U-Files (also known as Ultrasonic Files) are stainless steel files designed to be mounted onto an ultrasonic handpiece. Unlike standard hand files, U-Files are activated by ultrasonic vibrations, which allow them to perform various critical tasks within a root canal with greater efficiency and precision. They are primarily used for cleaning, irrigation, and removing obstructions.
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Features
Ultrasonic Activation: These files vibrate at a high frequency, creating acoustic streaming and cavitation in irrigation fluids. This helps to physically break down and flush out debris, bacteria, and the "smear layer" from the canal walls.
Vertical Motion: When activated, they move in a high-speed vertical sawing motion, which is effective for cleaning and shaping the canal.
Standardized Sizing: They are typically available in a range of ISO sizes (e.g., #15 to #40), identified by the colored bands on the shank (white, yellow, red, blue, green, and black), as shown in your image.
Precision and Control: Because they are used with a handpiece, they offer superior access and control compared to manual filing, especially in narrow or calcified canals.