Potency of Bilimbi Fruit (Averrhoa Bilimbi L.) Leaf Extract as Corrosion Inhibitors of Stainless Steel Orthodontic Wires

摘要

To determine the effects of Bilimbi fruit leaf (BL) extract on the corrosion rate of stainless steel orthodontic wires. A total of 60 stainless steel orthodontic wires (0.7 mm in diameter) were divided randomly into 4 groups (n=15): negative control group (control), 3% Bilimbi fruit leaf extract (B03), 6% Bilimbi fruit leaf extract (B06), and 10% Bilimbi fruit leaf extract (B10). Samples were immersed in artificial saliva and incubated at a temperature of 37°C for 7 days. Subsequently, the rate of corrosion was determined using a weight loss measurement method. The data were then analyzed using one-way analysis of variance (ANOVA) followed by least significant difference (LSD) post hoc test (P < 0.05). One-way ANOVA showed a significance P-value of < 0.05 (P = 0.000). Post-hoc LSD test also showed that there was a significant difference between control and treatment groups, in which the group immersed in 10% of BL extract had the lowest corrosion rate compared to the other two experiment groups. In addition, the 10% BL extract group had the highest percentage inhibition efficiency compared to the other two groups (79.84%). It can be concluded that Bilimbi fruit leaf extract can inhibit corrosion of stainless steel orthodontic wires. Ten percent of BL extract demonstrated a greater corrosion inhibition efficiency compared to 3% and 6% of the extract.