Same-Day Crowns: How CEREC Works

What CEREC is

CEREC (Chairside Economical Restoration of Esthetic Ceramics) is one of several chairside CAD/CAM systems. A practice that has an in-office mill can use such a system to design, mill, and fit a ceramic crown in a single visit — typically in about 60–90 minutes of chair time.

The process, step by step

Step 1 — Prepare the tooth (20–30 min)

Remove decay, shape the tooth to accept a crown.

Step 2 — 3D scan (3–5 min)

A wand scans the tooth; no impressions, no gagging.

Step 3 — Design (10–15 min)

Software proposes a crown shape. The dentist refines size, contact points, and occlusion on-screen.

Step 4 — Mill (10–15 min)

A block of ceramic is milled into the crown by an in-office machine.

Step 5 — Glaze and cement (15–20 min)

Crown is glazed in a ceramic furnace, then bonded to the tooth.

Total: roughly 60–90 minutes of chair time, sometimes longer. No second appointment, no temporary crown, no waiting for a lab.

What CEREC does well

• Single-tooth crowns on molars and premolars
• Inlays and onlays (compared in onlay vs inlay vs crown)
• Veneers (selected cases)
• Emergency single-tooth restorations when a crown fractures

What CEREC does less well

• Front-tooth aesthetics: the most demanding veneers and front crowns can still benefit from a ceramist layering porcelain by hand. Chairside front teeth can look very natural, but hand-layering gives more control over colour and translucency.
• Full arches: volume of work better handled in stages
• Translucent / complex shade matching: improving but not yet at the level of a skilled hand-layered restoration

The ceramic types

• Lithium disilicate (E.max): strong, aesthetic, handles most cases. This is the workhorse material for chairside crowns.
• Zirconia: stronger than E.max, slightly less translucent, well suited to back teeth
• Feldspathic ceramic: very lifelike and used for some milled veneers and inlays, but weaker than lithium disilicate or zirconia

A fuller comparison is in zirconia vs E.max vs PFM crowns.

Typical cost

At Paradise Dental Clinic, a crown in E.max or zirconia typically costs AED 2,500–6,000 (see pricing). The material, the tooth and any build-up needed before the crown affect where a case falls in that range. Whether a same-day option exists depends on whether a practice has an in-office mill, and some practices charge more for same-day convenience, so ask how the crown will be made when you compare quotes. More detail: dental crown cost in Dubai.

Long-term outcomes

Published long-term studies of chairside-milled ceramic crowns report survival comparable to laboratory-made crowns, provided the material suits the tooth and the bite. Fit and bite adjustment matter more to longevity than where the crown was milled.

When a same-day crown makes sense

• A premolar that fractured and needs immediate restoration
• You travel for work and can't commit to a 2-week process
• You dislike temporary crowns
• A molar needs a crown and front-tooth aesthetics aren't involved

When a lab-made crown is the better choice

• Front teeth where a ceramist will layer porcelain
• Complex cases with multiple units
• Cases that benefit from a trial smile phase

If you choose a lab crown: caring for the temporary

A traditional lab crown means wearing a temporary for one to two weeks while the final crown is made, and temporaries are deliberately held on with weak cement so they can be removed easily. Clean around it carefully: when flossing, slide the floss out sideways rather than lifting it up through the contact, which can pull the crown off. Mild sensitivity to cold is common. If the temporary loosens or comes off, keep it and contact your dentist promptly; an uncovered tooth can shift slightly and affect the fit of the final crown.

Common questions

Can I eat normally with a temporary crown?

Mostly, with some care, until the final crown is fitted, usually within one to two weeks. For the first 24 hours stick to soft food, then chew on the opposite side of the mouth. Avoid sticky foods such as caramel and chewing gum, which can pull the temporary off, and very hard foods such as nuts or ice, which can crack it.

Is a CEREC crown as good as a traditional lab-made crown?

Both approaches produce reliable crowns, and long-term success is comparable. A CEREC crown is designed and milled chairside, usually from E.max or zirconia blocks, so it can be fitted in one visit. A traditional crown is made by a dental laboratory over more than one visit and lets a ceramist hand-build layers for more individual colour and translucency. Same-day milling suits many back teeth where convenience matters; complex front-tooth aesthetic cases often benefit from a lab-crafted crown.

What does CAD/CAM mean in dentistry?

CAD/CAM stands for computer-aided design and computer-aided manufacturing. A digital scan of the prepared tooth is loaded into design software, where the crown, inlay, onlay or veneer is shaped to fit against the neighbouring and opposing teeth. A computer-controlled mill then cuts the restoration from a solid block of ceramic or composite. CEREC is one branded CAD/CAM system among several. Because the design and milling steps are digital, fit and shape are consistent from case to case rather than dependent on hand-made wax-ups, although the final colour characterisation may still be finished by hand. The wider picture is covered in the digital dentistry revolution.

Is CAD/CAM only used for same-day crowns?

No. CAD/CAM means a restoration is designed in software from a digital scan and then made by a milling machine. Crowns are the most common use, and when the mill is in the practice the crown can be made the same day. The same design-and-mill process is also used by dental laboratories, so a crown can be CAD/CAM-made even when it takes two visits.

What is a bite registration, and does a digital scan replace it?

A bite registration records how your upper and lower teeth meet, so a lab-made crown, bridge or veneer fits your bite rather than sitting high. Traditionally this was done by biting into wax or a fast-setting silicone. With CEREC and other digital workflows, an intra-oral scan captures both arches and the bite in one step, replacing the physical material. Either way, the goal is a restoration that needs minimal adjustment when it is fitted.

What is chair-side dentistry?

Chair-side dentistry means a restoration is designed and made during the same visit rather than being sent to an external laboratory. The two main examples are CEREC-style milling, where a crown or onlay is designed on screen and milled from a ceramic block, and composite bonding, where tooth-coloured resin is sculpted directly on the tooth. Avoiding laboratory delays means the result is completed the same day.

Practical decision guide

General dental decisions should preserve healthy tooth structure whenever possible. A good plan moves from diagnosis to the least-invasive durable treatment, then to prevention so the same problem does not repeat.

Check this first

• X-rays, pulp vitality, crack lines, gum pocketing, bite contacts, and how much natural tooth remains.
• Whether the problem is active disease, old restoration failure, trauma, wear, or a cosmetic concern.
• Whether a filling, onlay, crown, root canal, extraction, or monitoring is the right next step.

When to book sooner

• Pain wakes you at night, lingers after hot or cold, hurts on biting, or comes with swelling.
• A crown or filling falls out, a tooth cracks, or a sharp edge is cutting the tongue or cheek.
• You notice pus, fever, spreading swelling, or difficulty opening, swallowing, or breathing.

Topic-specific notes

• For material choices, ask why that material fits the tooth location, bite force, aesthetics, allergy history, repairability, and expected lifespan.

Questions to ask at the appointment

• What is the diagnosis, and what evidence supports it on the x-ray or clinical exam?
• What is the smallest treatment that solves the problem predictably?
• What failure signs should I watch for after treatment?

Dubai patient note

If insurance is involved, ask whether pre-approval is required, what codes will be submitted, and what alternatives are clinically acceptable if coverage is limited.

References

• Journal of Dentistry — CAD/CAM crown longevity