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Effects of long-term fixed orthodontic treatment on salivary nickel and chromium levels: a 1-year prospective cohort study.
- Source :
-
Biological trace element research [Biol Trace Elem Res] 2012 Dec; Vol. 150 (1-3), pp. 15-20. Date of Electronic Publication: 2012 May 29. - Publication Year :
- 2012
-
Abstract
- Effect of long-term orthodontic treatment on salivary nickel and chromium has not been quite assessed except in few retrospective studies with controversial results. The aim of this prospective study was to measure salivary levels of these ions during 1 year of orthodontic treatment. Saliva samples were collected from 20 orthodontic patients, before treatment (control) and 6 and 12 months later. Nickel and chromium concentrations were determined using atomic absorption spectrophotometry. Data were analyzed using one- and two-way repeated-measures ANOVA, Bonferroni, Friedman (α = 0.05), and Wilcoxon signed-ranks tests (α = 0.016). Average nickel level changed from 9.75 ± 5.02 to 10.37 ± 6.94 and then to 8.32 ± 4.36 μg/L in 1 year. Average chromium concentration changed from 3.86 ± 1.34 to 4.6 ± 6.11 and then to 2.04 ± 1.66 μg/L. Alterations in nickel values were not statistically significant [P = 0.468 (ANOVA)], but fluctuations in chromium levels were [P = 0.021 (Friedman)]. The decrease in chromium concentration after 12 months was significant compared to the control [P = 0.004 (Wilcoxon)]. Although slightly increased after 6 months, the concentration of both ions dropped to levels slightly lower than the control groups after 12 months.
- Subjects :
- Adolescent
Adult
Chromium chemistry
Chromium toxicity
Cohort Studies
Dental Alloys adverse effects
Dental Alloys chemistry
Female
Humans
Iran
Male
Materials Testing
Nickel adverse effects
Nickel chemistry
Nickel toxicity
Orthodontic Brackets adverse effects
Orthodontic Wires adverse effects
Prospective Studies
Solubility
Spectrophotometry, Atomic
Stainless Steel adverse effects
Stainless Steel chemistry
Time Factors
Titanium adverse effects
Titanium chemistry
Young Adult
Chromium analysis
Nickel analysis
Orthodontic Appliances adverse effects
Saliva chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 1559-0720
- Volume :
- 150
- Issue :
- 1-3
- Database :
- MEDLINE
- Journal :
- Biological trace element research
- Publication Type :
- Academic Journal
- Accession number :
- 22644664
- Full Text :
- https://doi.org/10.1007/s12011-012-9457-y