3D Print Comfortable Night Guards, TMJ Splints & Oral Appliances
Not every patient can tolerate a hard acrylic night guard. For patients with mild bruxism, TMJ sensitivity, or those who are new to wearing oral appliances and need time to adjust, a soft flexible splint is often the better clinical choice — it feels more like a cushion than a mouthguard, seats without discomfort, and promotes patient compliance because patients actually keep wearing it.
This flexible soft splint resin lets you print those appliances directly from your DLP or LCD printer. No outsourcing, no waiting. Design the splint from a digital scan, print it, deliver it — with a custom fit that a boil-and-bite appliance from a pharmacy can never match.
⚠️ Critical Information Before Clinical Use
-
⚠️ This appliance is worn inside the patient's mouth for extended periods. Before delivering any 3D-printed soft splint to a patient, confirm that this material's biocompatibility has been validated per ISO 10993 or equivalent standards applicable in your jurisdiction. Request the current Safety Data Sheet (SDS) and biocompatibility documentation from your supplier. Dental professionals bear full clinical and regulatory responsibility for all patient-contact materials.
-
⚠️ Clinical note — soft splints are not for all bruxism cases. Research indicates that for patients with severe bruxism (heavy grinding), soft flexible splints may actually increase jaw muscle activity compared to hard acrylic splints — some patients clench harder against a soft surface. For severe bruxers, a hard splint is typically the preferred clinical choice. Consult clinical guidelines and assess each patient individually before selecting soft vs. hard material.
-
Post-curing is mandatory for biocompatibility. Uncured or under-cured resin retains unpolymerized monomers that are irritating to oral tissue. Full UV post-curing per the manufacturer's protocol is required before every patient delivery. An appliance that is not fully post-cured is not safe for intraoral use — regardless of the resin's biocompatibility rating.
-
⚠️ Do not over-cure flexible resins. Unlike rigid splint resins, flexible resins lose their softness and elasticity when exposed to excessive UV. Over-curing makes the appliance stiff — defeating its primary clinical purpose and potentially causing patient discomfort. Follow the manufacturer's post-cure time precisely.
-
UV wavelength: Compatible with DLP and monochrome LCD printers in the 385–405 nm range. Confirm your printer's light source before purchasing.
-
Processing temperature: Print at 20–30°C (68–86°F). Cold resin increases viscosity, causing adhesion failures and inconsistent layer properties.
-
PPE required during fabrication: Wear nitrile gloves and safety glasses when handling uncured resin. Work in a ventilated area.
-
Shake before every use: Mix thoroughly before pouring into the vat to ensure consistent pigment distribution and curing behavior.
Hard Splint vs. Soft Splint — Which One Does Your Patient Need?
Think of it like two types of shoe insoles: one is rigid orthopedic support, the other is memory foam cushioning. Both protect your foot, but in different ways and for different situations. Dental splints work the same way.
| Property |
Hard Splint Resin |
This Soft Splint Resin |
| Feel in the mouth |
Rigid — like a hard plastic shell |
Flexible — cushioned, adapts under pressure |
| Best for |
Severe bruxism, heavy grinders, TMD stabilization |
Mild bruxism, TMJ sensitivity, new wearers, sensitive patients |
| Patient comfort |
Adjustment period required — feels foreign at first |
Faster adjustment — softer feel improves initial compliance |
| Muscle activity |
Reduces jaw muscle activity in most patients |
⚠️ May increase muscle activity in severe bruxers — assess case-by-case |
| Durability |
Longer lifespan under heavy grinding forces |
Shorter lifespan in severe grinding cases — consider for moderate use |
| Cushioning |
None — occlusal forces distribute mechanically |
Yes — absorbs and distributes impact forces like a buffer |
| Polishable surface |
Yes — high gloss finish achievable |
Yes — soft resins can be polished to a smooth, comfortable finish |
For a hard splint option, see our Dental Resin collection.
Key Material Properties
-
Controlled flexibility — the foundation of patient comfort: The cured resin has enough flex to absorb occlusal impact forces and conform slightly under bite pressure — providing the cushioning sensation that makes soft splints tolerable for patients who resist wearing rigid appliances.
-
Dimensional accuracy for precise fit: Despite being flexible, this resin prints with the tight tolerances required for a well-fitting oral appliance. A custom-printed soft splint fits the patient's arch precisely — no boil-and-bite approximations, no bulky over-thickness to compensate for inaccuracy.
-
Biocompatible formulation: Designed for extended intraoral contact — the kind of exposure a nightly splint sees across months of use. Full post-curing per protocol is required to activate these properties.
-
Cushioning and impact absorption: The flexible matrix distributes bite forces across the occlusal surface rather than transmitting them rigidly — reducing pressure on the TMJ and reducing fatigue in the masseter and temporalis muscles during sleep.
-
Polishable surface: The cured appliance accepts dental polishing to a smooth, comfortable finish — reducing soft tissue irritation from the lingual and buccal flanges during wear.
-
Patient compliance advantage: Patients who have abandoned hard night guards due to discomfort are significantly more likely to wear a soft appliance consistently — which makes it clinically effective rather than sitting in a drawer.
Clinical Applications
- Soft occlusal night guards for mild bruxism and clenching
- TMJ disorder cushioning splints and deprogrammers
- Soft repositioning appliances for initial TMJ therapy
- Snoring and sleep apnea retention appliances (as base material)
- Bleaching trays and whitening appliances
- Orthodontic retainers requiring flexible fit
- Sports mouthguards for patients requiring custom-fit protection
- Pediatric occlusal appliances where rigid materials are poorly tolerated
Technical Specifications
| Property |
Value |
| Compatible Technologies |
DLP, Monochrome LCD (MSLA) |
| UV Wavelength Range |
385–405 nm |
| Net Weight / Volume |
500 g / 500 ml |
| Resin Type |
Flexible — soft occlusal appliance material |
| Intraoral Use |
Yes — verify biocompatibility documentation before patient delivery |
| Processing Temperature |
20–30°C (68–86°F) |
| Wash Method |
IPA 95% or ethanol — gentle wash cycles |
| Post-Cure Required |
Yes — mandatory; do not over-cure (reduces flexibility) |
| Storage Temperature |
Below 25°C (77°F), away from light and heat sources |
Recommended Print Settings
Flexible splint resins require careful exposure calibration. The most common error is over-exposure — which produces an appliance that is too rigid and defeats the purpose of using a soft material. Always print a test piece first, verify flexibility by hand before printing the patient appliance, and follow the manufacturer's validated post-cure time precisely.
| Setting |
Recommended Range |
| UV Wavelength |
385–405 nm |
| Layer Height |
0.05 mm – 0.10 mm |
| Normal Layer Exposure |
2–5 s — start low; over-exposure reduces flexibility |
| Bottom Layer Exposure |
20–40 s |
| Number of Bottom Layers |
3–5 |
| Lift Speed |
Slow — flexible resins are more prone to delamination at high lift speeds |
| Splint Orientation |
Angled 30–45° — reduces peel forces on thin flange sections |
| Support Strategy |
Light supports on lingual/palatal surface only — keep occlusal surface support-free |
| Anti-Aliasing |
Enabled — improves surface smoothness on curved arch contours |
Post-Processing Instructions
-
Remove from build plate carefully. Support the appliance during removal — flexible resins can deform under uneven spatula pressure before post-cure.
-
Remove supports immediately while the part is still in the pre-cured state — supports break off more cleanly before final UV hardening. Work carefully around the flanges and occlusal surface.
-
Wash in IPA 95% or ethanol — gentle immersion of 3–5 minutes. Do not use extended or aggressive ultrasonic cycles on flexible resins, as prolonged solvent contact can affect surface properties. Use fresh solvent for the final rinse.
-
Air dry completely before post-curing. Residual IPA on the surface during UV exposure affects the final surface finish and may create tackiness.
-
Post-cure under UV — follow time precisely. ⚠️ Under-curing leaves cytotoxic monomers on the surface. Over-curing makes the appliance rigid. Use the manufacturer's validated post-cure time and check flexibility by hand before delivering to the patient — the appliance should flex noticeably under moderate finger pressure.
-
Polish with soft polishing wheels using standard dental polishing protocols. Flexible materials respond differently than rigid acrylic — use lower RPM and avoid heat buildup, which can temporarily distort the appliance shape.
-
Verify fit on articulated model and check for comfort before patient delivery. The appliance should seat fully with light pressure and release cleanly.
Who Is This Resin For?
This flexible soft splint resin is the right choice if:
- You are a dentist or dental lab technician producing soft night guards, TMJ cushioning splints, or flexible oral appliances for patients who cannot comfortably tolerate hard rigid splints — or for mild bruxism cases where cushioning is the primary clinical goal.
- Your patients have TMJ sensitivity, mild grinding habits, or low bruxism intensity — soft splints are clinically indicated for these profiles and produce better patient compliance than rigid alternatives.
- You have patients who have previously abandoned hard night guards due to discomfort during the adjustment period — a soft appliance significantly lowers the adaptation threshold.
- You own a 385–405 nm DLP or monochrome LCD printer and want to bring soft appliance production in-house — reducing turnaround time from lab outsourcing to same-day or next-day delivery.
- You need a 500g / 500ml format — ideal for clinics with moderate appliance volume or for testing the resin before committing to larger quantities.
This resin is NOT the right choice if your patient has severe bruxism with heavy grinding forces — in those cases, a hard splint resin provides better protection, longer appliance life, and more effective reduction of jaw muscle activity. For hard splint applications, see our Dental Resin collection.
