# Dental laser sintering
Laser sintering, also known as SLS (selective laser sintering), makes it possible to print even highly complex parts. This powder-based3D printing technology uses a laser to fuse layers of material into a final part. A laser patterns each layer of the 3D design on a bed of powder. Each time a layer is completed, the manufacturing platform lowers and another layer is created on top of the previous one. This process continues until each layer has been built up and the part is complete.
Parts manufactured by laser sintering are solid, and their strength is fully comparable to that of parts manufactured by casting or machining.
The reliability of laser sintering is well established. Advantages include
- High accuracy
- High reproducibility
- Fast production times and (almost) no time lost between design and production
- Feasibility with no shape limits
- Respect for the environment through optimized use of materials
What are the different stages of production?
- Step 1 - 3D file processing and generation of manufacturing files, digitized layer by layer
- Step 2- Machine preparation (powder loading, transfer of manufacturing files) and machine start-up
- Step 3 - Lasering process: layer after layer of powder is added, followed by laser sintering (lasering) of the digitized layer according to the shape of the part to be manufactured.
- Step 4 - Machine unloading: removal of excess powder, cleaning of manufactured parts, high-temperature heat treatment and cutting of parts.
- Step 5- Finishing and post-treatment: removal of supports, manual surfacing, sand blasting and polishing
- Step 6 - Careful cleaning followed by strict, systematic inspection
"Laser sintering represents a real alternative when the performance of conventional manufacturing methods is no longer sufficient to meet the technical and economic requirements of product development. "
Dent All Group offers all types of laser-sintered prostheses (Titanium or Chrome Cobalt)
- Removable partial dentures
- Surgical guide
- Dental copings
- Crowns and bridges
- Inlay-Core
- Implant bar
- Implant bridge
- Orthodontic disjunction appliance
- Transpalatine bar
- Anatomical molar brace
- Orthodontic retainer
Dent All Group offers all your parts in Chrome Cobalt or Titanium and with different finishes.
Chemical composition
| Chromium | Cobalt | Molybdenum | Manganese | If | Fe | Ni | Carbon |
|---|---|---|---|---|---|---|---|
| 28-30% | Balance | 5-6% | < 1% | < 1% | < 0,5% | < 0,1% | < 0,02% |
Mechanical properties CrCo
| Rpe 0.2 | A% | Hardness | Modulus of elasticity | Expansion coefficient | Density |
|---|---|---|---|---|---|
| 817 MPa | 9.7% | 375 HV5 | 228.7 GPa | 14.5 10-6.K-1 | 8.336 kg/dm3 |
Chemical composition of Titanium powder
| Titanium | Al | V | Fe | Other |
|---|---|---|---|---|
| 90% | 6% | 4% | < 0.25% | 0.25% |
Titanium powder characteristics
| 0.2% tensile yield strength | Tensile strength | Hardness | Elongation | Thermal expansion coefficient from 20 to 500°. | Density |
|---|---|---|---|---|---|
| 795 MPa | 860 MPa | 330 Hv | 10% | 9.5 x 10-6 | 4,50 |