Related Experiment Video
Updated: Jul 15, 2026

Micro-dissection of Enamel Organ from Mandibular Incisor of Rats Exposed to Environmental Toxicants
Published on: March 29, 2018
Urinary excretion levels of nickel in orthodontic patients
Luciane Macedo Menezes1, Catia Abdo Quintão, Ana Maria Bolognese
1Orthodontic Department, Pontifical Catholic University, Porto Alegre, RS, Brazil. luciane@portoweb.com.br
Introduction:
Nickel, a primary component of orthodontic appliances, causes more allergic reactions than all other metals combined and can initiate a wide range of hypersensitivity reactions in susceptible subjects. The purpose of this study was to compare pretreatment and treatment levels of nickel in the urine of orthodontic patients wearing fixed appliances.
Methods:
Urine specimens were collected from 21 orthodontic patients (12 female, 9 male) before placement of orthodontic appliances and 2 months after placement. Nickel ion analysis was carried out with atomic absorption spectrophotometry. The results were submitted to descriptive analyses, the Student t test, and ANOVA for repeated measurements (P <.05).
Results And Conclusions:
Urinary nickel levels increased significantly 2 months after the placement of orthodontic appliances. The results were similar in both sexes. Continued follow-up is needed to determine the patterns and the long-term significance of nickel release.
More Related Videos
09:23Removal of Trace Elements by Cupric Oxide Nanoparticles from Uranium In Situ Recovery Bleed Water and Its Effect on Cell Viability
Published on: June 21, 2015
03:07Scanning Electron Microscopic Evaluation of Surface Defects of Remover Retreatment File After Single and Multiple Uses
Published on: October 11, 2024
Related Concept Videos
Precipitation Gravimetry
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
Urinary Tract Calculi V: Nursing Management
Nursing Assessment of the Genitourinary System II: Inspection and Palpation