| Field | Value |
|---|---|
| ID | OA-0125 |
| Type | occlusal |
| Category | occlusal |
| Fixed/removable | removable |
| Primary function | bruxism protection; TMD; centric relation stabilization |
| Malocclusion target | bruxism; TMD |
| Material | nylon (polyamide) thermoplastic |
| Uses TADs | no |
The nylon flat-plane splint is a full-coverage upper arch occlusal appliance made from nylon thermoplastic with a flat posterior occlusal surface (no anterior guidance ramp). The flat plane design provides even posterior tooth contacts at centric relation, distributing bruxism forces across all teeth. It is the standard nightguard concept executed in nylon rather than acrylic — the nylon's flexibility and crack resistance make it more comfortable and durable than a traditional acrylic Michigan splint. The flat plane approach is evidence-based for TMD management (no directional guidance that could alter mandibular position).
Full posterior coverage at centric relation establishes even occlusal stops, preventing destructive force concentration. The flat surface allows the mandible to slide freely in all excursive movements (protrusion, lateral) without incline guidance — this reduces lateral force components on the teeth and TMJ. Nylon's slight flexibility absorbs some parafunctional force rather than rigidly resisting it. The evidence for flat-plane splints in TMD management is well-established — reducing posterior occlusal loading decreases masseter hyperactivity over time.
Bruxism (moderate-to-severe); TMD with myofascial pain; occlusal force distribution for patients with multiple restorations; patients who break acrylic guards; general protective appliance for nighttime use; cases where a simple flat-plane design is clinically preferred over an anterior-guided splint.
No anterior guidance means less directed jaw positioning on closure — may not fully address condylar seating issues. Nylon material cost is higher than standard EVA. Requires precise articulation for even posterior contacts.
centric relation
Even bilateral posterior contacts must be verified on articulated models — any premature contact creates lateral forces and defeats the therapeutic purpose. Flat surface should be polished smooth for smooth mandibular excursions. CFL offers nylon splints as part of the splint product line.
guidance ramp.
classic TMD design.
Therapeutics](https://www.orofacialtherapeutics.com/blog/what-are-anterior-bite-plane-splints/)
PMC](https://pmc.ncbi.nlm.nih.gov/articles/PMC8185153/)
evidence, fabrication.