Why Teeth Grinding Causes Problems
Grinding and clenching exert forces on teeth far exceeding those of normal chewing. During chewing, bite forces peak briefly and the teeth contact momentarily before separating. During sleep bruxism, patients can apply sustained forces for minutes at a time with no natural endpoint signal — the result, over months and years, can be:
- Flattening and wearing of tooth surfaces
- Chipping and cracking of enamel, especially at the biting edges
- Fracture of teeth with existing restorations (fillings, crowns)
- Damage to porcelain veneers, crowns, and implant-supported prostheses
- Temporomandibular joint (TMJ) strain and disc displacement
- Jaw muscle hypertrophy (enlargement of the masseter muscles, causing a squarer facial appearance)
- Morning headaches and facial pain
An occlusal splint cannot prevent the muscle activity driving this — but by placing a protective acrylic layer between the teeth, it redirects the destructive forces to a replaceable appliance rather than irreplaceable tooth structure.
Types of Occlusal Splints
Hard stabilisation splint
The clinical standard for most bruxism and TMJ indications. Made from heat-cured hard acrylic (polymethylmethacrylate), usually 2 to 4 mm thick, covering all teeth in either the upper or lower arch.
How it works: Provides stable, even contact across all teeth when the jaw closes, allowing the jaw muscles to reach a resting position. The flat, smooth surface eliminates the cuspal interferences that guide grinding movements against natural teeth, reducing lateral grinding forces. The hard surface wears predictably and can be polished or replaced.
Indications: Moderate to severe bruxism, TMJ disorders, protection of extensive or expensive restorations, All-on-4 and implant-supported prostheses.
Lifespan: 3 to 7 years depending on grinding severity. Heavy grinders may wear through a hard splint in 1 to 2 years.
Soft (resilient) splint
Made from thermoplastic or silicone material, typically 2 to 3 mm thick. Softer and more comfortable to insert than hard acrylic.
How it works: Cushions the teeth from direct impact forces and provides some protection for tooth surfaces. However, the compressible surface does not provide the stable occlusal stop of a hard splint and may, in some patients, trigger more muscle activity rather than less.
Indications: Mild bruxism, patients who cannot tolerate hard splints initially, sport (though a sports mouthguard is preferred for contact sport).
Limitations: Does not address TMJ positioning; may increase muscle activity in some patients; wears faster than hard acrylic.
Dual-laminate splint
A hard outer layer (for durability) over a soft inner layer (for retention comfort). An attempt to combine the advantages of both types.
Indications: Patients who want the protection of a hard splint but find pure hard acrylic uncomfortable.
Limitation: Slightly thicker than either single-material option; some patients find the additional bulk uncomfortable.
Michigan (anterior guidance) splint
A specific hard acrylic design that covers all upper teeth and includes precise anterior (front tooth) contacts, with posterior teeth slightly out of contact. Designed to facilitate posterior jaw muscle relaxation through anterior guidance.
Widely used in specialist TMJ management and considered the evidence-based standard for most TMJ disorder indications.
NTI-TSS device
A very small, front-teeth-only splint that contacts only the upper front teeth when the lower jaw closes. Designed to prevent posterior tooth contact, theoretically reducing posterior muscle activity.
Evidence for NTI devices is mixed; there are concerns about accidental swallowing risk (particularly in patients who grind heavily) and limited long-term evidence compared to full-coverage hard splints. Generally recommended only in specific circumstances after discussion with the treating dentist.
Repositioning splint
A splint designed to guide the jaw into a specific position — typically used in the short-term management of acute TMJ disc displacement. Not intended for long-term wear; the goal is to reduce joint symptoms while the disc repositions. Long-term use risks permanent tooth movement.
Chemist Mouthguards vs Custom Dental Splints
Over-the-counter boil-and-bite mouthguards from pharmacies cost $20 to $80 and are tempting given the price difference from custom splints. The comparison:
| Feature | Chemist mouthguard | Custom dental splint |
|---|---|---|
| Fit accuracy | Poor — generic shape | Precise — made on study models |
| Thickness consistency | Variable — often too thin over molars | Uniform, clinically optimised |
| Bite relationship | Random | Designed to specific occlusal criteria |
| Durability | Months (if heavy grinder, weeks) | Years |
| Sleep comfort | Often poor — bulk, material taste | Designed for sleep wear |
| Clinical evidence | Limited | Substantial for custom hard splints |
| TMJ management | None | Possible with appropriate design |
For mild, occasional grinding with no tooth damage, a chemist mouthguard provides some protection and is a reasonable starting point. For documented significant bruxism, TMJ symptoms, valuable restorations, or implant-supported prostheses, a custom dental splint is the appropriate standard.
The Fabrication Process
A custom occlusal splint requires 2 dental appointments:
Appointment 1 (30–45 minutes): Impressions (moulds) of both upper and lower teeth are taken. Bite registration records how the teeth close together. These records are sent to a dental laboratory.
Appointment 2 (20–30 minutes, 1–2 weeks later): The finished splint is checked for fit, adjusted for accurate tooth contact, and polished. The patient is instructed on wear and care.
Some practices use in-house CAD/CAM technology to mill splints on the same day, reducing or eliminating the laboratory waiting period.
Wearing and Caring for a Splint
When to wear it: Most occlusal splints are prescribed for night wear (during sleep). Some patients with daytime clenching habits are advised to wear the splint during specific activities — driving, concentrating, stressful situations — where clenching occurs.
Insertion and removal: Most patients learn quickly; the splint should click in firmly and be removed by disengaging from the back teeth first.
Cleaning: Rinse under cold water after removal each morning. Brush gently with a soft toothbrush and mild soap or a non-abrasive denture cleaner. Do not use hot water (distorts acrylic). Do not soak in mouthwash long-term. Store in the provided case when not in use.
Do not: Leave the splint where pets can access it (a known hazard — dogs find them appealing). Leave it in direct sunlight. Adjust it yourself with sandpaper or instruments.
Check-ups: Bring the splint to regular dental appointments for assessment. The dentist can check for wear patterns, adjust as needed, and determine when replacement is required.
Splints and Dental Implants
Patients with dental implants — particularly full-arch implant-supported bridges (All-on-4 and similar) — are almost universally advised to wear a night guard if any bruxism is present or develops. The consequences of unprotected grinding on implant-supported prostheses are:
- Screw loosening at the bridge-to-implant connection
- Bridge fracture, particularly of acrylic and porcelain-layered zirconia bridges
- Increased stress on the implants themselves, contributing to peri-implant bone loss in some cases
For All-on-4 patients, the night guard is made over the prosthesis (it fits over the bridge, not over natural teeth) and must be updated if the prosthesis is modified or replaced. See the cleaning All-on-4 implants daily care guide and All-on-4 complications guide for the wider bruxism management context in implant patients.
Cost and Health Fund Cover
Custom occlusal splints in Townsville are billed under ADA item code 071 (for full-arch hard splints) or related codes depending on the design. Typical costs:
| Splint type | Approximate cost |
|---|---|
| Hard acrylic stabilisation splint (full arch) | $400–$800 |
| Soft or dual-laminate splint | $300–$600 |
| Complex TMJ management splint | $600–$1,200 |
Private health insurance extras cover applies in most funds under general dental or major dental benefits. Benefits typically range from $100 to $350 depending on the fund and plan level, subject to annual limits and any applicable waiting periods.
The teeth grinding night guard Townsville guide provides additional detail on provider options and insurance considerations for Townsville patients specifically.
Related Guides
Frequently asked questions
What is an occlusal splint?
An occlusal splint is a custom-made removable appliance, typically made from hard or soft acrylic, that fits over the upper or lower teeth and is worn during sleep or during stressful activities to protect the teeth and jaw joints from the effects of grinding (bruxism) and clenching. Different from a chemist mouthguard, a dental occlusal splint is precision-fabricated on models of the patient's teeth, providing accurate fit and specific bite relationship adjustment. They are also called night guards, bite guards, bite splints, bruxism splints, or stabilisation splints depending on their design purpose.
How much does an occlusal splint cost in Townsville?
A custom-made occlusal splint from a Townsville dentist typically costs $400 to $800 for a standard hard acrylic splint. Soft splints and simpler designs may cost $300 to $500. More complex splints designed for TMJ management or with specific occlusal adjustment features may cost $600 to $1,200. Over-the-counter chemist mouthguards cost $20 to $80 but are not equivalent to custom splints in terms of fit, durability, or clinical effectiveness. Private health insurance extras often provides partial cover for custom-made night guards under the general dental or major dental category, with benefits typically $100 to $300.
Do occlusal splints stop teeth grinding?
Occlusal splints do not stop the grinding behaviour itself — the muscles that drive clenching and grinding continue to contract when the splint is worn. What they do is protect the teeth and jaw joints from the destructive forces of this activity: the splint wears in place of the tooth enamel, and the smooth surface of the splint against opposing teeth reduces the lateral forces that crack and wear enamel. Many patients also report reduced muscle soreness and headaches with regular splint wear, likely because the splint positions the jaw in a more relaxed relationship. True reduction of the grinding habit itself requires management of underlying causes — stress, sleep disorders, or medication side effects.
Who needs an occlusal splint?
Occlusal splints are typically recommended for: patients with diagnosed bruxism (teeth grinding or clenching) who show signs of tooth wear; patients with temporomandibular disorder (TMD/TMJ problems) where splint therapy may reduce joint loading; patients with dental implants, porcelain crowns, or veneers where grinding would cause costly damage; patients with All-on-4 or other implant-supported prostheses, where a night guard is considered mandatory for bruxers; and patients with morning headaches, jaw soreness, or facial pain suggesting nocturnal clenching. Not everyone who clenches or grinds occasionally needs a splint — severity and evidence of damage guide the decision.
Hard vs soft night guard — which is better?
Hard acrylic splints (stabilisation splints) are the evidence-based standard for most bruxism and TMJ indications. They provide a stable, consistent bite surface, are durable, and allow the jaw muscles to fully relax against a solid surface. Soft splints are more comfortable initially but may actually increase muscle activity in some patients (the soft material triggers more biting reflex) and wear faster. Current clinical guidelines generally favour hard splints for TMJ disorders and moderate to severe bruxism. Soft splints have a role for patients who cannot tolerate hard splints and for mild or infrequent grinding. Dual-laminate splints (hard outer, soft inner) combine durability with comfort and are a reasonable compromise.
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