The Advance sync appliance is one of many orthodontic devices that is designed to correct overbites (actually called overjet in the dental community). The Advance Sync appliance is made by Ormco Corporation. Because it is non-removable by the patient, it fits into the category of “fixed functional appliances.”
Although there may be variations in design, the Advance Sync appliance is basically a miniscope system that requires a patient to position their lower jaw forward in order to bring their front teeth together. It is called a functional appliance because it requires the patient to function with their jaw in the desired position theoretically encouraging the jaw to “grow” there. Basic Advance Sync design employs “ a miniscope or pistons ”, in the upper arch first molars crown bands are connected to the piston arms that extends sideways on to the lower first molar crown bands. The pistons extend at an angle connecting the upper and lower jaw and position the lower jaw in the desired position. When correctly adjusted, the only way the patient can bite down is to slide the lower jaw forward as guided by the pistons.
As with any orthodontic tool, the Advance Sync has advantages and disadvantages. Advantages are that it is permanently attached to the teeth and cannot be removed by the patient, it is completely invisible from the outside of the mouth, it can be used before or during the braces phase of treatment, and the connection between the upper and lower jaws allows free mouth opening, eat easily and perform other day to day activities and more importantly does not affect the speech (so a patient can open his or her jaw as wide as they want). Facilitates side-to-side jaw movement and the pistons are 50% shorter than its predecessors. The disadvantages are that it can irritate the cheeks initially in some patients; it is not always effective in patients with extreme overjets.
As with ALL functional appliances, the Advance Sync reduces overbites primarily by jaw growth and also by shifting the teeth. There may also be some effect on the height of the face (opening the bite), which can be desirable in deep bite cases but contraindicated in open bite patients. As much as we wish functional appliances could cause the jaws to grow more than they would on their own, there is no scientific evidence to support that they do. They are effective however in reducing the amount of overbite and are therefore useful in many patients regardless of how the results are achieved.
I tend to use the Advance Sync only on patients who are late growers, asymmetric jaw relationship and non compliant with removable functional appliances. The appliance is very popular with boys than with the girls, considering most girls, are compliant in wearing removable functional appliance. However there is always an exception to the above.
Case illustration of a patient treated by Advance sync fixed functional appliance along with conventional fixed appliance.