Orthodontic Assistant Practice Exam

Which orthodontic procedure helps in expanding the dental arch?

1. Extraction

2. Transpalatal arch placement

3. Palatal expansion

4. Bracket placement

The correct answer is: Palatal expansion

The procedure that helps in expanding the dental arch is palatal expansion. This technique is specifically designed to widen the upper jaw (maxilla) and create more space for teeth alignment, particularly in cases where there is crowding or crossbite. Palatal expansion involves the use of a device, often referred to as an expansion appliance, which is attached to the upper molars. As the appliance is activated, it applies pressure to the palatal suture in the midline of the maxilla, encouraging the bones to gradually move apart. This is particularly beneficial in growing children, as their bones are still developing and more responsive to such interventions. The wider arch improves dental alignment and function, and it can also help improve facial aesthetics. In contrast, other procedures listed, such as extraction, involve the removal of teeth to make space for others rather than expanding the dental arch itself. The placement of a transpalatal arch does provide some support and stability for the posterior teeth but does not actively widen the arch. Bracket placement, while important for the overall orthodontic treatment, is more about ensuring teeth are aligned and does not involve arch expansion.