A crown is sometimes termed a "cap" or "jacket." A crown will restore a large filling or a cracked tooth to its original size, shape and tooth color. A crown may be recommended after root canal therapy has been completed, as the tooth tends to become brittle and is more likely to fracture. A crown can strengthen and protect the remaining tooth structure and improves the appearance of your teeth. With the advances in technology, we now have the ability to make ceramic crowns with no metal.
To place a crown, your dentist must reduce 1-2 mm of the tooth to make room for it. Your dentist will then use a piece of thread or cord or use a laser to push the gum down around the tooth, to take an impression of the tooth. The impressions are sent to the lab where the crown is made. During that time, you will have a temporary crown. These crowns are usually made of plastic and are made in your dentist's office on the day of your visit. They are not meant to last. If a temporary crown is left in the mouth, the cement eventually washes out and the tooth can decay. At a second visit, your dentist will remove the temporary crown and test the permanent one. Sometimes crowns need additional polishing, glaze or some other adjustment before they are placed. Once the crown is ready, it's cemented to your tooth.
With today's advances in dentistry, there are several options when choosing a type of crown:
- Porcelain outer surface with a metal base crown
- Pure porcelain or composite crown
- All metal crown, which is usually gold
They all differ in durability, strength, appearance and cost.
Because our office can provide a dental crown in a single dental appointment, we do things a little different than other dental offices. We can skip the temporary molds and the time it takes to have a dental lab fabricate your final crown.
1. We start the crown procedure by reducing the overall size of the tooth that's in need of a dental crown. Shaving off existing tooth structure allows for the new crown to fit properly and it also creates a foundation for the new crown to be bonded to.
2. Next, using our state-of-the-art CEramic REConstruction (CEREC) system, we will digitally scan the section of your mouth that has been prepared for the crown. This is done by using a special wand that can be easily positioned in your mouth to ensure an extremely accurate digital representation of the restoration area.
3. We will now be able to see a high-resolution 3D representation of the area and start to design a new crown that will fit perfectly over the prepared tooth. Our patients often love getting to see us create a new tooth for them in real time, right there on the screen.
4. Once the digital representation of the new crown has been created on the computer, we will send it off to our in-house milling machine. We place a block of porcelain that has been color-matched to the shade of your existing tooth into the milling machine and run the program. This amazing machine robotically fabricates a perfect crown restoration that is ready to be placed over the prepared tooth at this time. This crown is the final crown and NOT a temporary crown which means you have just received a new dental crown in a single dental appointment.
These are very aesthetic, bonded crowns. They are mostly used for front teeth because they are the most natural looking type of crown and are often used in "cosmetic" dentistry.
There are many types, but they all have a common feature - no metal. They can occasionally break, but dental technology has advanced far enough to make them quite strong.
The most common type of crown and has a proven track record. PFM crowns are fairly aesthetic and they look like real teeth. However, the margins or borders may appear dark because PFM crowns have a metal substructure with layers of porcelain fired over the substructure. Porcelain is very hard, much harder than natural enamel and may cause excessive wear of the enamel of opposing teeth. Porcelain may break with extreme biting forces.