CEREC is a system that lets dentists design and mill ceramic restorations like crowns, veneers, and inlays right in the office, often in a single appointment. Instead of taking a putty impression of your teeth and sending it to an outside lab (then waiting one to three weeks), your dentist scans your tooth digitally, designs the restoration on a computer screen, and fabricates it from a solid block of ceramic while you sit in the chair. The whole process typically takes a few hours.
How the System Works
CEREC stands for Chairside Economical Restoration of Esthetic Ceramics, though most people just know it by the brand name. Developed by Dentsply Sirona, the system has three core components: a digital scanner, design software, and a milling machine.
The scanner is a handheld wand your dentist moves across your teeth. Older versions projected blue LED light onto the tooth surface and captured the reflection to build a 3D model. The latest generation, Primescan 2, adds near-infrared and fluorescence technology that can also help detect cavities during the scan. The wand captures images at extremely high resolution, down to 25 microns (roughly a quarter of the width of a human hair), and builds a complete digital model of your tooth and the surrounding area in seconds.
Once the scan is done, your dentist uses CAD software to design the restoration on-screen, adjusting the shape, contours, and bite. That design file goes straight to a compact milling machine in the office, a six-axis unit that carves the restoration from a single block of dental-grade ceramic or zirconia. After milling, the dentist checks the fit, color-matches, and bonds it to your tooth.
What Happens During the Appointment
A CEREC appointment follows a predictable sequence. First, the dentist prepares your tooth by removing a thin layer of enamel so the restoration will sit flush. Then the intraoral scanner captures a 3D digital impression, replacing the traditional goopy mold. Your dentist designs the crown or inlay using the software, tweaking the shape until it matches your bite and the surrounding teeth. The milling machine fabricates the piece, and the dentist verifies size, shape, and color before permanently bonding it in place.
Most single-crown appointments wrap up in about two hours, though more complex cases can take longer. The key advantage is that you walk out with a finished restoration the same day, no temporary crown, no second visit, no weeks of waiting.
What It Can Restore
CEREC handles a wide range of restorations: crowns, inlays, onlays, veneers, and even some bridges. The materials available for chairside milling have expanded significantly over the years. Standard options include dental-grade porcelain blocks in various shades and translucencies that mimic natural tooth appearance. Zirconia blocks are also available for situations that demand extra strength, particularly for back teeth or bridges that span multiple teeth. Some practices also mill from hybrid ceramic-resin blocks, which combine the aesthetics of ceramic with a slight flexibility that reduces chipping risk.
Accuracy and Fit
One common concern is whether a crown milled in an office can match the precision of one handcrafted by a lab technician. The research is reassuring. Studies measuring the gap between a CEREC crown and the tooth it sits on consistently find marginal gaps in the range of 53 to 79 microns, well within the clinically acceptable threshold (most prosthodontists consider anything under 120 microns acceptable). A military research review found that digital workflows actually produced tighter fits than conventional impressions: an average gap of 49 microns for digitally fabricated crowns versus 71 microns for analog ones.
That said, not every restoration type is equally easy to mill. Inlays and onlays have more complex shapes than crowns, with narrow grooves and tight proximal walls that can be harder for the scanner to capture accurately. The deeper and more corrugated the preparation, the more room for minor scanning and milling errors. Crowns, with their simpler perimeter margins, tend to produce the most consistent fit.
How Long CEREC Restorations Last
A systematic review of clinical studies found that CEREC ceramic inlays had a mean survival rate of 97.4% over an average follow-up period of just over four years. Longer-term data from individual studies shows strong performance out to 10 years and beyond, though survival rates vary depending on the material used, where in the mouth the restoration sits, and the patient’s bite forces and habits. In general, CEREC restorations perform comparably to traditional lab-made ceramics over time.
Cost Compared to Traditional Crowns
CEREC crowns tend to cost slightly more than traditional lab-fabricated crowns. The higher price reflects the dentist’s investment in scanning, software, and milling equipment, plus the convenience of finishing everything in one visit. That said, you avoid a second appointment and the hassle of wearing a temporary crown for weeks, which some patients consider worth the premium. Insurance coverage is generally the same for both, since insurers typically reimburse based on the restoration type (crown, inlay, etc.) rather than how it was made. Exact prices vary widely by region and practice.
Where CEREC Falls Short
Single-visit convenience comes with trade-offs. Restorations that require extensive cosmetic layering, such as front-tooth veneers that need to perfectly blend multiple shades and translucencies, may still look better when hand-layered by a skilled lab ceramist. A milled block, even a high-quality one, starts as a single uniform material rather than being built up in layers the way a technician would.
Deep subgingival margins (where the tooth preparation extends well below the gumline) can also be difficult for the scanner to capture cleanly. If the scanner can’t see the margin, the software can’t design to it. In those cases, a conventional impression material that flows beneath the gum tissue may produce a more reliable result. Complex multi-unit bridges or full-mouth reconstructions are another area where many dentists still prefer the flexibility and quality control of an outside lab.
The technology also requires the dentist to invest significant time in training. Designing restorations chairside is a different skill set than sending a case to a lab, and the learning curve affects both efficiency and outcomes early on.
The Latest Hardware
The newest iteration, Primescan 2, was unveiled at the International Dental Show in 2025. It features integrated cavity detection using near-infrared imaging alongside the standard surface scan, so your dentist gets diagnostic information and restoration data from a single pass. The unit also cuts data bandwidth requirements in half compared to its predecessor, runs wirelessly from a redesigned cart with a built-in battery, and uses a reusable steel sleeve for the scanner tip that can be sterilized between patients rather than replaced. These are incremental but meaningful upgrades that make the system faster and more practical in a busy office.