Comparison of force decay pattern in orthodontic elastomeric chains and NiTi closed coil springs, affected by five different mouthwashes: An in vitro Study

Auteurs-es

  • Amir Hossein Mirhashemi Associate professor, Department of Orthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran https://orcid.org/0000-0002-0817-0843
  • Niloofar Habibi Khameneh Dental student, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
  • Keyvan Shahpoorzadeh Dental student, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
  • Atefe Saffar Shahroudi Assistant professor, Dental research center, Dentistry research institute, and Department of Orthodontics, Dental school, Tehran University of Medical Sciences, Tehran, Iran http://orcid.org/0000-0002-4536-2713

DOI :

https://doi.org/10.5195/d3000.2021.158

Mots-clés :

Force reduction, orthodontics, mouthwash, elastomeric chain, closed coil springs

Résumé

Background: The aim of this study was to compare the force decay pattern of elastomeric chains and NiTi coil springs which were exposed to five different commercially available mouthwashes.

Methods: In this in vitro study, 60 pieces of elastomeric chain (EC) and 60 NiTi closed coil springs (CS) were divided into 6 groups. The specimens were exposed to one of these mouthwashes twice a day for 60 seconds:  Listerine, chlorhexidine, Orthokin, Persica, fluoride and artificial saliva as the control group. The elastomeric chains and NiTi springs were stretched so that they exert the initial force of 250 gr. Their force was measured on the 1, 7, 14 and 28 following days by means of a digital gauge.

Results: Elastomeric chains and coil springs had force decrease over time, but EC' force reduction was greater with the highest reduction rate in the first week. However, in the CS group, the force decrease wasn't statistically significant in the first two weeks.  After 28 days in the control groups, 49.8% of the initial force was remained in ECs while the value was 93.3% for CSs. In comparison between mouthwashes, in EC groups, in all mouthwashes except Persica, the remained force was statistically less than control group.

Conclusion: Force degradation of elastomeric chains could be exacerbated by use of mouthwashes. About coil springs, force decay was also observed. However, it was not statistically significant. Force reduction was detectable after four weeks of coil springs usage, but in EC groups, the greatest reduction was after the first week.

 

 

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Publié-e

2021-10-28

Numéro

Vol. 9 No. 1 (2021)

Rubrique

Adults & the Elderly

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