The classic labial bow in removable orthodontic appliances was first designed by Charles Hawley. This bow is a key component used to apply gentle pressure for aligning anterior teeth and maintaining arch form. Hawley’s design remains fundamental due to its simplicity, effectiveness, and ease of adjustment in removable retainers. It consists of a wire that follows the labial aspect of the anterior teeth, providing controlled tooth movement and retention after active treatment. Its design principle has become the standard in removable orthodontic appliances, underpinning many modern retention strategies.

Reference: Graber’s Orthodontics, 7th Edition.