Efektifitas Ekstrak Biji Buah Alpukat (Persea americana Mill) dalam Menghambat Pelepasan Unsur Logam Kawat Ortodonti Berbahan Dasar Nikel Titanium

Corrosion of orthodontic wires in the oral environment leads to the release of metal elements, particularly Nickel, which may reduce wire quality and pose potential health risks. Tannins found in avocado seeds are known to promote the formation of a protective passive layer on metal surfaces, potentially inhibiting corrosion. This study aimed to evaluate the effect of avocado seed extract on reducing Nickel and Titanium release from Nickel-Titanium orthodontic wires. Rectangular Nickel-Titanium wires (0.017 × 0.025 inches) were divided into three groups: a control group immersed in artificial saliva and two treatment groups immersed in avocado seed extract at concentrations of 1.5 g/L and 2 g/L for seven days.Metal release was measured using X-Ray Fluorescence (XRF). Data were analyzed using one-way ANOVA and Post Hoc LSD tests (p < 0.05). Significant differences were found between the control and treatment groups (P < 0.05). Wires immersed in avocado seed extract showed lower release of Nickel and Titanium compared to the control group. The 2 g/L concentration demonstrated greater inhibition effectiveness than 1.5 g/L. Avocado seed extract effectively reduced metal release from Nickel-Titanium orthodontic wires. The tannins contribute to forming a stable protective layer, serving as a natural corrosion inhibitor.