ANSWERS

What is the best night guard for bruxism?

For moderate to severe bruxism, a hard acrylic full-coverage occlusal splint is the clinical standard. Heat-cured PMMA at 2.5 to 3.0 mm occlusal thickness resists fracture under sustained clenching loads that destroy boil-and-bite and dual-laminate guards within months.

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THE FULL PICTURE

Why it works this way

The short version: hard acrylic, full coverage, digitally fit

Ask ten lab technicians and you get one answer. Heat-cured PMMA, 2.5 to 3.0 mm at the occlusal table, full arch coverage, balanced occlusion verified on articulator or in CAD. That is the appliance that survives a real bruxer. The American Academy of Sleep Medicine 2023 practice parameters classify hard acrylic occlusal splints as the first-line oral appliance for sleep bruxism with documented tooth wear, and a 2022 systematic review in the Journal of Oral Rehabilitation (Manfredini et al.) found hard stabilization splints reduced masseter EMG activity 39% more than soft guards across pooled trials.

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How long should a properly made night guard last?

A heat-cured PMMA hard acrylic guard, fabricated full-arch with balanced occlusion, should last a moderate bruxer 3 to 5 years and a severe bruxer 2 to 3 years before perforation or significant occlusal wear warrants replacement. Soft and dual-laminate guards typically fail within 6 to 18 months on the same patient. The honest answer at intake: if the dentist sees wear facets on a 14-month-old appliance, the material spec was wrong, not the patient.

Can a night guard make bruxism worse?

Yes, when the wrong appliance is prescribed. Soft EVA guards can increase masseter activity in some patients because the resilient material invites clenching. Partial-coverage anterior-only appliances (NTI-style) worn long-term have been associated with posterior tooth supraeruption and occlusal changes. A properly designed full-arch hard acrylic splint with even bilateral contacts and canine guidance does not worsen bruxism and is the appliance type with the strongest evidence base for protecting dentition from grinding loads.

What is the difference between a night guard and an occlusal splint?

Clinically, they describe the same appliance category, but the terminology signals intent. Night guard is the consumer-facing term and often implies a softer, simpler appliance. Occlusal splint is the clinical term and implies a precisely designed hard acrylic device with defined occlusal contacts, intended for diagnostic use, joint stabilization, or bruxism protection. When a lab quotes an occlusal splint, expect heat-cured PMMA, full arch coverage, articulator-verified occlusion, and a price reflecting the design work.

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