: This study was performed to investigate an appropriate degree of prestretch for orthodontic synthetic elastomeric chains focusing on timedependent viscoelastic properties. Methods: Orthodontic synthetic elastomeric chains of two brands were prestretched to 50, 100, 150, and 200% of the original length in one and three cycles, and the hysteresis areas of the obtained stress-strain curves were determined. Acrylic plates were employed to maintain constant strain during the experiment. A total of 180 samples were classified into nine groups according to brand, and their stresses and permanent deformations were measured immediately after prestretch (0 hour), after 1 hour and 24 hours, and after 1, 2, 3, 4, 5, 6, 7, and 8 weeks. The relationship between stress relaxation and permanent deformation was investigated for various degrees of prestretch, and the estimated stress resulting from tooth movement was calculated. Results: The degree of prestretch and the stress relaxation ratio exhibited a strong negative correlation, whereas no correlation was found between the degree of prestretch and the average normalized permanent strain. The maximal estimated stress was observed when prestretch was performed in three cycles to 200% of the original length. Conclusions: Although prestretch benefited residual stress, it did not exhibit negative effects such as permanent deformation. The maximal estimated stress was observed at the maximal prestretch, but the difference between prestretch and control groups decreased with time. In general, higher residual stresses were observed for product B than for product A, but this difference was not clinically significant.
Files in This Item:
T201803637.pdf Download
DOI
10.4041/kjod.2018.48.6.384
Appears in Collections:
1. Journal Papers (연구논문) > 2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실)
1. Journal Papers (연구논문) > 2. College of Dentistry (치과대학) > Dept. of Dental Biomaterials and Bioengineering (치과생체재료공학교실)
Yonsei Authors
김경호(Kim, Kyung Ho) ORCID logo https://orcid.org/0000-0002-8154-2041
김광만(Kim, Kwang Mahn)
유형석(Yu, Hyung Seog) ORCID logo https://orcid.org/0000-0002-1275-5078
차정열(Cha, Jung Yul)
황충주(Hwang, Chung Ju) ORCID logo https://orcid.org/0000-0003-3024-4551
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URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/165219
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