Pelepasan Ion Nikel pada Kawat Ortodonti Stainless Steel yang Direndam dalam Sodium Bikarbonat

Abstract

Stainless steel wires are a common type of orthodontic wire known for their rigidity and resistance to deformation, making them ideal for use as archwires. The warm and humid conditions of the oral cavity, along with fluctuations in temperature and pH, create a highly conducive environment for corrosion. Corrosion can lead to the release of metal ions, which may be toxic and cause allergic reactions. This study aimed to determine the differences in the amount of nickel ions released from stainless steel orthodontic wires soaked in artificial saliva and sodium bicarbonate solutions at concentrations of 0,16%, 0,84%, 4,2%, and 8,4% over 7 and 14 days as treatment groups. The research samples consisted of 40 stainless steel orthodontic wire specimens, which were immersed in five different solutions: artificial saliva, and sodium bicarbonate at concentrations of 0,16%, 0,84%, 4,2%, and 8,4%. The immersion samples were stored in an incubator at 37°C, and the nickel ion release was measured using Atomic Absorption Spectrometry (AAS). The results showed that on day 7, the lowest mean nickel ion release was observed in the 0,16% sodium bicarbonate group, while on day 14, the lowest mean nickel ion release was found in the 4,2% sodium bicarbonate group. ANOVA test results indicated significant differences in nickel ion release among the different solution groups at all immersion durations. In conclusion, there were significant differences in the amount of nickel ion release between the control and treatment groups.