Study on the Friction Generated by Aesthetic Arches Covered with Rhodium
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Abstract
Introduction: Aesthetic metal archwires are more discreet than conventional metal archwires. One of the most commonly used aesthetic metal archwires in orthodontics consists of a rhodium-coated Nickel Titanium (NiTi) alloy core. Rhodium is an extremely hard metal and has a high reflectance, making the NITi metal archwire with rhodium coating an aesthetic solution for orthodontic treatment. Objective: To present the evaluation of the friction generated on three types of arches. Materials and Methods: An experimental design was performed using 30 archwires of 0.016" x 0.022" of three different characteristics: NiTi without esthetic coating, NiTi with rhodium coating, and NiTi with Teflon coating. These archwires were placed in 20 experimental models made of acrylic to which 40 brackets In-Ovation R ® (Dentsply Sirona) slot 0.018x 0.025" were placed. To simulate oral conditions the archwires were pulled at different distances: 3mm, 6mm, 7mm, and 8mm at a speed of 10 mm/min in the deflection testing machine using artificial saliva at 25°C as lubricant and the friction generated was measured. Results: The results showed statistically significant differences in the friction generated by uncoated NiTi archwires when compared to NiTi with rhodium and Teflon coating (p>0.0001) Conclusions: Orthodontic archwires with rhodium coating are more aesthetic and do not alter the original dimensions or properties of the wires. Rhodium coating generates less friction in orthodontic tooth movement.
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