Modified Herbst Appliance
This appliance is MEDICARE APPROVED due to its 'hinge' and design. It has telescopic rods connecting the upper and lower parts together. The telescopic rods are threaded which allows them to be adjusted to the best position.
Dorsal Fin Appliance
Generally, this type of appliance has large, plastic fin-like projections coming up from the lower part which rest on acrylic blocks. These acrylic blocks are attached to the outside of the upper appliance. The upper blocks push the “fins” forward thereby causing the lower jaw to move forward. The upper blocks have screws, which are used to adjust the appliance to the best position. This type of appliance tends to be the most comfortable since the upper and lower parts are not attached to one another and the jaw can move more freely.
The TAP (Thorton Adjustable Positioner) Appliance
The TAP Appliance has an upper and lower component which are attached near the front teeth. A hook-like element from the upper appliance engages on a bar on the lower appliance and pulls the lower jaw forward. The appliance can be adjusted or 'titrated' to its most efficient position by turning a screw.