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Dental Crown

dental-crownThe primary task of dentistry is to restore the natural beauty and aesthetics of the denture. In this naturalness, there are not only the location of the teeth and the preservation of the chewing ability, but also the colour, shape and even transparency of the tooth. Today’s modern and up-to-date dental procedures are able to perfectly model the dentures that fit the existing teeth of the patient, and bridges to replace multiple teeth. One of these tools is a metal ceramic bridge with porcelain teeth.

Why is the bridge needed?

For natural teeth, the root wears the chewing power that puts loads of 50-60kg cm² on the tooth root. If there is no root to overcome the lack of teeth, the dental bridge takes over this role and replaces the tooth root. Most commonly, the tooth (teeth) on the two edges of the tooth loss are abraded, forming a small shoulder to protect the gingiva and fixing the denture bridge on these pillar teeth adhesive. The bridge design divides the chewing strength that reaches the bridge. To replace a tooth, it is enough to abrade the two extreme teeth to secure the bridge of the three teeth. If there are more missing teeth, then in order to better distribute the load, it may be necessary to abrade several adjacent teeth, since after the cemented bridge these teeth and root canals take over the bridge load. The material of the crown bridge of porcelain tooth can be made of metal, nickel-free cobalt chromium, it can be alloyed titanium, or made of gold, and a zirconium frame can be made with zirconium frame CAD/CAM technology based on the imprint.

When do we recommend a metal ceramic bridge?

The metal ceramic bridge with porcelain teeth is the perfect solution when the patient does not want an implant, but he misses more teeth beside each other. In this case, the best solution is to abrade healthy teeth next to missing teeth (these will form the pillars of the bridge) and fix the completed bridge on these abraded teeth. If only the root of the teeth used in the pillar is intact and usable, then a pin-tooth is placed, and the bridge is fixed to this pin. After abrading the teeth as pillars of the bridge, we make a temporary crown, so our customers do not have to miss their teeth until the final bridge and crown are ready. At the porcelain covered crown, we make the imprint of the teeth and then the metal, nickel-free cobalt chromium frame is made based on this. This metal frame carries or distributes the force acting on the teeth when chewing. The elements of the metal frame are placed in the porcelain teeth that completely cover the metal (so it is porcelain covered). After the metal frame test, the teeth on the metal bridge are put to test. If all is fine, then the porcelain gets a glossy layer and is burnt with the metal. Then, only the bridge must be placed on the abraded teeth that function as a pillar.

When do we recommend zirconium framed crowns?

Zirconium framed crowns are made of zirconium dioxide with CAD/CAM technology and perfectly fit with micrometre precision to replace old teeth. They have the advantage that they do not contain metal, thus providing excellent dentures for metal allergies and perfectly fit to the shoulders of the abraded teeth. Traditional metal ceramic crowns provide a very precise fit (with a tolerance of 30-40 micrometres) as well, but the zirconium bridge is exceptionally precise, accurate to 3-4 micrometres, due to computer processing. The price of these bridges is, therefore higher than the price of porcelain covered crowns. Zirconium has a high tensile strength and has good chewing strength without the risk of fracture or crack. Because of these good properties, the front teeth and chewing teeth can be replaced by zirconium bridge-based porcelain teeth. The zirconium crown only acts as the frame (as metal in metal crowns) but because it does not pass the light, the teeth are made of porcelain to the zirconium crown, so the end result will be perfect. The resulting zirconium bridge will be attached to the abraded pillar teeth. The natural tooth at the beginning (chewing surface) is almost transparent, almost completely passes light, while towards the gingivae it is darker burst white. Dental porcelain has similar properties, so it is great to use for prosthesis. When replacing teeth, the most important aspect for the existing tooth or root is the perfect closure on the edges of the gingiva line. If the dental prosthesis does not close completely, then bacteria and food residue may be trapped, which will cause tooth under the crown to deteriorate and decay. If the edge of the crown desists then it will be difficult to clean the tooth that can result in tooth decay. Tooth decay formation can cause periodontal disease, which can lead to loss of teeth or other unpleasant (pouch formation) dental disease. When abrading the tooth, a small gingival shoulder is formed in the tooth material. The edges of the fixed crown seat on these shoulders, so they do not press the gingiva. The older method of preparation of the tooth crown suppressed the gingiva, which could be coloured purplish and often inflamed. Thanks to the modern shoulder abrading, the gingiva stays healthy pink and the whiteness of the tooth will give the natural beauty of the smile.

When do we recommend the ceramic crown?

The transparency, light transmittance, hardness, and density of the tooth is best done by the ceramic, porcelain. Porcelain is an ideal material from which we can make such a substitution that is even from a close look, does not look like a false tooth. Porcelain has an appropriate hardness, but it is resistant to the effects of chewing power, its surface is beautiful, it does not discolour, it is easy to keep clean, and finally it can be repaired the same as the traditional tooth, through the porcelain crown either a root treatment can be carried out or the glanced off porcelain can be repaired without a trace. The porcelain crown is used for front teeth, its frame structure does not contain metal, so completely light-transmissive teeth can be created from it compared to porcelain covered metal bridges. Its disadvantage is that it is not suitable to make chewing teeth, since porcelain is more vulnerable compared to metal bridges. Porcelain crown can be used to replace a front tooth. The porcelain crown can also be based on zirconium, in this case zirconium will be the carrier of the porcelain tooth.

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