The short answer
Both are real crowns; the difference is where the crown is made. A same-day crown is designed from a digital scan and milled from a ceramic block in the office, so it is bonded at the same visit. A lab crown is made by a dental laboratory from an impression or scan, and you wear a temporary until it returns. Your dentist will say which suits the tooth, the material needed and your bite.
General information, not a diagnosis. Your dentist will examine your mouth before recommending treatment.
What is actually different
You need a crown and have been offered a choice: finish it today, or come back once the lab is done. Both end with a custom-made cap cemented over your tooth. The ADA describes a crown as a cover that restores a tooth to its normal shape and size and can make it stronger, used when there is not enough tooth left to hold a filling, to protect a weak tooth from breaking, or to restore a broken one. That purpose does not change with the route.
What changes is the workflow. A lab crown follows the traditional sequence: numb and shape the tooth, take an impression or scan, place a temporary, and send the case to a dental laboratory. You return to have the temporary removed and the finished crown tried in, adjusted and cemented. The practice's dental crowns page describes this two-visit process.
A same-day crown replaces the lab with a chairside system. The ADA's glossary calls any restoration made outside the mouth an indirect restoration, and both routes qualify; the chairside version simply moves the fabrication into the office. ADA News has described chairside CAD/CAM setups that pair an intraoral scanner with a milling machine and furnace so a ceramic inlay, onlay or crown can be made during the appointment. The practice uses CEREC for this; its CEREC page walks through the scan, the on-screen design, the milling and the bonding, all in one visit.
What a same-day visit looks like
After the tooth is numbed and shaped, a small wand scans the tooth and the teeth around it instead of a tray of impression material. ADA News notes that intraoral scanners can give an accurate impression for crowns and short-span bridges and may be faster and more comfortable for patients than conventional impressions. The software builds a model and proposes a crown shape, which the dentist adjusts to your bite.
The design goes to the milling unit, which carves the crown from a solid ceramic block. Once milled, the crown is tried in, adjusted, finished and bonded. You leave with the permanent crown in place. Things to expect from this route:
- one numbing, one appointment, no temporary to protect
- a wait in the office while the crown is designed and milled
- a tooth-colored ceramic crown, since ceramic blocks are what chairside systems mill
- the same care afterward as any crown: brushing, cleaning between teeth, no chewing ice
What the two-visit route looks like
The lab route starts the same way, then diverges after the impression. A temporary crown protects the shaped tooth while the lab makes the permanent one. Temporaries are held with a removable cement by design, so the practice's crowns page asks you to be gentle with what you chew and how you brush around it until the second visit. The post on a lost filling or crown explains what to do if a temporary comes off.
At the second visit the temporary comes off, the lab crown is tried in, the bite and the contacts with the neighboring teeth are checked, and it is cemented. The trade for the extra visit is flexibility in material and in what a technician can do by hand, which matters for some teeth more than others.
| Factor | Same-day (CEREC) | Lab-made |
|---|---|---|
| Visits | One; the crown is bonded the same day | Two, with a temporary in between |
| Impression | Digital scan | Impression tray or digital scan |
| Material | Ceramic milled from a block | All-ceramic, porcelain-fused-to-metal or metal |
| Temporary crown | None | Yes; worn until the lab crown returns |
| Numbing | Once | Usually at both visits |
| Fits well for | Single crowns, inlays and onlays | Metal-supported crowns, bridges, multi-tooth matching |
Materials, in plain terms
Chairside milling uses ceramic blocks. The ADA's review of materials for indirect restorations lists zirconia, glass ceramics and resin-ceramic composites as the classes widely used for CAD/CAM, and says all-ceramic materials are indicated for inlays, onlays, crowns and veneers. It also notes that ceramics can chip or fracture, that one ceramic type (lithium disilicate) shows some wear compared with zirconia, and that back teeth, especially molars, see a higher rate of restoration fracture than front teeth.
A lab can also make porcelain-fused-to-metal and full-metal crowns. The ADA describes metal alloys as having proven effectiveness, durability and longevity, and notes that porcelain-fused-to-metal was the most common indirect restoration before CAD/CAM ceramics took over. The practice's crowns page lists all-ceramic, ceramic-on-metal and all-metal options and explains that front teeth usually get all-ceramic for appearance while a heavy-chewing back tooth may do better with metal support. If you grind your teeth, a night guard protects any crown.
When same-day is not the right fit
Same-day crowns are convenient, but the practice's restorative dentistry overview is plain that not every case suits same-day fabrication, and that it will say so when yours does not. Reasons a dentist may send a case to the lab instead:
- a material that is not milled chairside, such as a metal or metal-supported crown chosen for a heavy bite
- a larger case, such as a bridge or several crowns that need to be matched together; ADA News notes that complete-arch digital scans may be less accurate than conventional methods
- a tooth that needs a root canal first; the AAE says the crown or other restoration follows the root canal
- a case where the dentist wants a technician's hand finishing for shade or shape
Cost, insurance and what to ask
Fees differ by material and by case, and this page does not quote prices. The practice accepts all PPO dental plans and does not accept Medi-Cal or Denti-Cal; the office can review your benefits and give an estimate before treatment, as its insurance and payment page explains. Whether a plan treats a same-day crown differently from a lab crown is a question for your plan.
Useful questions at the consult: Which material do you recommend for this tooth and why? Is this tooth a good fit for same-day milling? If a temporary comes off, what should I do? The questions to ask before a crown, veneer or root canal guide gives a fuller list. If you are still deciding whether the tooth needs a crown at all, start with crown vs. filling vs. onlay, and if this will be your first visit to the office, what to expect at your first visit covers the paperwork and the exam.