Metal-ceramic crowns are very popular, because they are not too expensive, very durable and aesthetic in appearance. Inside the structure there is a molded frame made of metal with a thickness of not more than 0.5 mm. The product itself is created from an alloy of chromium and cobalt or nickel. In some cases, gold-based alloys are used. They are in considerable demand, because thanks to the natural yellowness of the material, you can get a more natural color of the crown. The finished frame is covered with ceramics in several layers, after which the crown is fired. Thanks to this, the finished product becomes very durable.
General information on cermet
- tooth decay, in which the filling or the installation of special tabs is considered ineffective;
- pathology of the development of teeth;
- enamel erasability;
- defects of crowns, including darkening and change in shape, which is noticeable even in the photo;
- discrepancy between the installed crowns and prostheses aesthetic requirements;
- restoration of 2 or more adjacent teeth.
- metal ceramics allergy;
- periodontal pathology;
- serious defects of the dentition;
- shortened coronal part of the tooth.
- Acceptable aesthetics. This applies to those cases where the prosthetics of the teeth with metal-ceramic, the price of which is quite affordable, is of high quality. However, such crowns inferior in appearance products without metal.
- Durability and long service life, thanks to which the design is very reliable. Its ceramic coating is not afraid of abrasion and caries. If minor chips are found on the surface, they can be removed without removing the crown.
- The need for grinding teeth. The amount of tissue removed depends on the thickness of the crown walls. As a rule, the depth of grinding is about 2 mm. For this reason, for restoration of the front teeth it is better to use veneers, and for chewing - special restorative tabs.
- Tooth depulping. So, due to the significant grinding of tissues, thermal burn of the pulp is not excluded. In this case, after a long period of time, the development of the inflammatory process occurs, which often leads to the need for re-prosthetics. Accordingly, in most cases, tooth pulping and canal filling are performed. This procedure does not apply to molars with a large amount of dentin and enamel. It is worth noting that best to leave a tooth alivebecause it will not become too fragile.
Types of prosthetics
The use of metal ceramics in modern dentistry is very much in demand. So, for the manufacture of crowns today used about 50 types of alloys and 100 varieties of ceramics, which affects the cost of prosthetics.
All metal-ceramic crowns are divided into several subspecies:
- Classic metal-ceramic. Here is a nickel-chrome frame, as well as inexpensive highly mineralized ceramics. Such a product is considered budget. Its benefits are - reasonable price and acceptable aestheticsHowever, the alloy itself is considered highly allergenic. For example, approximately 30% of patients experience an allergic reaction.In addition, there is a high probability of chipped ceramics and blue gums. The cost of such a crown is on average 2.5-4.5 thousand rubles.
- Metal ceramics from an alloy of chrome and cobalt. Such material is considered less allergenic. The design is more durable due to the use of synthetic ceramics. Despite the advantages of this type of crown on teeth price which is about 7 thousand rubles, the probability of blueing gums is not excludedcaused by oxidation of the edge of the frame.
- Metal-ceramic crown with humeral mass. This is the most aesthetic option, created from basement alloy. Chromium and cobalt are most commonly used. The edge of the finished product is resistant to stress, so that the oxidation of the metal is practically not observed.
- Metal ceramics from a noble alloy. Palladium and gold are used to create such crowns. The advantages of the product are durability, aesthetics and non-oxidizability.
Before performing the prosthesis, the tooth is prepared.
- First, experts make an x-ray image, thanks to which it is possible to ascertain that the top of the tooth has no changes. If inflammation was detected, then appropriate treatment is prescribed. In the case when the channels were previously sealed, X-rays help determine the quality of work performed. Sometimes you have to re-perform the filling.
- The next stage involves the execution of the depulpation, that is, the removal of the nerve. In other words, the canal is sealed. This procedure is carried out in case of detection of inflammation. Nerves taken to remove and live in the front teeth.
- If during the inspection a caries or a poor-quality filling was noticed, then appropriate treatment is carried out.
- If the crown of the tooth is destroyed by 50% or less, in the canal neatly mounted pinand then the coronal part is restored with the help of a filling material.
- When the crown is completely destroyed or thin walls remain from it, it is necessary to install a special tab. It ensures the reliability of the design and protects the metal from serious load.
After the preparatory stage, prosthetics begin. First, the tooth is gently grinded. After that the cast is taken. It is used for the manufacture in vitro of a metal-ceramic crown. The process takes from 1 to 2 weeks. During this time, the patient walks with temporary plastic crowns. They help protect teeth from aggressive external factors, and also make the smile more aesthetic.
The cost of cermet
Crowns made of Japanese or German ceramics, as well as high-quality cobalt and chrome alloy, cost at least 6-7 thousand rubles.
Some patients prefer to save. They set the crowns on the teeth worth 4-5 thousand rubles. For the manufacture of metal ceramics cheap materials are used domestic production.
Crowns made of an alloy of gold and palladium or platinum cost from 9 thousand rubles. In this case, the cost of the metal is not taken into account.
If temporary crowns were made for the patient separately, then about 1 thousand rubles are added to the cost of metal ceramics.
The success of prosthetics
For a prosthesis procedure to be successful, a number of factors must be taken into account.
- Preliminary preparation of the tooth. Many patients who have established dentures, often face poor-quality canal filling. At the top of such teeth inflammatory process is often noted, which leads to pain and swelling of the gums. Accordingly, it is necessary to remove the prosthesis and re-treatment. In some cases, this leads to the need for tooth extraction.If the tooth was improperly prepared, then there is a chance that the metal-ceramic crown will break off.
- Professional orthopedist. In the process of prosthetics, much depends on the quality of work performed by a doctor. This is especially true for teeth grinding and impression taking. If the technology has been broken, then a small gap will appear between the denture and the tooth, where food particles and microorganisms will fall. This leads to rotting of the tissues and the subsequent breaking off of the metal-ceramic crown.
- High-quality performance of work by the dental technician. The finished casts are sent to the lab, where dental technician prepares plaster models and simulates the prosthesis itself. The final color and shape of the product depends on the professionalism of this specialist.
Most dental centers with a prosthetic teeth are guaranteed for a period of 1 year. Ceramic-metal crowns themselves will last about 10 years. However, this applies only to those cases where the work was performed at a high level.
Before the expiration of the warranty period, it is necessary to take a test picture of the teeth, even when the patient has no unpleasant symptoms. This is explained by the fact that inflammation often occurs near the roots, leading to the need for treatment and re-prosthetics. If you notice a similar flaw until the warranty is completed, the treatment and installation of the prosthesis will be free of charge. Naturally, it is better to take a picture in another clinic, because some unscrupulous doctors do not want to redo poor work and therefore hide the true state of affairs from the patient.
After installing a metal-ceramic crown, regular visits to the doctor are recommended. Also timely replacement of the prosthesis is importantThat will help to avoid various problems, including splitting or falling out of the product.