3D Printing in the Laboratory — What We Print and Why

3D printing isn't a single process. It's a set of technologies, each with a different purpose and level of accuracy. A lab doesn't print everything — it prints what makes specific technical and economic sense.

What We 3D Print

Diagnostic and Working Models (SLA, DLP). Accuracy of 25–50 µm — sufficient for any prosthetic work. Faster than gypsum casting, cheaper than milling PMMA models for high volumes.

Occlusal and Protective Splints (SLA). Occlusal splints, bleaching trays, protective splints for bruxism — precisely printed on the patient's model. No manual forming, repeatable thickness and contour.

Surgical Guides and Implant Templates (SLA, DLP). Guides for implant placement printed on a model with positioning consistent with the CAD plan — accuracy of ±0.1 mm, sufficient for guided implant surgery.

Temporary Prostheses and Provisionals (DLP). From dental-grade biocompatible resins — as provisionals during intermediate reconstruction stages.

What We Don't Print

Crowns and Bridges as Final Permanent Restorations. Printed resins — even dental-grade (Formlabs, Carbon) — do not meet ISO standards for permanent restorations in terms of chewing surface hardness and long-term durability. Final permanent restorations: milling from zirconia, e.max, or casting.

Veneers and Ceramic Restorations. The translucency and aesthetics of ceramics are unattainable in 3D printing.

Complete Dentures as Final Restorations. Printed resins have insufficient chewing surface hardness and too rapid wear for long-term complete dentures.

Economics of 3D Printing in the Laboratory

Parameter	SLA/DLP Printer	CNC Milling Machine (Models)
Equipment Cost	PLN 40,000–150,000	PLN 100,000–300,000
Time per model	2–4 h (with post-processing)	30–60 min
Batch Production	Several models simultaneously	One model at a time
ROI	12–24 months	6–12 months

The return on investment for a 3D printer is realistic with a volume of approximately 300–500 models per year. Below this threshold, outsourcing printing may be more advantageous.

What can a dental laboratory 3D print?

Diagnostic and working models, occlusal and protective splints, surgical guides, implant templates, and temporary prostheses. Final permanent restorations (crowns, bridges) are not printed — resins do not meet ISO standards for permanent restorations.

Will 3D printing replace milling in the laboratory?

Not entirely. Both technologies have their applications: 3D printing is effective for models and splints, while milling is used for final zirconia and e.max restorations. A hybrid laboratory utilizes both.

How accurate is SLA 3D printing?

SLA accuracy is 25–50 µm, DLP is 50–100 µm. Both technologies are sufficient for working models and splints.

How much does a 3D printer for a dental laboratory cost?

Dental-grade SLA/DLP printers cost PLN 40,000–150,000. Return on investment with a volume of 300+ models/year is 12–24 months.