I. Scope and Normative References
This specification applies to dental 3D printers used in dental restoration, orthodontics, and implantology, covering basic requirements, performance indicators, safety and electromagnetic compatibility, environmental adaptability, noise and reliability, as well as marking, packaging, transportation, and storage. Normative references include, but are not limited to: GB/T 191 Packaging and Storage Pictorial Markings, GB/T 4208 Degrees of Protection Provided by Enclosures (IP Code), GB/T 9254.1 and GB/T 9254.2 Electromagnetic Compatibility of Information Technology Equipment-Emissions and Immunity, GB/T 17626 Electromagnetic Compatibility Testing and Measurement Techniques, GB/T 4857.17 Basic Tests for Transport Packaging-Part 17, GB/T 6544 Corrugated Cardboard, and GB/T 13384 General Technical Conditions for Packaging of Electromechanical Products. These documents collectively constitute the basis for the design, manufacture, inspection, and delivery of the equipment.
II. Basic Requirements
The equipment should meet basic requirements regarding appearance and structure, material compatibility, and data interfaces: The appearance should be free of scratches, deformation, and cracks, and the markings should be clear; the structure should adopt a modular design, with an ergonomic layout, easy-to-maintain inspection ports and accessibility to key components, and the ability to interface with dental scanners, model polishing machines, etc.; in terms of materials, it should be compatible with photocurable resins (such as model, restoration, and biocompatible resins) and thermoplastic filaments (such as PLA, PEEK), and the key dimensional deviation of printing the same standard model with different batches of materials should be controlled within ±0.2 mm; the data interface should at least have USB 2.0 or higher, 10/100/1000 Mbps Ethernet, and 2.4/5 GHz Wi-Fi, with a reasonable layout and clear markings.
III. Performance Requirements The performance specifications should cover core indicators such as printing accuracy, speed, model/slicing processing, environmental adaptability, and reliability: For printing accuracy, X/Y axis positioning accuracy ≤ ±0.05 mm, repeatability ≤ ±0.03 mm; Z axis positioning accuracy ≤ ±0.03 mm, repeatability ≤ ±0.02 mm; standard anatomical model dimensional deviation ≤ ±0.1 mm; complex restorations (such as implant guides, multi-unit bridges) dimensional deviation ≤ ±0.08 mm; surface roughness Ra ≤ 0.8 μm. For printing speed, no less than 10–15 mm³/h when layer thickness is 0.05–0.10 mm; no less than 3–6 mm³/h in high-precision mode (layer thickness 0.02–0.05 mm); and no less than 20–30 mm³/h in fast mode. Model processing should support automatic/manual repair (damaged surfaces, holes, overlapping surfaces, etc.) and platform positioning/layout; slicing should support layer thickness accuracy to 0.01 mm and layer path/support preview. Environmental adaptability covers high-temperature storage (55±2 ℃/8 h), low-temperature storage (-10±3 ℃/8 h), constant humidity and heat (40±2 ℃/93±3 %RH/8 h), and vibration (10–55 Hz/0.35 mm/10 cycles in each of the three axes/45 min per axis). Drop test compliance for transport packaging shall comply with GB/T 4857.17: 1000 mm drop height for weight M≤10 kg, 800 mm for 10<M≤20 kg, and 600 mm for 20<M≤30 kg. Electromagnetic compatibility shall meet GB/T 9254.1/2 (Class B emission, immunity qualified) and GB/T 17626 series (electrostatic discharge, radio frequency radiation and conducted immunity level 2); noise level at 2 m ≤60 dB(A); reliability MTBF ≥400 h.
IV. Safety and Environmental Requirements
Safety provisions include three aspects: materials, electrical, and mechanical. Regarding material safety, dental materials should be biocompatible, and the upper limit of residual monomer content after curing should be clearly defined for UV-cured resins. Regarding electrical safety, the grounding path impedance should be <0.1 Ω, the normal operating leakage current ≤0.5 mA, and it should withstand a 1500 V/50 Hz/1 min withstand voltage test without breakdown/flashover. Power control should be equipped with easily accessible switches, interlocking/disconnect locking/automatic disconnection, and anti-accidental start measures. Regarding mechanical safety, moving parts should be equipped with protective devices and a red mushroom-shaped emergency stop button. Regarding environmental requirements, packaging should prioritize the use of recyclable materials (such as corrugated cardboard GB/T 6544), limiting lead to ≤1000 ppm, mercury to ≤1000 ppm, cadmium to ≤100 ppm, and hexavalent chromium to ≤1000 ppm. Products should preferably adopt energy-saving technologies and provide energy efficiency labels, and life cycle assessments (LCA) are encouraged. Waste products should provide disposal guidelines and support standardized recycling.
V. Marking, Packaging, Transportation and Storage
The equipment should be clearly marked with the product name, model, serial number, power supply and power consumption, protection level, interface type, and applicable standard number; packaging should comply with GB/T 191 and GB/T 13384, using corrugated cardboard conforming to GB/T 6544 and recyclable/degradable cushioning materials, and meeting drop resistance requirements; during transportation, avoid rain, impact and compression, and place and secure the equipment according to the packaging markings; the storage environment should be dry, ventilated, and free of corrosive gases, avoiding high temperatures and direct sunlight. The recommended storage period is no more than 12 months; after this period, the appearance, accuracy, and function should be re-inspected before putting the equipment into use.
