A MARA (Mandibular Anterior Repositioning Appliance) is a fixed orthodontic device used primarily to correct severe Class II malocclusions, commonly known as overbites, in growing children and teenagers. Unlike removable appliances, it is anchored to the molars and stays in the mouth throughout treatment to ensure continuous correction.
The appliance consists of metal "elbows" on the upper molars and horizontal "arms" on the lower molars.
When the patient closes their mouth, the elbows guide the lower jaw forward into a more ideal position.
It trains the jaw muscles and promotes skeletal and dental alignment by making it impossible for the patient to bite down comfortably unless their jaw is in the forward position.
Orthodontists can add small metal spacers called "shims" to the appliance over time to gradually advance the jaw further as treatment progresses.
Because it is fixed, treatment does not rely on patient compliance (unlike removable elastic bands).
It is more compact and discreet than a Herbst appliance because it lacks external telescopic arms, allowing for better side-to-side jaw movement.
It can be worn simultaneously with traditional braces, which often reduces the total time needed for orthodontic correction.
It can sometimes prevent the need for more invasive procedures like tooth extractions or orthognathic surgery.
The device is typically worn for 9 to 18 months, depending on the severity of the overbite and the patient's growth rate.
Patients often experience temporary cheek irritation and muscle soreness for about 1 to 2 weeks as the mouth adapts to the appliance.
Users must avoid very hard, sticky, or crunchy foods (like ice, nuts, or hard candy) to prevent the appliance from breaking or coming loose.