# Occlusal Splints and Nightguards > Occlusal splints for NEET-MDS Prosthodontics: Michigan stabilization splint, repositioning splint, soft guards, design rules and bruxism management. - Canonical URL: https://prepelephant.com/topics/neet-mds/prosthodontics/occlusal-splints-nightguards-mds - Exam / course: NEET-MDS · Subject: Prosthodontics - Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team - First published: 2026-10-02 - Last updated: 2026-10-02 - How to cite: "Occlusal Splints and Nightguards", PrepElephant, https://prepelephant.com/topics/neet-mds/prosthodontics/occlusal-splints-nightguards-mds ## Direct answer A flat plane of clear acrylic across the teeth of one arch is the most widely prescribed reversible treatment in occlusal medicine: the occlusal splint disengages the occlusion, redistributes forces and relaxes the musculature — first-line for bruxism, myogenous temporomandibular disorders and protection of restorations. The prototype is the full-arch flat-plane stabilization splint (Michigan splint), usually maxillary, 2-3 mm thick, providing even bilateral posterior contacts in centric with smooth anterior guidance in excursions. The anterior repositioning splint holds the mandible forward to recapture a displaced disc, but full-time wear risks irreversible posterior open bite, so it is used briefly and with monitoring. Soft thermoformed guards are cheap protectors for bruxers and sports; partial-coverage devices such as the NTI-type anterior splint need strict supervision for the same bite-change reason. A splint treats symptoms and protects hardware — it does not correct occlusion by itself, and its diagnosis precedes its design. ## What you must remember - **Stabilization (Michigan) splint:** full-arch, usually maxillary, flat plane; even bilateral contacts in centric, anterior guidance in excursions, about 2-3 mm thick; worn at night for bruxism and muscle pain. - **Mechanisms:** disengages interferences, redistributes forces over all teeth, reduces elevator muscle electromyographic activity, and provides cognitive awareness that breaks grinding loops. - **Repositioning splint:** postures the mandible forward to capture a reducing disc; worn full-time briefly, then weaned — the recognised risk is a persistent posterior open bite if left unsupervised. - **Soft guards:** thermoformed ethylene vinyl acetate for protection and sport; comfortable and cheap, with limited effect on muscle pain. - **Partial-coverage splints** (NTI-type, incisors only): risk unwanted tooth movement or bite opening — prescription with scheduled review only. - **Indications:** sleep bruxism, myofascial and muscle-driven TMD, protection of extensive restorations, and as a diagnostic phase before irreversible occlusal change. - **Fabrication route:** casts (facebow helpful, not mandatory) articulated in centric relation, processed clear heat-cured acrylic, adjusted at delivery in centric and excursions, reviewed within a week. - **Honest framing:** evidence rates occlusal splints effective for TMD pain relief, with no design proven superior, and the therapy is reversible — a phrase examiners reward. ## Adjusting a Michigan splint The appliance returns from the laboratory looking even; the mouth says otherwise. Seat it and test retention — it should adhere like a suction cup. With articulating paper at the retruded contact position, mark centric contacts: the goal is a point contact on every posterior tooth plus the anterior region bilaterally; high spots are relieved until all contacts mark simultaneously. In protrusion and lateral excursions, posterior marks must disappear as the incisors and canines take over along the flat ramp — any posterior interference in excursion is relieved until only anterior guidance remains. Comfort is checked: the patient should close without sensing a tilt, and speech should adapt within a day or two. Reviews at one week and one month refine contacts as the musculature settles; a bruxer's splint is inspected for wear facets mapping the grinding pattern, and the surface is re-planed when faceting deepens. In Indian dental colleges, heat-cured clear acrylic on a semi-adjustable articulator remains the standard fabrication at a fraction of private splint fees abroad — splints are underused by awareness, not affordability. ## How the exam frames it Three contrasts carry most questions: stabilization versus repositioning (flat plane for muscle pain versus forward posturing for disc displacement with reduction); hard versus soft (hard acrylic is therapeutic and adjustable, soft is protective); full versus partial coverage (full arch is safe, partial risks tooth movement). Stems describing "a patient waking with jaw pain and worn teeth" point to a stabilization splint; "clicking that disappears when biting forward" suggests trialling a repositioning splint; "returned after six months of unsupervised anterior-only splint wear with a posterior open bite" is the classic complication question. The viva favourite: "does a splint cure bruxism?" — it manages and protects; the grinding aetiology (stress, sleep architecture, airway) usually persists beyond the appliance. ## Frequently asked questions ### What is a Michigan splint? A full-arch flat-plane stabilization splint, usually maxillary, giving even bilateral centric contacts with anterior guidance in excursions, used for bruxism and muscle-related temporomandibular pain. ### How does an occlusal splint relieve muscle pain? By disengaging deflective interferences and providing stable, even contacts, it reduces elevator muscle hyperactivity and breaks parafunctional habits through awareness. ### Why is the repositioning splint used cautiously? Because it holds the mandible forward, full-time unsupervised wear can leave a persistent posterior open bite; it is prescribed briefly, with weaning and monitoring. ### When is a soft nightguard preferred over hard acrylic? For straightforward protective management of bruxism or sports, when comfort and cost matter more than adjustability and therapeutic muscle effects. ### Which splint carries the risk of tooth movement? Partial-coverage designs such as anterior-only (NTI-type) splints, which can allow unopposed tooth eruption or intrusion — hence scheduled review is mandatory.