Crowns

KINDS OF DENTAL CROWNS

Dental crowns orthopedic constructions, which are made by laboratorial way.

The crown covers tooth from every quarter, and fixed by cement. Tooth crown becomes new outside surface of tooth. Tooth crowns are way of restoration for strongly destroyed tooth, and in such way the shape, function and face of tooth are restored. The crowns strengthen lacks of tooth tissues.

Tooth crowns are made of metal, ceramic or its combinations metal-ceramic crowns.

Metal-ceramic crowns.

Metal-ceramic crowns are made of ceramic and metal. For the first there are made metal framework, and then it is covered by ceramic. Thats why metal-ceramic crowns look naturally.

The defect of metal-ceramic crown is that it is not so esthetic as ceramic crowns (crowns without metal).

Metal-ceramic crowns often have dark tint near edge of gum.

Metal-ceramic crowns are ideal for restoration of masticatory tooth.

Ceramic crowns without metal.

Ceramic crowns without metal are good alternative for metal-ceramic crown. Whole ceramic crowns have better esthetics, they are more semitransparent. For crowns without metal, the framework is fitted to tooth, and then its covered by ceramic mass.

Ceramic crowns without metal are ideal for frontal teeth restoration. They arent recommended for restoring of posterior teeth.


CERAMIC CROWNS WITH ZIRCONIUM CERCON

New ceramic metal (ceramic without metal), which is very durable, esthetic, biocompatible with tissues of cavity. Zirconia oxide white, non-transparent material. The framework is made by method of computer milling, and this support precision. Durability of framework is 600 MPa.

The first, framework is made of zirconium (according to tooth color), then its covered by ceramic mass.

  • It is durable 50 % more than ceramic crowns without metal.
  • Dental bridge can be made of zirconia ceramic.
  • There is no any metal edge in gum area.
  • It is ideal for group of frontal teeth.
  • Splendid esthetics.
  • It doesnt cause allergy.

Crowns with framework of zirconia dioxide

Better esthetics because of white zirconia oxide.

  • Optimal imitation of natural tooth color.
  • Thanks to exclusive durability, zirconia crowns are long-lived.
  • High stability.

Ceramic system Ips Empress

IPS Empress is ceramic system without metal, what means pressed glassed ceramic.

IPS Empress ceramic is well alternative for metal-ceramic crowns. IPS Empress system has heightened content of leucite crystals that increase its durability.

IPS Empress ceramic is one of the most durable systems. Firstly the technician models crown by wax (restore exact shape) on the gupseous model (exact copy of patients teeth). Then crown is pressed in special oven with high temperature. Then its colored or covered by other ceramic and burned. The result is restored, individual, esthetic tooth with al natural features.

Reasons.

  1. Single crowns for frontal teeth.
  2. Inlays for masticatory teeth.
  3. Side plate for masticatory teeth.
  4. Veneers.

Advantages of IPS Empress ceramic.

  1. Excellent esthetics. IPS Empress hasnt metal frame and opaque layer.
  2. Perfect conformity.
  3. Full imitation of shape and color of natural teeth.


VITA IN ALUMINIA CROWNS

Nowadays InCeram Alumina system is one of the most popular among esthetic system without metal. InCeram Alumina crowns is made of aluminum oxide. The framework of InCeram Alumina is aluminum oxide. Aluminum oxide is white, semitransparent material, which is made by computer milling, that confirm its high accuracy. Aluminium oxide keeps high level of translucence in the ceramic crowns. Durability of alumina framework allows making dental bridges. The durability of framework is 400

Main readouts.

  1. Usually its used for frontal teeth.
  2. Restoration, if patient has allergy on metal.
  3. If there is high esthetic requests.

Advantages of InCeram Alumina crowns.

  1. High biological compatibility. It doesnt cause gingival irritation.
  2. It doesnt cause allergic reactions.
  3. InCeram Alumina crowns have perfect esthetics. Crowns have high level of translucence (the main function of tooth enamel).
  4. It doesnt have dark metal edge near gum, as there is no metal substructure.

PROCERA CROWNS

PROCERAR AllCeram system is made of aluminum ceramic, which is shaped by pressing way.

PROCERAR AllCeram system is applied for single crowns making for frontal teeth, and also for inlays and veneers.


The durability of PROCERAR AllCeram ceramic is 600 . Thanks to this method there is possible to get 99,5% of ceramic density.

Advantages of PROCERAR AllCeram crowns.

  1. High biological compatibility. It doesnt cause gingival irritation.
  2. Procera crowns have perfect esthetics. Crowns have high level of translucence (the main function of tooth enamel).
  3. It doesnt have dark metal edge near gum, as there is no metal substructure.


TEMPORARY CROWNS

Temporary plastic crowns are used in prosthetics for making period of permanent crowns or bridge. Though they are temporary, but their functional value is very important. This stage of prosthetics mustnt be ignored.

Temporary crowns are used:

  1. For prevention of possible painful reaction, when abutment teeth are lively cut (without pulpless).
  2. For prevention of gingival overgrowing, when abutment teeth are cut with ledges.
  3. For prevention of shifting of prepared teeth.
  4. And at last there is esthetic aspect. As nobody wants to show his cut teeth.

Temporary crowns are made of plastic. Nowadays there are two methods of temporary crown makings:

1.Temporary crowns are made into the mouth cavity.
Before to make tooth preparation, the dentist takes tooth prints, and gets exact tooth configuration till preparation, then tooth is prepared for permanent crown. When preparation is finished, the dentist floods special liquid plastic into first print, and wears prints on prepared tooth. In few minutes, when plastic is hardening, the dentist takes print and the temporary crown is ready. Then the dentist fits the crown to tooth, checks the bite, polishes and fixes it with temporary cement.

2.Laboratorial crowns are made in the tooth laboratory.
The dentist prepares tooth, takes prints and sends them to tooth laboratory. Tooth technician founds gypseous model and makes temporary plastic crown. Then the dentist fit temporary crown to tooth, checks bite, polishes and fixes with temporary cement.

Procedure of crown making.

  1. Preparation tooth for crown.
    At this stage the dentist prepares tooth, takes prints and gives it to tooth laboratory. Then dentist wears temporary crown on the prepared tooth. The technician makes gypseous model and makes crown on the model.
  2. Crown trying on.
    During second visit, the dentist try the crown on, check its shape, color, and fitting it.
  3. Crown fixing.
    The dentist fixes crown with special cement.



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