Dear readers MiraSovetov you everfaced with the need to cover the crowns of the teeth? I think that this issue of concern to many people today who have received a negative experience associated with prematurely removed teeth. Many of you probably do not have quite the aesthetic appearance of teeth at birth or acquired, conspicuous large defects on the surface of the tooth. All of these problems can be eliminated by placing aesthetic crowns. Selection of suitable individual crowns held a dentist-orthopedist during consultation, but you need to have information about the characteristics of widely used in crowns, as well as their positive and negative properties. This information will save you from unnecessary problems at the reception, reduce the fear of the unknown, and will protect against fraud on the part of the dentist.
What materials serve as the foundation for crowns?
Dental technicians on special models thatThey are exact replicas of the dentition, made crowns. As a basis for the manufacture of commonly used metals, porcelain, metal alloys, composite or acrylic polymers, as well as combinations of these materials.
Metal stampings crowns. This type of crown is made of stainless steelalloys, gold or plastics. Stainless steel grade 1Kh18N9T long been used to manufacture extruded crowns, as well as their modifications. It is because of this alloy in the factory producing punching liners, which are cylindrical caps.
Gold crowns are made of stampedsamples of gold - 900. This test reflects the content of gold in the alloy - 90%. For cutting tooth edges or chewing surfaces using gold 750, as an alloy with reduced gold content less soft and is not subject to deformation when biting or chewing.
Metal-ceramic crowns. This is one of the most popular nowdesigns, is a metal crown with ceramic facing. The crown is made in the dental laboratory from different alloys. To use it, and NHS CJC - a base metal alloys representing cobalt and chromium compounds, as well as nickel and chromium. For metal-ceramic technology can use the gold-palladium alloys. The use of noble metals gives certain advantages fabricated crowns.
Ceramics. One name says it all. These crowns, indeed, have done without a metal frame, and applied only to ceramics.
Ceramics based on zirconium oxide - one of the most sought after for the manufacture of crowns "metal-free".
This is due to the fact that the material forms a number of positive properties of crowns.
Thus, we have listed the popular crownwhich are used by dentists, podiatrists now. This is certainly not an exhaustive list, but to form a general idea of modern materials for the manufacture of crowns, which are in great demand, it is quite enough.
Stamped crown. They are used in cases where a defect in a toothit is impossible to restore any tab or sealing. You can put the crown in cases where there is no confidence in the strength of the tooth, even after careful treatment. The crown can also be a support member prosthetic. Perhaps the use of stamped crowns with pathological abrasion of teeth as well as under various severe forms of non-carious lesions, such as fluorosis and hypoplasia. These are the main indications for use of this type of crowns.
Metal-ceramic crowns. These bits can be used for violationsshape and color of crowns resulting from such pathological processes as:.. caries, cuneate defects, trauma, fluorosis, hereditary abnormalities of form and position of the teeth, etc. With the increased abrasion and with symptoms of allergy to plastic - is the most optimal choice for prosthetics.
ceramics It made for different purposes. It is used to recover severely damaged teeth, crowns on pins and artificial teeth implant.
The advantages of each type of crown
For stamped crownsManufactured from conventional alloysbase metals, the main advantage - it's low price. It is formed from certain drawbacks of this type of crowns. However, the strength characteristics, i.e., the ability to experience considerable loads during many years of operation provides visible benefits stamped crowns. Under the stamped crowns teeth dissected ( "grind") is minimal, unlike its competitors aesthetic. After treatment, the teeth almost always have the option to save the pulp, ie, the "nerve", intact. For preparation for modern types of bits associated with a significant processing of the tooth surfaces, up to the formation of a "cult", in most cases, leave the tooth "living" is not possible. According to many dental practitioners, stamped crowns made and recorded by the technology more durable and operate longer than competitors more aesthetic. In addition, they are light, and in a matter of hours after fixing many patients get used to them as relatives. Such crowns, despite some shortcomings, which will be discussed later, is still set themselves even dentists.
Preferred material for use,Of course, the gold that has unique properties, but now for some reason, not many agencies involved stamped crowns of gold.
For molars, which are far behind in preference stamped crowns of base metal, while for the front teeth, still needed aesthetic crowns.
metal-ceramic crowns They have a number of advantages overstamped crowns. The most important advantage - high aesthetics. Facing porcelain placed on the surface of a metal crown, just picks up the color of the adjacent teeth. Porcelain reflects light, creating the effect of natural enamel.
Also characteristic for metaldurability. If pressed crown can be operated quite tough, bold eating solid foods, the durability of the cermet to observe food hygiene, as can provoke with simultaneous high load cracked pottery.
Cermet, unlike stamped crowns can be placed in the most difficult cases.
This type of crown is one of the mostpopular among the population, especially since every year there is a tendency to reduce the cost per unit due to the high competition among dental clinics.
ceramics It has improved cosmetic properties,since the same degree of refraction of light at the crown and enamel. Unlike cermet on the border of the crown and the gums will not be dark strips of metal, which gives advantages in aesthetics. The risk of allergic reactions in all-ceramic is the minimum, because there is no frame of alloys of different metals, which are most commonly allergic to happen.
Despite the advantages, there are always some drawbacks, which should always be aware of.
For stamped crowns characterized by the absence of more or aestheticslesser extent, depending on the material used. You, of course, have an idea of the so-called "gold" crowns. This is the view of the "stamping" deters many patients, even if it comes to the use of gold for their production. Some embodiments plastics also do not provide the desired cosmetic effect. Allergic reactions to metal alloys are quite common, there are also the effects of galvanic currents in the mouth when using dissimilar metals.
metal-ceramic crowns - A massive crown, requiring mainlyremoving "nerve", ie depulpation. The technology often does not allow to save the neurovascular bundle, as is the "overheating" of the tooth, and the living tissue in the tooth simply dies. After preparation of the tooth under the crown of it is actually only a "cult."
On the possibility of the appearance of dark metal bandnear the edge gums I have already mentioned. This small negative aesthetics. When careless chewing, particularly hard, there may be cracks in the porcelain lining, resulting in spalling.
Own teeth located onopposite side may wear from ceramic crowns on contact. Most types of ceramics have a hardness greater than the hardness of the native enamel.
ceramics yield strength metal. For prosthetic teeth chewing dentists still prefer cermet as possible chipped at the slightest serious load. The cost of these crowns is much higher than aesthetic cermet.
Now you, dear readers of our site, haveview of the currently popular crowns starting from the conventional "stamping" and ending with the non-metal ceramics. Knowing the pros and cons of each type, you can intelligently approach to their own prosthetics or prosthetic their loved ones. "Who owns the information, and control of the situation" - that's my motto in life. I hope that this information will allow you to not make a mistake with the choice best for you crowns. Moving with skill to prosthetic crowns, you will handle your money wisely and not harm their health. All the best!