Each quarter turn of an expansion screw results in a precise, controlled expansion of 0.25 mm, which allows for gradual and safe widening of the desired anatomical structure. This measurement is standardized to ensure predictable clinical outcomes while minimizing the risk of complications such as tissue overstretching or fracture. Surgeons rely on this incremental adjustment to monitor patient response and modify expansion accordingly, ensuring optimal tension and adaptation of surrounding tissues. Maintaining this controlled rate is critical for successful expansion in procedures like palatal or bone distraction surgery.

Reference: Contemporary Orthodontics, 6th Edition.