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The aim of the present work was to investigate the exposure of patients to metals released from orthodontic appliances in situ. The paper reports the results of biocompatibility studies of orthodontic appliances by an in vivo method using hair sampled from the group of patients (N=28) and a control group (N=18). The mean content of metals (Ni, Cr, Mn, Fe) in hair that were hypothesized to be systemically...
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