The digital dental workflow is transforming how clinics and laboratories design and manufacture dental devices. Intraoral scanning, CAD, resin 3D printing and post-processing improve speed, traceability and repeatability. But final accuracy depends on the entire chain. An excellent printer will not compensate for an incomplete scan, poor nesting or unsuitable post-curing.

1. Acquisition by intraoral scanning

Intraoral scanning captures arches, preparations, occlusion and surrounding tissues. Quality depends on the scanning strategy, saliva management, optical access and patient stability. Glossy, subgingival or deep areas require particular attention. An incomplete or noisy file creates downstream design errors.

It is recommended to immediately check the mesh: holes, stretched areas, poorly aligned bite and unclear margins. Correcting at the chair is faster than discovering the problem after printing.

2. Export and file management

STL, PLY and OBJ formats are commonly exchanged. STL contains geometry only, while PLY/OBJ can preserve colour information useful for certain indications. Files should be named and archived with a clear convention: patient, date, indication, arch and version. Traceability is essential for medical devices.

3. Dental CAD

Design depends on the indication: model, surgical guide, aligner, temporary crown, impression tray, wax-up or denture base. Each application has its parameters: minimum thickness, offset, internal relief, drainage holes, contact areas, cervical margins and material compensation.

The CAD software must integrate the constraints of the resin and printer. For example, a surgical guide requires sleeve accuracy and a validated biocompatible resin. An aligner requires mechanical resistance and a finish suitable for intraoral wear.

4. Print preparation: orientation and supports

Orientation influences accuracy, surface finish, print time and deformation risk. With dental resin, a functional surface must not be damaged by poorly placed supports. Models are often oriented to optimize the base and reduce peel forces. Guides and aligners require a specific strategy to preserve critical areas.

5. Resin selection

Use a resin suitable for the indication and compatible with the printer. Model, castable, surgical guide, temporary, gingiva and biocompatible resins do not have the same properties. Exposure settings must match the machine, wavelength, layer height and validated profile.

6. Resin 3D printing

Printing must be stable: calibrated build platform, clean vat, homogenized resin and controlled temperature. Resin that is too cold becomes more viscous and may not flow correctly. Cured particles in the vat can cause defects or damage the film. Thin layers improve vertical resolution but increase production time.

7. Washing and post-curing

Post-processing is critical. Insufficient washing leaves uncured resin; excessive washing can weaken or deform some parts. Post-curing finalizes mechanical properties and biocompatibility. It must follow the resin manufacturer's recommended time, temperature and wavelength.

8. Inspection and finishing

After printing, check fit, functional surfaces, contacts, deformation and cleanliness. Supports must be removed without damaging critical areas. For devices worn in the mouth, finishing and cleaning protocols are essential.

Conclusion

A reliable digital dental workflow depends on consistency across the whole chain: intraoral scan, CAD, resin, orientation, printing, washing, post-curing and inspection. Productivity comes from repeatability, not rushing. By standardizing each step, clinics and laboratories can produce faster while maintaining the clinical accuracy required.

Machines-3D resources to go further

• Machines-3D dental solutions
• dental 3D scanners
• Graphy resins
• Dentifix3D resins
• contact a Machines-3D expert