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Porcelain Crowns

A porcelain crown is a basic rehabilitative tool that serves as a replacement for the tooth’s natural crown in order to improve both function and aesthetics.

When will we choose a porcelain crown as a rehabilitative solution?

  1. When the crowns of the teeth have been extensively damaged by caries and subsequently undergo a root canal, they will be repaired with a porcelain crown. In this case, the crown serves to restore function and aesthetics, but also to protect the remaining tooth material following the caries damage.
  2. Teeth that have been weakened due to previous extensive restorations.
  3. Rehabilitation of worn teeth to restore function and aesthetics.
  4. As part of a rehabilitative plan to correct improper alignment of the teeth, such as crooked teeth or teeth that have descended extensively.
  5. When a tooth is missing, the adjacent teeth may be used to support a bridge (several connected crowns) to fill in the missing tooth (hanging unit).
  6. Rehabilitation of missing teeth, on top of implants.

Types of crowns:

  1. All-metal crowns - A crown made entirely of metal without any porcelain. Used to restore function only, usually in posterior areas, in cases where there is not enough room for a porcelain crown.
  2. Porcelain-fused-to-metal crowns - The crown is composed of two parts: a metal shell on which is fused a porcelain veneer. The metal shell is made to fit the shape of the sharpened tooth. Various types of metal alloys may be chosen to make the metal shell (base, semiprecious or high noble). Above the metal shell, a special oven is used to fuse the porcelain so that on the outside, the tooth will look more natural. There are cases in which the metallic edges of the crown are exposed over time because of their reaction with the gums, producing a slightly grey shadow.
  3. Full porcelain crown - These crowns do not contain any metal at all.

There are various types of full porcelain crowns; we will review two of the main types:

Zirconia crowns - Zirconia is an oxidized form of the metal zirconium. In this form, the material assumes ceramic, aesthetic qualities. On one hand, zirconia is hard and strong like metal, and on the other hand, it matches the natural tooth color. To prepare the crown, a shell that is as thin as possible is created from zirconia to fit the shape of the tooth, to which porcelain is then fused. Zirconia crowns are known for their highly aesthetic appearance and their excellent compatibility with the gums. Over the past few years, technology has developed to enable the creation of a crown that is made entirely of zirconia, a monolithic crown (used as an aesthetic alternative to the all-metal crowns mentioned earlier – offering the aesthetic advantage of zirconia without compromising on strength). There are also crowns that are made almost entirely of zirconia and only laminated with porcelain at the front (utilizing the advantages of the strength of zirconia as much as possible).

Example of the use of a zirconia crown

In the case below, the central incisor has undergone a root canal and must be fitted with a crown.
In addition, the patient asked that the spaces between her teeth be closed and the alignment and color be corrected. Therefore, we chose a zirconia crown for the central incisor and three porcelain veneers to obtain the perfect smile.

EMAX crown - EMAX is a type of porcelain which was significantly reinforced during the production process. The result is a material which is aesthetically pleasing and very strong. The entire crown may be constructed with EMAX (monolithic), or the shell can be made out of EMAX and covered with regular porcelain.

Example of the use of an EMAX crown

Done by Dr. Angi Meir. Technision: Ilan Brosh.

Performed by Dr. Meir Angi

Examples of cases of rehabilitation combining an implant with a zirconia crown and EMAX porcelain veneers

Three zirconia crowns and one veneer using EMAX

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