Soft Night Guard — Custom Occlusal Protection for Your Practice

Our night guards fall into three categories:

• Soft guards — EVA or similar elastomer materials; typically 2–3 mm thickness; suited for light to moderate bruxism where cushioning and patient tolerance are the primary concerns
• Hard guards — Rigid acrylic; flat occlusal plane; designed for cases requiring muscle relaxation, TMD management, or stable occlusal adjustment
• Dual-laminate guards — Soft inner layer + hard outer shell; combines comfort with durability; often chosen when a soft guard alone wears through too quickly

The soft designation refers to material hardness tier, not a single material standard. EVA is the most common; acrylic copolymers and soft polyethylene variants are also used. Each material batch carries manufacturer certificates and biocompatibility documentation per ISO requirements; we can supply these on request for compliance verification.

When Dentists Choose a Soft Guard — And When They Don't

Soft night guards are frequently prescribed for patients reporting nighttime clenching, early-stage grinding, or those who cannot tolerate a rigid appliance. The soft surface reduces initial discomfort and often improves early compliance.

However, wearing a guard does not stop the grinding behavior itself. Soft guards protect tooth structure from wear and reduce transmission of occlusal forces to the TMJ, but they do not eliminate the underlying bruxism. In fact, a 2014 sleep-laboratory study of 14 bruxers found that 43% actually increased jaw-muscle activity while wearing an appliance, and concluded that occlusal appliances have no significant feedback inhibition on jaw-muscle activity during sleep.

A soft night guard for teeth grinding is not automatically the right choice for everyone. The comparative evidence is mixed rather than settled: one head-to-head EMG study found that all splint types lowered muscle activity but the reduction was most pronounced with a hard splint, while a separate 2024 meta-analysis found soft and hard appliances did not differ in their effect on muscle activity or bite force. The choice should be guided by:

• Severity of grinding: Moderate to severe bruxers often wear through soft material quickly; hard or dual-laminate may be more cost-effective over time
• TMD symptoms: If the primary goal is muscle relaxation or occlusal repositioning, a rigid flat-plane splint is generally preferred
• Patient tolerance: Soft guards feel less intrusive initially; this can improve adherence in the first 4–6 weeks
• Lifespan expectations: Soft materials are porous, absorb fluids, and degrade faster than hard acrylic; replacement is often needed within 6–12 months depending on wear severity

We manufacture both soft and hard guards because the right appliance depends on clinical context, not a universal hierarchy. When you send a case, specifying patient symptoms, grinding severity, and whether TMD management is a goal helps us confirm the prescribed type matches the clinical picture.

Custom Fit = Scan or Impression + Lab Adjustment

All guards we produce are custom-made to a prescription. "Custom" means two things in practice:

1. Initial fabrication is based on the patient's dentition captured in your scan or impression
2. In-office adjustment at delivery is expected — no lab-fabricated guard (soft or hard) seats perfectly without chairside trimming of margins, relieving pressure points, or adjusting occlusal contacts

Soft guards in particular require margin adjustment because the material is flexible and the gingival contour captured in the scan may differ slightly from tissue position at delivery. Dentists should plan 10–15 minutes for try-in and adjustment.

Digital workflow reduces remakes, but it does not eliminate adjustment. Scans capture hard-tissue geometry accurately, but soft-tissue drape, saliva pooling, and patient movement during scanning can introduce small discrepancies. We check every scan for edge clarity, holes, and stitching errors before design; if the scan is unusable, we notify you within one business day and request a rescan. This front-end verification step reduces remakes caused by data quality, but chairside fit refinement remains part of standard delivery.

Materials, Thickness, and What the Evidence Actually Says

Common Thickness Options

• 1.5 mm — Thinnest option; minimizes bulk; used when occlusal space is very limited or patient cannot tolerate thicker material
• 2 mm — Most common; balances protection and comfort for light to moderate teeth grinding
• 3 mm — Thicker cushion; chosen for heavier grinders or when additional soft-tissue protection is needed

Thickness alone does not fully predict clinical success. A 2023 randomized trial of 115 patients found that both 2 mm and 3 mm soft splints reduced maximum bite force and improved sleep quality over two months; it did not identify a clear advantage for one soft thickness over the other, while material type did influence bite force (the 3 mm hard splint produced the highest values). In practice, thickness selection is often driven by occlusal clearance and patient tolerance rather than a proven ranking.

Material Properties and Replacement Signals

Soft night guard materials are porous. They absorb saliva, oral fluids, and — over time — bacteria. This is why soft guards degrade faster than hard acrylic. Replacement should be triggered by observable signs, not a fixed time interval:

• Visible wear-through (holes, thinning)
• Persistent odor despite cleaning
• Loss of resilience (material no longer springs back)
• Visible discoloration or surface roughness

Some patients replace a soft guard every 6 months; others may need replacement in 3 months if grinding is severe. We do not guarantee a specific lifespan because wear rate depends on patient behavior, not manufacturing quality.

Cleaning Instructions We Recommend

There is conflicting guidance in published and commercial sources about cleaning temperature:

• Warm water recommendations appear in some manufacturer instructions, presumably to aid detergent action
• Cold water recommendations appear in others, citing concern that heat accelerates material degradation

What We Need From You to Start a Case

Digital Cases (Preferred)

Send scan files (STL, PLY, OBJ, or DCM) via:

• Email: [LAB EMAIL]
• 3Shape Communicate, Medit Link, iTero, or other connected platforms we support
• WeTransfer or similar file-sharing links

Required scans:

• Upper and lower arches (full arch, extending to second molars)
• Opposing arch
• Bite registration (centric occlusion)

Soft-tissue clarity matters. If the scan shows gingival margins obscured by saliva or tissue drape, we will request a rescan. Use retraction if needed for subgingival margin cases, though for night guards the margin is typically supra-gingival.

Impression Cases

Mail PVS or polyether impressions (not alginate — alginate degrades in transit) to our Shenzhen facility. We provide prepaid shipping labels for established accounts. Mark the package with case ID and expected material/thickness.

Turnaround: Typical turnaround for night guards varies by complexity and workflow:

• Digital cases with straightforward design: often 2–3 business days production after design confirmation
• Complex implant or full-arch cases: typically 5–7 business days
• Remakes: prioritized and expedited, usually 3–5 business days

Turnaround is counted in working days and begins when we receive complete, usable data or impressions. Design approval wait time, missing-information delays, and inbound shipping (for impression cases) are not included. International shipping to US/EU adds 3–5 days; customs clearance is outside our control and not included in our turnaround commitment.

Manufacturing Process — What Happens After You Send the Case

Design and Approval

1. Data check: We verify scan quality (no holes, clean margins, valid bite). If unusable, you're notified same day.
2. CAD design: Technician designs the guard to prescribed thickness, adds retention undercuts, and defines margin extension per your instructions (or our default if unspecified).
3. Preview (optional): We can send a screenshot or STL for approval before printing. Most practices waive this step to save a day.

Fabrication

• 3D printing for soft guards: We print the guard on dental-certified resin printers, post-cure under UV, and trim/polish margins.
• Thermoforming (alternative method for some materials): Heat-press EVA sheet over a 3D-printed model; trim and polish.

Each method produces a dimensionally accurate guard; the choice depends on material type and batch logistics.

Quality Control

Every guard passes three checkpoints:

1. Post-print inspection: Dimensional check against design file; no print artifacts or incomplete curing
2. Fit verification on model: Guard seats fully on the printed or physical model without rocking
3. Final QC: Margins smooth, no sharp edges, material integrity confirmed

QC pass rate: Our internal first-time QC pass rate is approximately 95%. Cases that fail are reworked before shipping. This rate reflects production quality, not clinical fit (which requires chairside adjustment).

Cooperation Process — From Trial Case to Ongoing Partnership

New Practices: Start With a Trial

We accept single-case trial orders. Here's the typical path:

1. Initial contact: Email or inquiry form. We'll ask about your typical case volume, preferred turnaround, and whether you use digital or impression workflow.
2. Test case: Send one soft guard case (digital preferred). No commitment required.
3. Feedback: After you deliver the guard, let us know: Did it seat? Were margins acceptable? Any design changes for next time?

Most practices place a second order within 2–3 weeks if the first case meets expectations.

Ongoing Accounts

For practices or labs sending recurring cases:

• Dedicated account manager: Assigned after your third case. Handles technical questions, rush requests, and design preferences.
• Batched shipping: If you send multiple cases per week, we can batch ship once or twice weekly to reduce per-case freight cost.
• Design templates: We save your preferred margin extension, thickness defaults, and material choices so repeat orders require minimal instruction.

Rush Cases and Timing

Rush service: Available for urgent cases (patient appointment already scheduled, etc.). Contact your account manager. Rush handling may reduce turnaround by 1–2 days depending on current production load.

What's NOT included in turnaround time:

• Inbound shipping (for impression cases)
• Time waiting for design approval (if you request preview)
• Customs clearance delays (rare but outside our control)
• Weekends and Chinese public holidays (we do not produce or ship; turnaround clock pauses)

If a case is delayed for any reason (equipment downtime, material backorder, holiday closures), we notify you immediately and provide a revised ship date.

Remakes and Adjustments

We remake at no charge if:

• Margin fit is incorrect due to design or fabrication error
• Material defect (curing failure, embedded contaminant)
• Thickness does not match prescription

We charge for remakes if:

• Patient's dentition has changed (new crown, extraction, etc.) since the original scan
• Dentist requests material or thickness change after delivery
• Original scan was unusable and we flagged it, but you instructed us to "do our best" anyway

Remake turnaround: Expedited, typically 3–5 business days. You do not need to return the original guard for data-file cases; for impression cases, return is helpful but not mandatory.

Compliance, Traceability, and Documentation We Provide

Regulatory Status

• FDA: Istar is registered with the FDA as a custom dental device manufacturer. Our facility registration and device listings are verifiable in the FDA FURLS database.
• EU MDR: We hold custom-device notification under MDR Annex XIII for Class IIa custom dental appliances. An authorized EU representative is in place.
• ISO 13485: Certified for quality management systems specific to medical device manufacturing.

What We Can Supply Per Case

• Material certificates: Brand, batch number, biocompatibility certificates (ISO standards)
• Custom declaration (EU cases): States the device is patient-specific, manufactured per prescription, and meets MDR custom-device requirements
• Traceability record: Each case has a unique ID linking to the technician, material batch, production parameters, and QC results. Retained for 3 months standard; longer retention available on request.

Privacy and Data Handling

We do not require patient names. Many practices use internal case numbers instead. All scan files and case records are encrypted in transit and at rest. Access is limited to production and quality staff with signed confidentiality agreements.

Common Questions From Referring Practices

Q: Can you make a thicker soft guard (4+ mm)? A: Yes, but occlusal clearance and material behavior become concerns. Thick soft material can deform under heavy bite force, changing VDO unpredictably. We recommend consulting with us before prescribing >3.5 mm.

Q: What if the scan shows inadequate occlusal clearance? A: We'll notify you. Options: reduce thickness, switch to a thinner hard guard, or request the patient return for tooth reduction/equilibration before resubmitting the case.

Q: Do you make guards for implant patients? A: Yes. A 2025 review of bruxism in implant-supported rehabilitations reports that bruxing patients have a 2.2–4.7× higher implant failure risk than non-bruxers, and that occlusal splints can reduce stress concentration substantially. We design the guard to distribute force evenly and avoid point-loading the implant crown. Flag the implant locations in the case notes.

Q: How should I instruct the patient on wear schedule? A: Evidence supports nighttime-only wear for bruxism appliances. Daytime wear is rarely indicated unless daytime clenching is the primary concern. Continuous 24-hour wear is not recommended for soft guards (tissue irritation, hygiene concerns).

Q: Can a soft guard cause TMJ problems? A: A poorly designed or excessively thick guard can alter occlusion and potentially worsen TMD symptoms. This is why we ask for bite records and check for balanced contacts during QC. If a patient develops new TMJ pain after guard delivery, remove the appliance and re-evaluate occlusion.

Evidence Base — What the Research Actually Shows

Key Findings From Systematic Reviews and RCTs

• Splints do not stop bruxism, but may limit wear: Cochrane 2007 found insufficient evidence that occlusal splints effectively treat sleep bruxism, though they may reduce tooth wear.
• Soft vs. hard — no clear winner: Cochrane 2024 reviewed 57 RCTs (2,846 participants) on occlusal interventions for TMD and found insufficient evidence to declare any type superior, with very low certainty across all outcomes.
• Custom vs. over-the-counter: A 2020 RCT found patients had difficulty fabricating OTC splints to clinically acceptable standards, and the OTC group had significantly more nighttime grinding bursts — though compliance and most other outcomes were similar. The authors recommend active dentist oversight of self-fabricated appliances.
• Thickness and material: the 2023 randomized trial cited above under Materials, Thickness found that material type influenced bite force, while thickness alone did not clearly separate 2 mm from 3 mm soft splints.