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Why does the laboratory matter so much in digital full-arch, and how do I evaluate a lab partner?

There is a common misconception that the accuracy achieved at intraoral capture, whether by scanning or photogrammetry, carries through unchanged to the finished restoration. In reality, a full-arch bridge passes through many stages, and at each one the dimensional accuracy of the original data can be preserved, improved, or compromised.

Stages where accuracy can change: CAD design, CAM processing, milling, sintering, finishing, and several manual handling steps in between.

Variable Effect on fit
Worn milling burs Can reduce milling accuracy
Room temperature and humidity Can influence milling performance
Blank positioning Affects how accurately the part is cut
Manual finishing procedures Introduces hand-controlled variation
Operator consistency Inconsistent technique compounds error

The takeaway is that accurate data capture alone is not enough. Consistent laboratory protocols across CAD/CAM and finishing are equally critical, because even an excellent digital capture can yield a poorly fitting prosthesis if the lab workflow is not carefully controlled.

How to evaluate a prospective lab partner: Because so much rides on the lab, it is entirely reasonable to vet its digital capabilities before committing case work. A lab that is open to discussing the details below demonstrates the collaborative approach that successful digital workflows require.

Area Questions to ask
Data management How do you manage and stitch layered data sets in CAD software?
CAM strategy What CAM strategies do you use for full-arch frameworks, and how consistently do they produce predictable outcomes?
Manual handling How much manual handling occurs from milling through finishing?
Equipment How is milling equipment maintained and serviced? How old is it, and what is the tool-replacement schedule?
Environment How is the milling area's environment (temperature and humidity) controlled?
Team How experienced is the technical team performing the work?

 

Additional Resources

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Contact Information

For help with a digital denture solution for your next case, contact ROE Dental Laboratory: