What is a crown?
A tooth crown is a restoration that protects the remaining part of your tooth that has been damaged, cracked or broken. A crown helps strengthen your existing tooth, so that both the bite function and the aesthetics are restored. Tooth crowns are also called caps because a crown sits like a hat beyond the existing tooth and covers the remaining outer surface of the tooth.
Why do I need a crown?
There may be various reasons why you need a crown:
- If your tooth has been exposed to significant decay or neglect and it is not enough to do a plastic or porcelain filling. It is important to still maintain the bit function.
- If a large part of your tooth is broken because of. such as trauma or excessive fillings, and the tooth can not be built up using plastic fillings, a crown treatment is the right solution.
- If you have a lesion on the tooth and want extra protection, a crown is optimal. Teething lesion may be large-hole teeth (karies), old discolored plastic or porcelain fillings or old crowns.
- If after an extraction of a tooth you have received an implant screw for an implant, replace the lost tooth and install a new crown at the distance of the implant.
- A root treatment weakens the tooth. Therefore, it is often necessary for a crown to strengthen and hold together the weakened tooth.
- If you cut teeth (weariness), your teeth are worn and destroyed. Give the broken tooth a crown can be a good option. However, it can also be a solution to put on plastic and let it worn down, and then repeat the plastic treatment to maintain the natural tooth.
- If you eat a bad diet you may be exposed to acid damage, so that your teeth dissolve so much that the only option is to supply the broken tooth with a crown.
- For cosmetic reasons you can choose porcelain crowns to improve the aesthetics of your smile.
Are all teeth suitable for crowns?
In order to put a crown there should be sufficient height on the currently prepared tooth rest. As long as the tooth is not split along, it is possible to make a crown.
What kind of crowns are there?
The crowns can be made in a variety of different materials. It is exchanged between gold crown, metal ceramic crown (MK crown) and full ceramic crown. There are many different brands and types of porcelain crowns. The cost of production varies according to the material used – the better the quality, the higher the price.
Crowns of gold have for several generations been considered the most durable filling material in the teeth and it is still as long as the regulations are followed. The gold can be worn, so it “gaps” in the crown or in the edges of the post. In that case, it must be replaced. A good article on dental crowns can be found on Göteborg Tandläkargrupp.
Metallic crown (MK crown)
A ceramic crown is an alloy of precious metals and a fusion with porcelain. The precious metal is the innermost, and the porcelain is the outer shell. The color of the crown matches your tan’s nuance. It is a durable solution, but the porcelain / metal bond is the weak joints and may be the reason why the crown does not hold cosmetic under heavy load. If the porcelain is exposed to considerable wear, the metal may become visible.
Full ceramic crown (pure porcelain)
Crowns made of pure porcelain have become more and more popular in dental care. This is due to the cosmetic properties of porcelain, but must be considered shorter durability due to less tensile strength.
- Zirconium crowns: Most used in the joints, since they are dense in color, which may otherwise create a “dead” look in the front.
- Procerakroner: The first porcelain crowns used for the tines. They largely replace the metal ceramic crowns due to the cosmetic properties.
- Cad-Cam crowns: Most refer to the crown being made of a digital image, and then painted. Either the laboratory makes a scan of the impression that the dentist has sent, or the dentist even scans with a digital scanner. The following digital scanners are the most widely used: Cerec, Trios, iTero and Plan-Scan.
- E-max crowns: Crowns made of a particularly strong porcelain under high pressure – either as blocks for Cad-Cam use at the dentist or at the dental laboratory of technicians.
- Empress crown: A squeezed porcelain crown.
- Cerinate: and strong porcelain crown.
- A special prefabricated steel crown is used in child care to hold the tooth in place of pulling the broken tooth out. This is characterized as Rockey Mountain.
How is the treatment process?
- You start with a consultation with your dentist where you discuss all treatment options and enter into an appointment. The first step in the treatment is to prepare the tooth where the crown is to be applied. This is done by cleaning the tooth, removing all lesions and shaping the tooth using a diamond drill (a dental brush that grinds the teeth). The entire session takes place during local anesthesia. The shape of the tooth is pointed so that there is room for the crown to be attached.
- When the tooth is prepared, a print of your teeth is taken – either by conventional or digital printing techniques. A conventional impression is taken by means of a special impression material filled in an imprint. The finished print is then sent to a dental laboratory, which uses the impression to make a crown.
- The color test takes place either at the clinic or at the laboratory technician. It usually takes between 2-3 weeks for the technician to produce the crown. In the meantime, the dentist will adapt a temporary crown – typically plastic crown – to cover and protect the prepared tooth. On your next visit, remove the temporary crown by etching the outer layer of the prepared tooth. This is done to give the tooth (toothpump) a rough surface, so the cement has a good surface to bond (paste) to. Your dentist puts the crown on the dental stool to control function, color and aesthetics as well as edge adjustment. When both you and the therapist are satisfied with the result, the crown is cemented into place.
Most dentists offer digital prints instead of the conventional ones. A digital image is taken from your teeth, which are passed on to the dental laboratory or to the dentist’s own milling machine. If the dentist is a milling machine, the treatment can be done on a visit.