A dental crown covers every surface of a tooth that shows above the gumline, and that full coverage is why a dentist chooses one. When decay, a fracture, a large aging filling, or root canal treatment has taken a big share of a tooth's structure, the walls left standing are thin, and thin walls flex each time the jaw closes. Each flex can push a crack deeper or loosen the material holding the tooth together. A crown encloses those walls, holds what remains of the tooth together from the outside, and takes the chewing force on its own surface. Getting one runs across two appointments with a temporary crown in between, and each step pairs with what the dental team does and what you feel or do in the chair:
| Step | What happens | What you feel or do |
|---|---|---|
| Exam and X-ray | The tooth, its gum, and its bite are examined, and an image shows the root and the bone around it | Open for the exam, then bite on a small holder for the image |
| Numbing | Local anesthetic is placed near the tooth after a numbing gel is applied to the gum | A brief sting or pressure, then a heavy, thick feeling across the area |
| Shaping the tooth | Decay and weak filling material come out, and the outer layer is reduced to make room for the crown | Vibration, water spray and suction; raising a hand pauses the work |
| Impression or digital scan | The shaped tooth, its neighbors, and the teeth above or below are recorded | Hold still while a tray of soft material sets, or keep your mouth open for a scanner |
| Temporary crown | A resin crown is shaped to fit and held on with a soft cement | You leave with a tooth that looks whole and chew on the other side |
| Fitting and cementing the permanent crown | The temporary comes off; the new crown is tried in, adjusted, and cemented | You check the look and the bite, then feel firm pressure as the crown is seated |
Why a Crown Instead of a Filling
Whether a damaged tooth needs a filling or a crown depends on how much sound structure remains after the damage is cleaned out, and that decision is made during the exam, before the tooth is shaped at all.
Crowns also cover teeth after root canal treatment, anchor fixed bridges, and sit on implants. A crown on a natural tooth, shaped to receive it, follows the two-visit sequence.
The First Visit
Exam and X-ray
The appointment opens with a look at the tooth, the surrounding gum, and the teeth it meets when you close your mouth. An X-ray shows what the eye cannot: decay hidden under an old filling, the condition of the bone around the root, and signs that the pulp, the living tissue in the core of the tooth, is inflamed or infected. When the pulp is involved, the crown waits until the inside of the tooth is treated, and a referral to a specialist for root canal treatment comes first.
Choosing the Material and Shade
Crowns are made from all-ceramic materials (including zirconia and glass ceramics), from porcelain fused to a metal base, and from gold or other metal alloys. The choice depends on how visible the tooth is when you smile, how much force it takes to move, and how much space is between it and the tooth it meets. A metal crown can be made thinner than a ceramic one and still hold up, so it needs less tooth removed. A ceramic crown requires greater thickness to achieve its strength, and in exchange, it can match the color of the adjacent teeth.
For a tooth-colored crown, the shade is picked at the start of the visit. A shade guide, a set of tooth-shaped tabs in graded colors, is held beside the neighboring teeth. The timing matters: enamel loses moisture while the mouth is held open, and dried enamel reads lighter than it does once saliva returns, so a shade picked at the end of a long appointment can come back from the lab too light.
Numbing
A numbing gel is applied to the gum first, followed by an injection of local anesthetic near the tooth. Anesthetic blocks sharp sensation but leaves pressure and vibration, so both still come through during the work. A sharp twinge is a reason to raise a hand; the work stops, and more anesthetic can be given.
Shaping the Tooth
Decay and any weak old filling come out first. Where a large piece of the tooth is missing, it is rebuilt with filling material so the crown has a solid core to grip. The outer layer is then reduced: roughly 1 to 2 millimeters come off the chewing surface, depending on the material, with a smaller amount taken from the sides. The sides are given a slight taper so the crown can slide on in one direction, and the edge of the preparation, called the margin, is finished at or just under the gumline, where the crown will seal against the tooth.
Impression or Digital Scan
A tray of soft impression material is pressed over the teeth and held until it sets, or an intraoral scanner is moved over the teeth to build a three-dimensional model on a screen. Either record has to capture the full margin, the neighboring teeth, and the opposing teeth, and a separate bite record shows how your jaws meet. From those records, the lab shapes a crown whose sides touch its neighbors and whose chewing surface meets the opposing tooth at the right height.
Living with a Temporary Crown
The temporary crown placed before you leave is made of acrylic or composite resin and is held in place with a cement designed to release at the next visit. In the meantime, it covers the exposed dentin, keeps the gum line in shape, and holds the tooth in place in your bite while the lab works.
Resin is weaker than the finished crown, and the cement is intentionally soft. Those two facts set the rules for the time between visits:
- Leave chewing gum, toffee and chewy candy alone, since sticky food can lift the temporary off the tooth.
- Leave ice, nuts and hard candy alone as well, since hard food can crack the resin.
- Brush the temporary with the rest of your teeth, gently along the gum edge.
When pulling floss back up through the contact beside a temporary crown, be careful not to catch its edge and lift it off the tooth. Letting go of one end and drawing the floss out sideways cleans the same gap without that upward pull.
A temporary crown does not seal as tightly as a permanent crown, so the tooth beneath it can react to cold air, cold drinks, or heat. A temporary that rocks, cracks, or feels high when you bite is a reason to contact the office. If it comes off entirely, keep it and contact the office, because the shaped tooth should not stay uncovered.
The Second Visit
When the permanent crown is back from the lab, the temporary comes off, and the leftover temporary cement is cleaned from the tooth. Whether numbing is repeated depends on how sensitive the shaped tooth is. The new crown is then seated without cement so it can be checked from several angles before anything is permanent:
Margins: The edge of the crown must meet the edge of the preparation with no gap or overhang. A fine instrument run along the gumline can feel for either, and an X-ray can confirm the fit between the teeth.
Contacts: Floss is passed between the crown and each neighbor. Each contact should be snug enough to keep food out without shredding the floss.
Bite: You close and slide your teeth together, and the crown is adjusted until your bite feels the way it did before the tooth was shaped.
Appearance: For a tooth-colored crown, the shade and shape are compared with the adjacent teeth, and you look at it in a mirror.
Cementing follows. The tooth is cleaned and dried, the crown's inner surface is coated with cement or a bonding resin, and the crown is pressed firmly into place. Some cements harden under a blue curing light, and others set on their own within minutes. Excess cement is cleared from the gumline and from between the teeth, because hardened cement left under the gum keeps it irritated. A last bite check closes the appointment.
Aftercare in the First Days
Numbness can last a few hours after either visit. Until it fades, the cheek, lip, and tongue on that side can be bitten or burned without you noticing, so chewing and hot drinks wait until feeling returns.
Once the numbness is gone, the new crown should meet the opposing tooth at the same moment as the rest of your teeth. A crown that lands first takes the force of each bite before the surrounding teeth do, and it can bruise the ligament that holds the root in its socket, so the tooth can then ache when you chew. A bite checked while you were numb can feel different later, and a crown that feels high is a reason to contact the office for an adjustment.
A newly shaped tooth can react to cold or heat for a period after the crown is placed. Sensitivity that grows instead of easing, or pain that throbs without anything touching the tooth, is also a reason to contact the office.
Swelling that spreads into the cheek or jaw, a fever, or throbbing pain that builds after crown work can signal infection. Phone the office that day so the dentist can examine the tooth, rather than waiting it out at home.
Brush and floss around the crown along with the rest of your teeth from the first day. The crown itself cannot decay, but the natural tooth beneath its margin can, and the seam where the crown meets the tooth is where plaque tends to collect.
Frequently Asked Questions
Some offices make crowns in a single appointment. The digital scan feeds design software, and a milling machine in the office carves the crown from a solid block while you wait. The crown is then polished or glazed and bonded the same day, so no temporary crown is needed. Chairside milling works with ceramic and resin blocks, so a crown planned in a gold alloy still goes through the two-visit route with a lab.
It is articulating paper, a thin strip coated with ink or dye. When you tap and slide your teeth together over it, it leaves colored marks wherever teeth touch. A mark that shows on the crown and not on the neighboring teeth, or one that prints darker than the rest, marks a spot that hits first. That spot is ground down and polished, and the paper is used again until the marks spread evenly.
For the impression or scan to capture a margin that sits at or under the gumline, the gum is held back from the tooth for a few minutes. A thin retraction cord is tucked into the shallow groove between gum and tooth and removed just before the record is taken. That pressure can leave the gum edge tender for a few days.
On a crown with porcelain layered over a zirconia or metal core, that outer porcelain can chip under the load. A monolithic crown, milled or cast from one material all the way through, such as solid zirconia or a gold alloy, has no separate outer layer to chip. Mention grinding at the consultation, since it changes which material the dentist recommends.
Say so before it is cemented. A crown in the wrong shade or shape can go back to the lab to be adjusted or remade while the temporary goes back on. Once a crown is cemented, removing it can mean cutting through it, and a new crown is then made.
Upper teeth sit in bone thin enough for anesthetic placed beside the tooth to soak through, so the numbness stays close to that tooth and the nearby cheek and lip. The lower back teeth sit in dense bone, so the anesthetic is placed near the nerve as it enters the lower jaw toward the back of the mouth. That nerve also supplies the lower lip and chin, and the nerve to the tongue runs close beside it, which is why the lip, chin, and half the tongue on that side can go numb together.
Reserve a crown consultation — the tooth is examined and X-rayed, and the material, shade, and visit sequence are planned around it. Jennifer Fineberg DDS welcomes patients in Glendale, Peoria, and the West Valley. Call (623) 362-2550.