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Abstract

Aim: The aim of this study was to estimate the amount of nickel and chromium released from fixed orthodontic appliance in two different artificial saliva media (normal pH salivary media and oxidizing salivary media) and to estimate the weight loss of the fixed appliance. Materials and Methods: This in vitro study was performed using a classic batch procedure by immersion of the samples in two artificial salivary media: (a) In normal salivary media and (b) in oxidizing salivary media. A classic bath consists of (a) 4 molar bands, (b) 20 brackets, and (c) 2, 0.016 NiTi upper and lower archwires. Two beakers were taken with 200 ml of artificial saliva, respectively. In 1 beaker, 2 ml of 5% hydrogen peroxide was added to achieve oxidizing media. Dry weight of the batch was tested at the start of the treatment. Nickel and chromium content was tested in the artificial saliva before the start of the treatment using atomic absorption spectrophotometer. The batches were then immersed into the saliva in the beakers. Applying Arrhenius equation, the salivary media were heated up to 60°C so as to accelerate the rate of reaction and was maintained for 8 h. At the end of the treatment, nickel and chromium were estimated using an atomic absorption spectrophotometer. The batches were dried, and the dry weight was again checked to estimate the weight loss. Results: In this study, it is noticed that nickel is not released in detectable amount. However, chromium release is noticed in both the salivary mediums after heat treatment and is high in the oxidizing media as compared to the normal media, indicating that an oxidizing media have an effect and favor the release of chromium. Chromium is found to be slightly more than the daily dietary allowance but is within the therapeutic level.

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	JPR Solutions

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