Intermaxillary elastics are primarily used in orthodontics to correct sagittal discrepancies by applying continuous interarch forces that guide the jaws into a more favorable relationship. In Class III malocclusion, these elastics typically exert a retrusive force on the mandible while promoting maxillary advancement. This helps in improving the anteroposterior jaw alignment non-surgically or adjunctively before surgery. Their use is critical in managing mild to moderate Class III cases by modifying functional jaw positioning and dental compensation.

Reference: Proffit, Contemporary Orthodontics, 6th Edition.