| Field | Value |
|---|---|
| ID | OA-0322 |
| Type | bruxism_TMD |
| Category | bruxism_TMD |
| Fixed/removable | removable (standard) |
| Primary function | mandibular repositioning; TMD relief; bruxism protection |
| Malocclusion target | TMD; Class II; condylar disc displacement; bruxism |
| Inventor | Gelb (Gelb appliance); updated by various |
| First year | 1970s |
| Period | historical / current |
| Status | current |
| Arch | lower |
| Uses TADs | no |
The MORA (Mandibular Orthopedic Repositioning Appliance), also known as the Gelb appliance, is a lower arch splint designed to reposition the mandible into a forward position, decompressing the temporomandibular joint and optimizing the condyle-disc-fossa relationship. Unlike upper occlusal splints (which cover the upper arch), the MORA is fabricated for the lower arch, making it less visible and more comfortable for many patients. It consists of acrylic bite pads covering the lower molars and premolars, connected by a heavy lingual bar. The MORA is used primarily for TMD management, condylar disc displacement, and as an orthopedic repositioning device in neuromuscular dentistry protocols.
The MORA establishes the mandible in a forward, slightly open position that unloads the TMJ by reducing posterior condylar compression. By holding the mandible in this orthopedic position during wear, the appliance allows the pterygoid muscles to relax, the inflamed posterior joint tissues to decompress, and the disc-condyle relationship to normalize. Bite pads on the posterior teeth distribute occlusal loads evenly, while the lingual bar prevents appliance displacement. The lower arch design eliminates upper palate coverage, improving patient tolerance and compliance.
TMD pain and dysfunction; condylar disc displacement (with or without reduction); neuromuscular dentistry cases requiring condylar repositioning; bruxism with TMJ symptoms; Class II cases where mandibular repositioning is the first phase of treatment; patients who cannot tolerate upper splints (palatal sensitivity, gag reflex). The MORA is used diagnostically — if symptoms resolve with the MORA in a forward position, orthognathic treatment or dental reconstruction at the new jaw position may be indicated.
Not a definitive treatment — the MORA establishes a therapeutic position that must eventually be stabilized with occlusal therapy, orthotics, or comprehensive dental reconstruction. Long-term unilateral or full-time wear without follow-up may produce dental changes (posterior open bite if worn excessively). Requires neuromuscular or TMD-focused practitioner for proper jaw registration.
(bilateral)
rigid SS or acrylic)
electrical neuromuscular stimulation or clinical bite registration to the therapeutic position)
The construction bite registration is critical — the MORA must be fabricated at the exact therapeutic jaw position (forward, slightly open) prescribed by the clinician. Acrylic bite pads must be even and balanced bilaterally. The lingual bar must be strong enough to withstand chewing forces without flexing — a flexing bar alters the occlusal relationship and undermines the therapeutic effect. CFL products: MORA , Clear Fusion MORA, Clear Fusion Everlast MORA Gelb , NORD. The Everlast and clear variants suggest premium material or design differences.
anterior-only contact for muscle relaxation.
protection without repositioning.
Appliances](https://specialtyappliances.com/product/the-mora/)
CRANIO 1987](https://www.tandfonline.com/doi/abs/10.1080/08869634.1987.11678210)
Global](https://www.smlglobal.com/mora-appliance-l)
application, fabrication, business notes.