Why Your Dentist Might Not Use Putty Anymore

If you've had a crown in the past, you probably remember the tray, the gooey impression material, and the gagging. Many dental clinics have replaced that entire process with a small handheld scanner. It looks like a pen with a camera on the end. It moves around your mouth for a couple of minutes, and within seconds a 3D image of your teeth appears on a screen.

No tray. No gagging. No waiting two weeks for a lab to pour stone models. In many cases, you can have your permanent crown the same day. This guide walks you through what actually happens — in plain language — from the moment the scanner enters your mouth to the moment your dentist cements your new tooth.

Step 1: Looking at the Problem — Diagnosis

Before anything is scanned, your dentist figures out what's wrong. This part hasn't changed. They still use X-rays, look in your mouth with a mirror, and ask you questions. The digital part starts when they decide you need a crown, an inlay, or a veneer.

What's new: many dentists now take digital photos and a quick scan of your whole mouth as part of the exam. These images go into your file forever. They help the dentist explain the problem to you, and they help the lab understand exactly what needs to be fixed.

Step 2: Shaping the Tooth — Preparation

To place a crown, the dentist must reshape the tooth so the crown fits over it. They remove a thin layer of the outer tooth — usually about 1.5 to 2 millimeters — using a high-speed handpiece (the drill). The goal is to create a smooth, rounded shape with a clear edge (called a margin) where the crown will stop.

This step is exactly the same whether your crown is made digitally or the old-fashioned way. The difference is what happens next.

Step 3: Keeping Things Dry — Isolation

The scanner is a camera. Cameras can't see through blood, saliva, or puffy gums. So your dentist or assistant needs to keep the area dry and push the gum away from the edge of the preparation.

They might use:

• A rubber sheet (rubber dam) stretched over the tooth
• Cotton rolls tucked into your cheek
• A thin string (retraction cord) placed gently around the gum line to push tissue aside
• A special gel that shrinks the gum temporarily

This is the part patients notice the most. It feels like pressure, not pain. The string stays in for a few minutes, then comes out, and the scanner goes in.

Step 4: The Scan — A Camera Instead of a Tray

The scanner is about the size of a large marker. The dentist moves it slowly over your teeth. It sprays a tiny amount of air and water to keep things clear. You'll hear a quiet fan sound. On the screen, you watch your teeth appear in 3D.

Most scans take 2–4 minutes per arch. The scanner captures:

• The tooth that was prepared
• The teeth above or below it (so the crown bites correctly)
• How your upper and lower teeth come together

If the dentist misses a spot, they just scan that area again. No need to start over.

Patient tip: The scanner is completely safe. It uses visible light — no radiation, no X-rays. You can open your eyes during the scan.

Step 5: Designing Your Crown — On a Computer Screen

After you leave (or while you wait, in a same-day clinic), the scan file goes to a computer. A dental technician or your dentist opens it in design software. The software builds a 3D model of your tooth and proposes a crown shape based on the teeth next to it and the tooth above it.

Then a human being refines it:

• They trace the edge (margin) exactly where your dentist prepared it.
• They shape the chewing surface to match your bite.
• They adjust the contact points so floss passes correctly.
• They check that the crown doesn't hit too hard when you bite down.

This design step usually takes 10–20 minutes for a single crown.

Step 6: Choosing the Material — What Your Crown Is Made Of

Your dentist chooses the material based on where the tooth is and how much force it takes:

Your dentist will explain which material they recommend and why. Both Emax and zirconia are metal-free and biocompatible.

Step 7: Making the Crown — Milling or 3D Printing

Once the design is finished, the file goes to a milling machine. This machine looks like a small box with a spinning bur inside. It carves your crown out of a solid block of ceramic — the same material your crown is made of.

Milling takes 5–20 minutes. When it's done, the crown comes out looking like a rough tooth. It's not ready yet.

Some clinics have a 3D printer instead. Printers build the crown layer by layer. These are more common for temporary crowns and models than for final restorations, though that is changing.

Step 8: Firing and Finishing — The Oven Step

Ceramic crowns need heat treatment:

• Zirconia: Goes into an oven at about 1,500°C (2,700°F) for 7–12 hours. This makes it incredibly strong.
• Emax: Goes into an oven at about 840°C (1,550°F) for 20–40 minutes. This gives it final strength and color.

After firing, the crown is polished with special pastes and wheels until it feels smooth as glass. A well-polished crown is easier to clean and gentler on the tooth it bites against.

Step 9: Checking the Fit — Try-In

Before cementing, your dentist tries the crown in your mouth. They check:

• Does it seat all the way down?
• Does it touch the right spots when you bite?
• Can you floss between it and the next tooth?
• Does it look right to you?

If anything is off, they adjust it with a fine bur or polishing strip. This takes 2–5 minutes. Only when everything is perfect does cementation happen.

Step 10: Cementing — The Final Step

Your dentist cleans your tooth and the inside of the crown. Depending on the material, they may etch the tooth, apply a bonding agent, or use a special cement that glues the crown in place.

The crown is seated with finger pressure, excess cement is removed, and a curing light hardens the cement (if it's light-cured). You bite on a cotton roll for a minute to hold it in place.

That's it. Your tooth is restored.

Why Digital Crowns Often Fit Better

Digital impressions don't distort the way impression material can. There's no pouring step where bubbles form. The margin is captured optically, not by material flow. Studies show digital impressions have equal or better accuracy than traditional impressions for single crowns and short bridges.

Patients also report:

• Less discomfort during the impression step
• Fewer appointments (same-day in many cases)
• Better ability to see and understand their treatment

What Could Go Wrong — And How It's Fixed

Questions Patients Usually Ask

Does the scanner hurt?
No. It's smooth and rounded. It doesn't touch your gums hard.

Is the crown as strong as a lab-made one?
Yes. The material is the same. The difference is in how it's made, not what it's made of.

Can I eat right after?
Yes, once the cement is fully set (usually within an hour). Your dentist will tell you.

How long will it last?
Digital crowns last as long as traditional crowns — typically 10–15 years with good care.

Final Word for Patients

Digital dentistry doesn't replace your dentist's skill. It gives them a better tool to use that skill. The scanner, the computer, and the mill are all helpers. The person who diagnoses your tooth, shapes it, checks the fit, and cements it — that's still your dentist, using judgment that no machine can replace.