What should a general dentist look for in a crown?

The ADA-referenced clinical acceptability threshold for crown marginal gap sits under 120 microns, with the practical clinical target closer to 50 microns for long-term periodontal stability and minimal cement washout risk. Digital workflow labs running calibrated milling typically hold margins in the 25-50 micron range. If a crown is consistently coming back at 80-100 microns or higher, that is a CAD or milling calibration issue at the lab, not a prep issue, and is worth raising directly with the technician on the case.

Specify per case, not per habit. Monolithic zirconia at 1,100+ MPa is the conservative choice for posterior crowns under heavy occlusal load, especially second molars and bruxer patients. Lithium disilicate at around 400 MPa gives the translucency and chameleon effect anterior cases need to disappear next to natural dentition. For premolars the call can go either way and depends on smile-line visibility. A good lab will discuss the call with you on borderline cases rather than defaulting to whatever material runs fastest through their mill.

Published turnaround for a standard single-unit crown on a digital workflow runs 5-7 business days from case receipt to ship date, with full-arch and complex esthetic cases extending to 10-14 business days. If a lab cannot quote a turnaround window in writing, or routinely misses the window without proactive communication, that is the warning sign. Dani Dental holds a published turnaround on every case category and the technician on the case is reachable by direct line if the schedule shifts.