Digital Dentistry Advances Chairside Milling Vs 3D Printing for Crowns

The digital wave is transforming global healthcare, and dentistry is no exception. The traditional crown fabrication process, which previously relied on external dental laboratories, can now be completed entirely within dental offices. However, dentists face a crucial decision between two emerging technologies: in-office milling and 3D printing. This comprehensive analysis examines both technologies to help dental professionals make informed choices in the digital era.

For decades, crown fabrication has been a time-consuming process requiring physical impressions sent to external laboratories. Digital technology has fundamentally transformed this workflow. With intraoral scanners, CAD/CAM software, and either milling machines or 3D printers, dentists can now design and fabricate crowns chairside, significantly reducing turnaround time and costs while improving patient satisfaction.

These two digital crown fabrication methods share technological foundations but differ significantly in operation, materials, advantages, and clinical applications.

This technology carves crowns from solid material blocks using milling machines. The workflow includes:

1. Digital scanning with intraoral scanners
2. CAD design customization
3. CAM milling (typically 10-30 minutes)
4. Polishing and adjustments
5. Cementation

• Superior material strength (zirconia, glass ceramics)
• Excellent aesthetics matching natural teeth
• High precision for optimal fit and occlusion
• Efficient same-day completion

• Higher initial equipment investment
• Requires technical training
• Limited material options compared to labs

This additive manufacturing technology builds crowns through material deposition. The process involves:

1. Digital scanning
2. CAD design optimized for printing
3. Printing (30 minutes to several hours)
4. Post-processing (support removal, curing, polishing)
5. Cementation

• Lower equipment costs
• Broader material selection
• Capability for complex geometries
• Enhanced customization options

• Lower material strength (primarily resin-based)
• Reduced precision compared to milling
• Time-consuming post-processing
• Unproven long-term durability

Material selection critically impacts crown durability, aesthetics, and biocompatibility. Milling utilizes high-strength materials like zirconia (900-1200 MPa flexural strength) and glass ceramics (150-250 MPa), while 3D printing primarily uses resin composites (80-120 MPa).

In-office milling offers streamlined workflows with CAMouflage NOW materials requiring under 10 minutes milling time and no post-processing baking. 3D printing involves additional post-processing steps that extend production time, making same-day completion challenging.

While less ideal for permanent crowns, 3D printers excel at producing:

• Orthodontic appliances
• Surgical guides
• Study models
• Temporary restorations

In-office milling remains superior for durable, aesthetic permanent crowns, while 3D printing offers advantages for ancillary applications. Dentists must evaluate clinical requirements, material properties, and workflow efficiencies when selecting fabrication methods. As digital technology advances, both modalities will continue evolving to serve diverse dental needs.