The 30-second answer
For the vast majority of crowns, a same-day CEREC crown is as good or better than a traditional lab crown — milled from the same dental porcelain (lithium disilicate or zirconia), bonded with the same adhesive, and lasting as long. Long-term clinical studies show 90%+ ten-year survival rates for properly placed CEREC crowns.
Traditional lab crowns still have a few advantages in specific cases: very complex cosmetic front teeth, full-arch reconstructions, or patients who prefer human craftsmanship over digital fabrication. For 95% of crowns, same-day wins on convenience without giving up quality.
What's actually different
| Step | Traditional Crown | CEREC Same-Day |
|---|---|---|
| Impression | Goopy material in a tray, 5 minutes of holding still | Digital scan, 5 minutes of waving a wand around the tooth |
| Wait time | 2–3 weeks while lab makes the crown | ~30 minutes while in-office mill carves it |
| Temporary crown | Yes — can come off, restricts diet | Not needed |
| Appointments | Two, scheduled 2–3 weeks apart | One, ~2.5 hours total |
| Numbing | Twice (once each visit) | Once |
| Material | Lithium disilicate or zirconia | Same — lithium disilicate or zirconia |
On accuracy
Old "in-office" mills from a decade ago had a reputation for less precise fits than lab crowns. That gap is gone. Modern CEREC systems (PrimeMill paired with Primescan digital scanner — what we use) consistently produce marginal fits within 6 micrometers — well within clinical tolerance. Several head-to-head studies have shown digital impression accuracy meeting or exceeding traditional impression material.
Where lab crowns still have an accuracy edge: very long-span bridges (4+ teeth) and full-arch cases. Single crowns and 3-unit bridges are firmly in the same-day camp now.
On strength and longevity
The porcelain blocks used in CEREC mills are dental-grade lithium disilicate (the same material as Emax) or zirconia — exactly what high-end labs use. The crown is just shaped differently (carved from a solid block vs. layered by a technician). Long-term outcomes are statistically equivalent.
What affects crown longevity isn't the lab vs. mill — it's your bite, your hygiene, whether you grind your teeth, and how the crown is bonded to the tooth. A CEREC crown bonded by a careful dentist will outlast a lab crown placed sloppily, and vice versa.
When a traditional lab crown is the better call
Three situations where I'll send a case to a lab instead of milling in-office:
- High-stakes cosmetic front teeth — when matching subtle layered translucency in adjacent natural teeth matters more than convenience. A skilled lab technician hand-layering porcelain can hit nuances no mill can.
- Full-arch reconstructions — for a complete redesign of your bite, the lab's ability to physically articulate the case on a model is still valuable.
- Patients who simply prefer it — if you want a lab crown, you can have a lab crown. Same materials, same biology, just a slower path.
Cost — same or different?
In our office, same-day and traditional crowns are billed at the same fee, so insurance pays the same and your out-of-pocket is the same either way. Some practices charge a premium for same-day; we don't.
What you save with same-day: a second appointment (no second day off work), a second round of numbing, and the inconvenience of wearing a temporary for two weeks. For most patients those have real value.