The Adjustable Herbst® is a two piece construction held together with two inseparable hinged mechanisms on the facial of the upper and lower appliances. The hinged mechanisms are designed with advancement screws
to allow for titration and advancement of the mandible. The Adjustable Herbst® is designed for incremental advancement of the mandible to the desired position. The advancement screws have a 5mm range with an
adjustment ratio of 16:1 or 16 quarter turns to one millimeter.