The plain definition
An in-house lab means the dental practice itself owns the equipment and employs the people who design and manufacture restorations like crowns, veneers, and full-arch prosthetics — as opposed to sending that work to a separate, independently owned dental laboratory business. It's the difference between a practice doing the manufacturing itself versus outsourcing it to a vendor down the supply chain that the patient never interacts with or even knows about. Both models exist widely; the in-house model is simply less common because it requires the practice to invest in its own scanning, design, and milling equipment, plus the staff training needed to operate it well and consistently, and the ongoing cost of keeping that equipment current as the technology improves. That upfront investment is exactly why fewer practices choose to build it out themselves.