An occlusal splint is a removable, hard acrylic appliance that covers the occlusal surfaces of one arch to redistribute occlusal load, protect the dentition, and manage the symptoms of bruxism and temporomandibular disorder (TMD). It is worth being precise about what it does: a well-made splint protects teeth from parafunctional wear and can reduce TMD pain in the short term, but the evidence does not support it as a cure for bruxism itself. This guide separates what the literature actually shows from what patients expect, covers the splint types and the hard-versus-soft question, and sets out what makes a splint work at the bench.
What the evidence actually shows
Patients arrive convinced a splint will “stop the grinding”. The honest clinical position is more nuanced, and worth setting at the start.
For bruxism, the evidence is limited. A Cochrane review of occlusal splints for sleep bruxism concluded there is insufficient evidence to say splint therapy is superior to no treatment or to other approaches for reducing bruxism itself.¹ A more recent systematic review reached the same conclusion — insufficient evidence that splints reduce bruxism over no treatment — while noting a possible benefit in limiting tooth wear.² So the defensible indication is protection: the splint takes the wear and load instead of the dentition, rather than switching off a centrally driven sleep behaviour.
For TMD pain, the picture is more favourable. Meta-analyses show stabilisation splints reduce TMD pain in the short term, with the Michigan-type stabilisation splint effective for moderate pain, though the effect size tends to diminish over longer follow-up.³⁴ Splints are a reasonable, reversible first-line for painful TMD alongside conservative measures — not a definitive occlusal “correction”.
Framed this way, the splint is exactly what it should be: a protective, symptom-managing, fully reversible appliance — which is also why it is a sound first step before anything irreversible.
Splint types and the hard-versus-soft question
Not every splint is the same appliance, and the prescription should match the goal:
- Full-coverage stabilisation splint (Michigan / Tanner): a hard acrylic, full-arch splint providing even bilateral contacts in centric relation with canine or anterior guidance in excursions. This is the workhorse for both tooth protection and TMD pain management.
- Soft (thermoplastic) splint: comfortable and quick, but less durable; useful as a short-term or diagnostic appliance. The evidence on material is mixed — soft splints have ranked comparably to hard for some myogenous TMD, but hard stabilisation splints are generally preferred for durability and for arthrogenous presentations.⁴
- Anterior bite plane / NTI-type appliance: a small anterior-only device intended to reduce muscle activity. It has a role but carries a real risk of unwanted tooth movement or occlusal change if worn unsupervised, so it needs careful case selection and review.
For most protective and TMD cases, a hard, full-coverage stabilisation splint is the default, which is why Zenith’s occlusal splints are made from hard acrylic for durability with a balanced, polished occlusion.
What makes a splint work at the bench
A splint fails clinically when the occlusion on it is wrong, not usually when the acrylic is. The details that matter are the ones that have to be built in:
- Full coverage and a stable, retentive fit — so it seats reproducibly and does not tip or allow over-eruption.
- Even simultaneous contacts across the arch in the retruded position — the whole point of a “stabilisation” splint.
- Smooth excursive guidance (canine or anterior) that discludes the posterior teeth in lateral and protrusive movements.
- A polished, comfortable finish that the patient will actually wear.
Getting those contacts right depends on an accurate occlusal record, which is where a clean digital impression and a reliable bite registration do the heavy lifting — a splint designed on distorted records will need grinding in at the chair.
How Zenith makes your occlusal splints
Zenith fabricates hard acrylic occlusal splints designed for maximum durability, a custom retentive fit, and a balanced occlusion finished smooth and polished. Because the founder is a practising dentist, the occlusal scheme is built the way it needs to behave in the mouth — even contacts and clean guidance — not just milled to fit the model. We work from your intraoral scan and bite record, use MODJaw occlusion analysis where the case needs precise movement data, and return the design for approval before manufacture. You can see the range on our lab services, and we accept scans from 3Shape, iTero, Medit, DS Core, Carestream and Smilecloud.
For a bruxism or TMD case where the splint occlusion has to be right first time, send us the scan and we’ll make it with you.
FAQs
Frequently asked questions
Everything you need to know about working with Zenith Labs.
What is an occlusal splint?
An occlusal splint is a removable hard acrylic appliance covering the biting surfaces of one arch. It redistributes occlusal load to protect the teeth from parafunctional wear and to manage the symptoms of bruxism and TMD. It is fully reversible.
Hard or soft splint — which should I prescribe?
A hard, full-coverage stabilisation splint is the usual default for durability and for delivering even contacts and proper excursive guidance. Soft splints are comfortable and quick but wear faster and suit short-term or diagnostic use; the evidence on material is mixed and depends on the type of TMD.⁴
Occlusal splint or night guard — what’s the difference?
“Night guard” is the lay term patients use, and it usually means a simple protective appliance. A prescribed occlusal (stabilisation) splint is a precisely constructed hard appliance with defined even contacts and guidance, designed for tooth protection and TMD management rather than a generic over-the-counter guard.
Does an occlusal splint stop teeth grinding?
Not reliably. The evidence does not support splints as a cure for bruxism, which is largely a centrally driven sleep behaviour.¹² What a splint does well is protect the teeth from the wear that grinding causes and, in TMD cases, reduce pain in the short term.³ It manages the consequences rather than stopping the habit.
How long does an occlusal splint last, and how is it cared for?
A well-made hard acrylic splint typically lasts several years with care, depending on the severity of parafunction. Advise patients to brush it with a soft brush and cool water, store it dry, avoid hot water (which distorts acrylic), and bring it to reviews so wear and fit can be checked.
Sources
- Cochrane — “Occlusal splints for treating sleep bruxism (tooth grinding)” — https://www.cochrane.org/evidence/CD005514_occlusal-splints-treating-sleep-bruxism-tooth-grinding
- PubMed — “The efficacy of occlusal splints in the treatment of bruxism: A systematic review” — https://pubmed.ncbi.nlm.nih.gov/33652054/
- PMC — “Occlusal stabilization splint for patients with temporomandibular disorders: Meta-analysis of short and long term effects” — https://pmc.ncbi.nlm.nih.gov/articles/PMC5293221/
- British Dental Journal — “Oral splints for temporomandibular disorder or bruxism: a systematic review” — https://www.nature.com/articles/s41415-020-1250-2