A single crown design follows a fixed sequence: check the scan is complete (prep arch, opposing arch, bite registration), read the case notes, mark the margin, review the software's proposal, check contacts and occlusion, then export. The software generates a shape in seconds; the real work is the checking before and after.
A single crown is the most common case type a dental CAD designer will ever touch, and it's also the easiest one to rush. The software will happily generate a full anatomical proposal in seconds — the actual design work is everything that happens before and after that proposal. Here's the sequence a careful designer follows from scan to export.
Review the scan and case instructions
Before touching any tool, check that the scan is actually complete: prep arch, opposing arch, and a usable bite registration. Look for motion artifacts, missing margin data, or debris interference that could throw off everything downstream. Then read the case notes — margin type, material, shade, and any contact or occlusion preferences the lab has specified.
Mark the margin line
This is the step that most directly determines fit. Trace the prep line carefully, paying particular attention to subgingival areas where the finish line isn't fully visible in the scan and has to be inferred from the surrounding tissue and prep geometry.
Set the insertion axis and check undercuts
Choose an insertion path the crown can actually seat along. Undercuts that look minor on screen can block a physical crown from seating cleanly, so this gets checked before any anatomy is built, not after.
Build the initial anatomical proposal
Generate a starting proposal from the tooth library, using the adjacent and opposing anatomy as a reference. This proposal is a first draft, not a finished design — treating it as final is where a lot of rushed crowns go wrong.
Refine interproximal contacts
Adjust contact tightness with the neighboring teeth by hand. Too loose and food packs into the gap; too tight and the patient can't floss it comfortably. Neither extreme shows up clearly until someone's actually chewing or flossing with it.
Check and refine occlusion
Verify contact points in centric occlusion, then check lateral and protrusive excursions too — not just the bite-down position. A high spot that only appears during a lateral movement is one of the most common causes of a crown coming back for adjustment.
Refine emergence profile and contour
Shape the transition from the margin up through the gum line so it supports the surrounding tissue naturally, rather than ballooning out or pinching in. This is as much about long-term gum health as it is about how the crown looks.
Run a final QC pass
Check minimum wall thickness against the chosen material's requirements — zirconia, e.max, and PFM each have different tolerances. Confirm margin fit is still clean after all the anatomy adjustments, and review the full design against the scan one more time before calling it done.
Export and package the file
Export in the format and orientation the mill or printer expects, with clear file naming and nesting set up correctly. A technically perfect design that's exported wrong just creates a different problem downstream.
Why the sequence matters more than any single step
None of these steps are individually complicated — margin marking, contact adjustment, and occlusion checks are all things most dental CAD software makes fairly accessible. What separates a fast, sloppy crown from a good one is almost always the order and the discipline: checking undercuts before building anatomy, checking every excursive movement instead of just centric occlusion, and treating the software's first proposal as a draft instead of a finish line.