Dental Resin · grade
Dental Resin-LT
Properties of the LT condition, compared with the other Dental Resin grades.
Pick for occlusal splints, night guards and retainers needing >30 day intraoral use, clarity and fracture resistance.
What is Dental Resin-LT?
Dental Resin-LT is Dental Resin in the LT grade — pick for occlusal splints, night guards and retainers needing >30 day intraoral use, clarity and fracture resistance. Dental Resin-LT has a yield strength of 48 MPa (6.96 ksi) and a tensile strength of 48 MPa (6.96 ksi) — weaker than 57% of polymer grades. Elongation at break is 12% and the elastic modulus is 2.2 GPa (0.319 Msi). Dental Resin-LT has a density of 1.14 g/cm³ (0.0412 lb/in³), lighter than 60% of polymer grades. Its glass-transition temperature is 78°C (172 °F). Standard is the default condition FabDigit quotes; LT is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 88/100, better than 95% of polymer grades
Limitations
- Limited formability — 5/100, worse than 95% of polymer grades
- Difficult to weld — 5/100, worse than 90% of polymer grades
- Absorbs moisture — dry before molding — 1.2%, worse than 87% of polymer grades
- Low fracture toughness — 1.1 MPa·√m (1 ksi·√in), worse than 80% of polymer grades
- Limited service temperature — 70°C (158 °F), worse than 78% of polymer grades
Dental Resin-LT properties
Typical room-temperature values for Dental Resin-LT — 11 properties are specific to this condition; the rest are grade-level values shared by every Dental Resin grade. Each bar shows where the value sits among the polymer grades in FabDigit's library — further right is higher.
Physical6
Dental Resin-LT has a density of 1.14 g/cm³ (0.0412 lb/in³), lighter than 60% of polymer grades. Its glass-transition temperature is 78°C (172 °F).
Mechanical16
Dental Resin-LT has a yield strength of 48 MPa (6.96 ksi) and a tensile strength of 48 MPa (6.96 ksi) — weaker than 57% of polymer grades. Elongation at break is 12% and the elastic modulus is 2.2 GPa (0.319 Msi).
Thermal10
Dental Resin-LT is rated for continuous service to 70°C (158 °F). It conducts heat at 0.2 W/m·K (0.116 BTU/hr·ft·°F), worse than 56% of polymer grades. Thermal expansion is 100 µm/m·K (55.6 µin/in·°F).
Electrical6
Dental Resin-LT is an electrical insulator with a dielectric strength of 15 kV/mm (381 V/mil) and a resistivity of 1×10¹³ Ω·m.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), better than 63% of polymer grades. UV resistance is fair.
Sustainability4
Producing a kilogram of Dental Resin-LT takes about 110 MJ of energy and emits 5.5 kg of CO₂ — more than 64% of polymer grades. Typical recycled content is 0%.
Manufacturability6
Dental Resin-LT's machinability is good (60/100, better than 51% of polymer grades); weldability not recommended (5/100); formability not recommended (5/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other Dental Resin grades and fills
Dental Resin is also supplied in 10 other conditions. The full side-by-side table is on the Dental Resin overview.
- StandardDefaultDefault lab-use dental photopolymer for models, trays and try-ins where no patient-contact certification is required.55 MPa tensile
- PermCrownPick for definitive single-unit crowns, inlays/onlays and veneers where 30–50 % ceramic filler gives high flexural strength and wear resistance.70 MPa tensile
- SGPick for implant drill guides that must be steam-sterilised at 121–134 °C and stay dimensionally stable.62 MPa tensile
- TempCBPick for provisional crowns, bridges and inlays worn up to ~30 days, needing tooth-shade aesthetics and wear resistance.62 MPa tensile
- Medical GradePick when documented cytotoxicity/irritation/sensitisation testing and lot traceability are required for a medical device build.60 MPa tensile
- BiocompatiblePick for appliances in direct mucosa/tissue contact (guides, splints, trays) where regulatory patient-contact certification is mandatory.58 MPa tensile
- ModelPick for working models, dies and orthodontic thermoforming models where edge sharpness and stiffness matter more than toughness.58 MPa tensile
- DentureBasePick for printed full/partial denture bases requiring ISO 20795-1 flexural performance and bonding to printed or prefabricated teeth.52 MPa tensile
- LTPick for occlusal splints, night guards and retainers needing >30 day intraoral use, clarity and fracture resistance.48 MPa tensile
- CastablePick for crown copings, partial frameworks and press patterns that must burn out cleanly with near-zero ash.26 MPa tensile
- GingivaPick for removable gingiva masks on implant models and soft-tissue simulation where elastic, tear-resistant behaviour is needed.7 MPa tensile
Working with Dental Resin-LT
Is Dental Resin easy to machine?
Trim supports and adjust with carbide/tungsten dental burs at low speed and light pressure; the cured thermoset chips and loads abrasives, so use dust extraction and avoid heat build-up that discolours the part.
Can Dental Resin be welded?
Not weldable — a thermoset; repair or join only with the same photopolymer plus flash cure, or with dental adhesive/PMMA cold-cure resin.
Can Dental Resin be formed, bent or molded?
Formed only during printing: control layer height 25–100 µm, orient to reduce cross-section per layer, wash 3–10 min in IPA (or TPM) and post-cure under 385/405 nm at 60–80 °C exactly per the datasheet — under-cure ruins biocompatibility and strength, over-cure embrittles and shrinks.
What surface finishes work on Dental Resin?
Sand 400→1500 grit wet, then pumice and dental high-gloss paste on a rag wheel; glaze or light-cure varnish improves stain resistance, and non-clear parts can be shaded with light-cure stains.
Dental Resin chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| urethane dimethacrylate (UDMA) oligomerprimary crosslinking oligomer | 20 – 60 | 40 |
| Bis-EMA / ethoxylated Bis-GMAaromatic dimethacrylate, raises modulus/Tg | 0 – 30 | 15 |
| reactive diluent monomers (TEGDMA, HEMA,viscosity control | 10 – 40 | 22 |
| silanised silica / barium glass filler0 % in clear splint/guide grades, 30–50 % in crown grades | 0 – 50 | 20 |
| photoinitiator (TPO / BAPO / camphorquin405 nm / 385 nm sensitised | 0.3 – 3 | 1.2 |
| pigments, opacifiers, stabilisers, UV blshade matching and cure-depth control | 0.1 – 3 | 1 |
Dental Resin-LT — frequently asked
What is Dental Resin-LT used for?
Dental Resin-LT is typically used for dental crowns and bridges, surgical guides, dental models and dies, splints and night guards, temporary restorations and denture bases and gingiva masks. In short: biocompatible dental SLA resin.
What is the yield strength of Dental Resin-LT?
Dental Resin-LT has a typical yield strength of 48 MPa (6.96 ksi) and a tensile strength of 48 MPa (6.96 ksi) — weaker than 57% of polymer grades. Strength varies by condition: see the 11 listed tempers.
Is Dental Resin-LT easy to machine?
Reasonably — machinability is rated good (60/100, better than 51% of polymer grades). Trim supports and adjust with carbide/tungsten dental burs at low speed and light pressure; the cured thermoset chips and loads abrasives, so use dust extraction and avoid heat build-up that discolours the part.
Can Dental Resin-LT be welded?
Not readily — weldability is rated not recommended (5/100). Not weldable — a thermoset; repair or join only with the same photopolymer plus flash cure, or with dental adhesive/PMMA cold-cure resin.
What surface finishes work on Dental Resin-LT?
Sand 400→1500 grit wet, then pumice and dental high-gloss paste on a rag wheel; glaze or light-cure varnish improves stain resistance, and non-clear parts can be shaded with light-cure stains.
Can Dental Resin-LT be formed, bent or molded?
Formed only during printing: control layer height 25–100 µm, orient to reduce cross-section per layer, wash 3–10 min in IPA (or TPM) and post-cure under 385/405 nm at 60–80 °C exactly per the datasheet — under-cure ruins biocompatibility and strength, over-cure embrittles and shrinks.
What is the maximum service temperature of Dental Resin-LT?
Dental Resin-LT is rated for continuous use to about 70°C (158 °F), and briefly to 134°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in Dental Resin-LT?
Yes — Dental Resin-LT is available for injection molding and 3D printing with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- ISO 10993-1 Biological evaluation of medical devices — ISO (2018)
- ISO 4049 Dentistry — Polymer-based restorative materials — ISO (2019)
- ISO 20795-1 Dentistry — Base polymers, Part 1: Denture base polymers — ISO (2013)
- Dental material datasheets (Surgical Guide, Dental LT Clear, Denture Base/Teeth, Permanent Crown) — Formlabs (2024)
- NextDent 3D printing resin technical data sheets — 3D Systems / NextDent (2024)
- FREEPRINT / SHERAprint dental resin datasheets — DETAX / SHERA (2023)
- Craig's Restorative Dental Materials — Elsevier (2019)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.