E-max ® metal-free ceramics is the best option for dental prosthetics with crowns, veneers or bridges, if you want them to blend in as much as possible with adjacent teeth in color and transparency. The manufacturer of this material is the company "Ivoclar Vivadent" (Liechtenstein).
In this article we will talk about two of the most inexpensive versions of dental prosthetics - plastic and metal-plastic crowns. Plastic crowns in dentistry are not widely used due to their low strength and short service life, which is why they are mainly used only as temporary ones.
An artificial crown (Fig. 1) is a tooth prosthesis that restores its anatomical shape, aesthetics and chewing function. Single crowns are used to strengthen heavily damaged teeth, and according to the rules, if the crown part of a tooth is destroyed by 1/2 or more, its restoration should be carried out no longer with a filling, but with a crown.
The one-piece crown is a metal crown made of cobalt-chrome alloy using one-piece casting technology. This method of manufacturing assumes that the entire structure is molded all at once, that in the case of manufacturing solid-molded bridges, it completely eliminates the need for soldering crowns to each other.
Bridges - bridges - are fixed structures that are used to restore missing teeth. Each bridge consists of a certain number of artificial crowns, united in a single whole. Such prostheses are fixed either on the adjacent teeth or on the implants (Fig.
Zirconia crowns are a more aesthetic alternative to metal ceramics during prosthetic dentistry. They are made of a very strong material - zirconium dioxide (ZrO2), which is at least 2-4 times stronger than traditional denture ceramics, for example, porcelain. In contrast to metal-ceramic crowns, zirconia crowns do not have a metal frame inside, which allows them to be made more similar to real teeth.
Metal-ceramic crowns (metal-ceramic) is the most successful compromise between durability, aesthetics and cost for dental prosthetics. They occupy an intermediate position between expensive metal-free ceramic crowns and ordinary metal crowns. Each metal-ceramic crown has a strong metal frame inside, lined with a ceramic mass on the outside (Fig.
When prosthetics of the front teeth, patients always place high enough demands on aesthetics. The most important of them - the crowns on the front teeth should not be visible on the background of their own teeth, matching them in shape, color and transparency. Today, there are only a few aesthetically acceptable options for prosthetic front teeth.
The choice of crowns for dentures usually occurs between metal ceramics and metal-free ceramics. However, if the patient makes a choice in favor of metal ceramics, the dentist immediately suggests choosing its options. This can be either standard metal ceramics or metal ceramics of enhanced aesthetics with the so-called “shoulder mass”.
Most problems with dental crowns are due to two reasons. Firstly, because of medical errors that lead to inaccurate fit of the crown to the tooth in the neck, and as a result - to ingress of food and bacteria under the crown. As a result, tooth decay begins under the crown, i.e. caries develops.
Making and installing a crown on a tooth is a complex procedure consisting of many stages. In this article we will talk about the many subtle points that affect the aesthetics and life of your crowns. These moments concern both errors when choosing the type of crowns by the patient himself, as well as mistakes made by dentists during the manufacturing stages.