Biocompatible Hard Splint Resin for DLP and LCD Printers (500ml/500gram)

3D Print Durable Occlusal Splints and Night Guards 

If your patients grind their teeth at night, clench during the day, or suffer from jaw pain caused by TMJ disorders, a well-fitting hard occlusal splint is one of the most effective treatments available. This biocompatible hard splint resin lets you fabricate those splints digitally — directly from a scan and CAD file — using your DLP or monochrome LCD printer. No more sending impressions to an outside lab and waiting days. You design it, you print it, you deliver it.

The "hard" in hard splint matters. Unlike flexible night guard materials, a hard acrylic-style splint provides a rigid, stable occlusal platform that allows the jaw muscles to fully relax and prevents the uneven tooth wear that bruxism causes over time. This resin is formulated to deliver exactly that: rigid, wear-resistant, precisely fitting appliances that hold their shape through months of nightly use.

⚠️ Critical Information Before Clinical Use

• ⚠️ This appliance is worn inside the patient's mouth. Before delivering any 3D-printed splint to a patient, confirm that this material's biocompatibility has been validated according to ISO 10993 or equivalent standards applicable in your jurisdiction. Dental professionals bear full clinical and regulatory responsibility for patient-contact materials. Request the current Safety Data Sheet (SDS) and biocompatibility documentation from your supplier before clinical use.
• Post-curing is mandatory — not optional. Uncured or under-cured resin retains free monomers that are toxic to oral tissues. A splint that is not fully post-cured is not biocompatible, regardless of what the resin is rated to be. Full post-cure per the manufacturer's protocol is required before every patient delivery. No exceptions.
• UV wavelength: Compatible with DLP and monochrome LCD printers in the 385–405 nm range. Confirm your printer's light source wavelength before purchasing.
• Processing temperature: Print and handle resin at room temperature, between 20–30°C (68–86°F). Cold resin increases viscosity and leads to poor layer adhesion and failed builds.
• PPE required during fabrication: Wear nitrile gloves and safety glasses when handling uncured resin. Uncured photopolymer is a skin and eye irritant. Work in a well-ventilated space.
• Shake before every use: Mix the resin thoroughly before pouring into the vat. Settled pigment and photoinitiators cause inconsistent curing and color variation across the build plate.
• Storage: Store sealed, below 25°C (77°F), away from direct light. Exposure to ambient UV light will begin curing the resin in the bottle, reducing shelf life and print quality.

What Is a Hard Occlusal Splint and Why Does the Resin Matter?

Think of a hard splint like a custom-fitted mouthguard made of rigid plastic — but much more precise. It sits over the upper or lower teeth and creates a smooth, flat surface that the opposing teeth bite against. This does two things: it stops the teeth from grinding directly against each other, and it gives the jaw muscles a neutral position to rest in, which reduces tension and pain.

The reason the resin matters is simple: the splint needs to survive months of nightly grinding pressure without cracking, warping, or developing rough spots that irritate the gum tissue. A resin that is too brittle shatters. A resin that is too soft develops wear grooves. This hard splint resin is formulated to hit the right balance — rigid enough to protect teeth, tough enough to last, and smooth enough to stay comfortable.

Key Material Properties

• High rigidity — the foundation of effective splint therapy: The cured resin provides a hard, stable occlusal surface that prevents uneven wear and distributes bite forces evenly across the arch, which is exactly what's needed for bruxism and TMD management.
• Excellent wear resistance: Formulated to withstand repeated grinding and clenching cycles without developing deep wear grooves that would compromise occlusal balance and patient comfort over time.
• High dimensional accuracy: Prints with tight tolerances that translate to accurate fit on articulated models — reducing chairside adjustment time and delivering a better first-fit for the patient.
• Polishable surface: The cured material accepts standard dental polishing protocols, allowing the lab or clinician to achieve a smooth, glossy finish that is both comfortable against soft tissue and easy for the patient to keep clean.
• Biocompatible formulation: Designed for extended intraoral contact — the type of exposure a nightly splint sees over months of use. Full post-curing per protocol is required to activate these properties.
• In-house production efficiency: Print multiple splints per build, reducing turnaround from days to hours and eliminating lab outsourcing costs for this appliance type.

Clinical Applications

• Hard occlusal splints for bruxism (nighttime teeth grinding)
• Stabilization splints for temporomandibular joint (TMJ) disorders
• Michigan-style and flat-plane occlusal splints
• Hard night guards for clenching and daytime parafunctional habits
• Anterior deprogrammers and Lucia jigs
• Orthopedic repositioning appliances

Technical Specifications

Recommended Print Settings

Hard splint resins require accurate exposure calibration to achieve both dimensional precision and a polishable surface. Over-exposure creates dimensional blooming that affects splint fit; under-exposure creates a weak, brittle appliance. Always run a test calibration print and check fit on an articulated model before committing to a patient build.

Post-Processing Instructions

1. Remove from build plate carefully using a metal spatula. Support the appliance as it releases to avoid flexing thin sections.
2. Wash in IPA or 95% ethanol. Use an ultrasonic bath for best results: two sequential washes of approximately 3–5 minutes each in fresh solvent. Agitate gently. Avoid washing longer than 10 minutes total — prolonged IPA exposure can create micro-cracks in rigid resins.
3. Air dry completely — minimum 5 minutes — before post-curing. Residual IPA on the surface during UV exposure interferes with the final surface finish.
4. Post-cure under UV per the manufacturer's specified time and temperature. ⚠️ This step is mandatory for biocompatibility — it removes residual unpolymerized monomers that would otherwise be in contact with oral tissue. Cure completely on all surfaces. Rotating turntable curing stations are recommended.
5. Remove supports and finish the occlusal surface with dental burs and polishing wheels. Sand progressively from coarse to fine grit, then polish with a pumice-based compound to achieve the smooth, glossy finish required for patient comfort and easy home cleaning.
6. Verify fit on model before patient delivery. Check occlusal contacts with articulating paper and adjust as needed.

Who Is This Resin For?

This hard splint resin is the right choice if:

• You are a dental clinician or lab technician producing hard occlusal splints, night guards, or stabilization appliances for patients with bruxism, clenching, or TMD — and you want to bring that production in-house digitally.
• You are currently outsourcing splint fabrication to an outside lab and want to reduce turnaround time and cost by printing directly from your own DLP or LCD printer.
• You own a 385–405 nm DLP or monochrome LCD printer — including printers like Elegoo Saturn, Anycubic Photon Mono, Phrozen Sonic, SprintRay, Asiga, or similar open-platform dental printers.
• You need a 500g / 500ml format — ideal for clinics and small labs with moderate splint volume, or for testing a new resin before committing to larger quantities.

This resin is NOT the right choice if you need a soft or semi-flexible night guard material for patients who cannot tolerate rigid appliances, or if you need a resin with specific flexibility for repositioning or functional appliances. For surgical applications, see our Dental Surgical Resin collection.