Abstract
Aims: To evaluate the amount of nickel ion release from stainless steel orthodontic wires in different artificial saliva and in different time periods. Materials and Methods: This study included six different commercial stainless steel orthodontic wires with different diameters. They were immersed in deionized water (control) and three different artificial saliva, the immersion periods included 7, 14, and 30 days. A graphite-furnace atomic absorption spectrometer (AAS) was used to determine the amount of nickel ions release. Results: The statistical analysis showed that there is a highly significance in the release of nickel ions for all types of wire except wires 0.18, and 0.16 x 0.22 which gave non-significant 2.45 and 1.37 respectively, and the time period of immersion had no significant effect in all types of wire. Conclusions: The release of nickel ions was influenced by the types of wire and the surface areas that in contact with immersion in solution, in addition to the composition of the orthodontic wires, but this were not proportional to the content of metal in the wire.
Highlights
Dentistry has the main purpose for keeping or improving the patient's quality of life by preventing diseases, relieving pain and improving the masticatory efficacy, phonetics and/ or esthetics
The accumulated amount of nickel ion increased with longer immersion period for all wires tested a slower increasing trend of metal ion with longer immersion period was observed in deionized solution
The release of nickel ions from orthodontic stainless steel wires is a phenomenon that cannot be avoided; it is difficult to find a material that will be fully stable within an organism and will show no signs of biodegradation
Summary
Dentistry has the main purpose for keeping or improving the patient's quality of life by preventing diseases, relieving pain and improving the masticatory efficacy, phonetics and/ or esthetics. Most of these objectives require replacement or alteration of the existing dental structures, as well as changes in the tooth positioning, developing and selecting biocompatible materials have been one of the major challenges in dentistry.[1] Metals, P ceramics, polymers and composites are the four groups of materials that are currently employed.[2]. Release of nickel from orthodontic appliances has been noted using microscopic analysis of corrosion, as well as chemical analyses of orthodontic components when exposed in an artificial oral environment.[16,17,18,19] When in-
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