This appliance uses the standard Twin Block approach for treatment mechanics. Clasping is, however, quite unique. Composite ledges (blue acrylic) create undercuts that provide superior retention for circumferential clasps. This technique is particularly useful when the teeth that are used for retention have short clinical crowns. If desired, the free end of the circumferential clasps can be finished in a loop, making it easy for the patient to remove the appliances for cleaning.