Which retainer wins? study tests which wire keeps teeth straight longer

This study compares two types of fixed retainers (thin wires glued behind the lower front teeth) to see which one lasts longer after braces. About 133 people aged 15-50 who finished orthodontic treatment will be randomly assigned to get either a round twisted wire or a braided rectangular wire retainer. Researchers will check the retainers over two years to see how often they break or come loose, and also ask about comfort and oral hygiene.