What type of wire is often used during the initial stages of orthodontic treatment for its flexibility?

Nickel titanium is recognized for its unique properties, especially its flexibility and resilience, which are crucial during the early stages of orthodontic treatment. This type of wire has the ability to exert a continuous, gentle force over a longer period, which is essential for gradually shifting teeth into their desired positions. The flexibility allows for easier manipulation and comfort for patients, reducing the risk of excessive pressure on the teeth and surrounding tissues.

In contrast, stainless steel, while strong and durable, lacks the same level of flexibility as nickel titanium and is often used later in treatment when more precise forces are needed. Beta titanium offers a balance between flexibility and strength but does not match the super-elastic characteristics that nickel titanium provides. Aluminum, while lightweight and flexible, is not typically used in orthodontic applications due to its lack of strength and durability compared to the other materials. This makes nickel titanium the preferred choice for initial stages of treatment where a gentle, adaptable approach is necessary.