| Field | Value |
|---|---|
| ID | OA-0119 |
| Type | functional_appliance |
| Category | functional_appliance |
| Fixed/removable | fixed |
| Primary function | Class II correction via mandibular protrusion |
| Malocclusion target | Class II malocclusion; overjet reduction |
| Manufacturer | TP Orthodontics |
| Inventor | Miller (1996) |
| First year | 1996 |
| Period | modern |
| Status | current |
| Uses TADs | no |
The Flip-Lock Herbst is a variant of the classic Herbst appliance (see Reverse pull headgear) introduced by Dr. Miller in 1996 and commercialized by TP Orthodontics. The defining feature is the flip-lock mechanism — a ball-and-swivel attachment on both upper and lower connections that replaces the traditional pin-and-tube mechanism. This design eliminates pins, screws, and springs entirely, allowing fast activation by simply flipping the lock. The ball-and-swivel joint provides significantly greater lateral mandibular freedom (freedom of lateral excursion) than conventional Herbst designs, reducing the "locked-in" feeling patients experience with standard Herbst appliances and lowering the breakage rate.
Identical to classic Herbst in principle: a bilateral piston-cylinder (or bar-and-socket) mechanism holds the mandible in a protruded position 24/7, producing continuous forward mandibular posturing. This stimulates mandibular growth, distalizes the upper arch, and corrects the Class II relationship over 9–12 months. The flip-lock mechanism enables rapid activation without tools (no screwdriver required). The ball-and-swivel joint allows lateral jaw movements, reducing patient discomfort and appliance stress that leads to breakage.
Growing Class II patients (9–15 years); significant overjet with mandibular retrognathia; early/comprehensive treatment; cases where conventional Herbst breakage has been a problem; practices wanting a more patient-friendly Herbst design.
Same as all Herbst variants: not for adults with completed growth; requires full compliance (fixed, but patient can attempt to open beyond limits); requires molar band cementation; initial speech and eating adaptation; skeletal Class II in adults requires orthognathic surgery.
Flip-Lock Herbst components are manufactured by TP Orthodontics. Molar bands are lab-fabricated. The flip-lock mechanism is attached to the bands by the lab or chairside. CFL can fabricate the molar band component; TP supplies the mechanism.
superstructure; most durable, requires banding
sleeve-and-rod; can be banded or bonded
bulk, easier adjustments
non-telescopic cast metal alternative to Herbst
integrated palatal expansion screw
Orthodontics](https://www.tportho.com/products/class-ii-correction/flip-lock-herbst-2/)
PMC](https://pmc.ncbi.nlm.nih.gov/articles/PMC8058159/)
US](https://orthopracticeus.com/herbst-appliance-update/)
design, 1996 Miller origin, comparison with M4 and classic Herbst.