EFFECT OF UHT MILK ON FRICTION OF STAINLESS STEEL (SS) AND NICKEL TITANIUM (Ni-Ti) WIRE- AN IN VITRO STUDY

Abstract

Friction in orthodontic treatment were essential factor in biomechanical tooth movement, that infulenced by biological factors such as corrosion can inhibit tooth movement, thereby extending the duration of orthodontic treatment. UHT milk is a nutrient-rich drink that is often consumed by the public and is a weak acid solution. To investigate the effect of UHT milk on stainless steel and nickel-titanium wire friction. A total of 24 ORMCO® SS 0.018 and Ni-Ti 0.018 wires were used in this experimental study. The frictional SS and Ni-Ti wires immersed (8 groups n=3) in the following two solutions were measured: UHT Milk and artificial saliva for 7.5 hours, 10 hours 37°C in incubator, respectively. Static and dynamic frictional forces were measured using Universal Testing Machine. Independent T-test analyses were applied to compare the groups for significant differences (P<0.05). Average value Ni-Ti wire friction is greater than SS wire when immersed with UHT milk even though the analysis results showed no difference significantly. No effect of UHT milk on the friction of stainless steel and nickel-titanium wires.