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  • 1 Pontifícia Universidade Católica de Minas Gerais, Programas de Pósgraduação — Mestrado em Odontologia Av. Dom José Gaspar, 500, Prédio 46 CEP 30535-610 Belo Horizonte-MG Brazil
  • 2 Nuclear Technology Development Centre/CDTN-Brazilian Commission for Nuclear Energy/CNEN Belo Horizonte-MG Brazil
  • 3 Pontifícia Universidade Católica de Minas Gerais, Programas de Pós Graduação Belo Horizonte-MG Brazil
  • 4 Nuclear Technology Development Centre/CDTN-Brazilian Commission for NuclearEnergy/CNEN, Laboratory for Neutron Activation Analysis Belo Horizonte-MG Brazil
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Abstract  

The present study determines the elementary alloy composition of ten commercial brands of brackets, especially related to Ni, Cr, and Co metals, confirmed allergenic elements. The nuclear techniques applied in the analyses were X-ray fluorescence (XRF) — Centre National de la Recherche Scientifique, France (National Center of Scientific Research), and X-ray energy spectrometry (XRES), and Instrumental Neutron Activation Analysis (INAA) — CDTN/CNEN, Brazil. The XRES and XRF techniques identified Cr in the 10 samples analyzed and Ni in eight samples. The INAA technique identified the presence of Cr (14% to 19%) and Co (42% to 2400 ppm) in all samples. The semi-quantitative analysis performed by XRF also identified Co in two samples. The techniques were effective in the identification of metals in orthodontic brackets. The elements identified in this study can be considered one of the main reason for the allergic processes among the patients studied. This finding suggests that the patients should be tested for allergy and allergenic sensibility to metals prior to the prescription of orthodontic device.