Dissection of teeth for cermet: technology features
Prosthetic dentistry in modern dentistryoccupies a special and extremely important place. After all, from their damage and the subsequent loss is not insured by anyone. Today, the dental industry offers a huge variety of prosthetic options. Dissection of teeth under cermet, which is not in vain one of the most popular options, has some differences from processing for other types of crowns. The fact is that this method of dental prosthetics organically combines an excellent aesthetic result, reliability, durability and relative cheapness.
A special metal frame making upthe basis of such crowns and assuming the main load during the operation of the teeth, is supplemented with ceramic material, which mainly performs an aesthetic function. So ordered nature, that, perhaps, the most fragile and prone to rapid wear in our body are teeth. Metal ceramics, which is considered the most reliable and durable technology of prosthetics for today, allows to successfully correct this state of affairs.
Prosthodontics, in general, and prostheticsmetal-ceramic crowns, in particular, involves some initial preparation, called preparation. After all, the oral cavity needs to be carefully prepared for such a procedure. Dissection of teeth for cermets has a number of characteristics that are associated with some additional requirements for this method of denture.
By modern standards of dentistry is minimalthe possible thickness of the metal frame should be 0.3 mm and the ceramic layer not less than 0.8 mm. By simple arithmetic action it is possible to easily determine the thickness of a qualitative, durable crown, which equals to a minimum of 1.1 mm. The preparation of teeth for cermets is designed to provide the necessary parameters.
Another goal pursued bypreparatory procedure, - giving the tooth walls a strict parallelism necessary for reliable adhesion to the crown (permissible inclination is only 7%). Otherwise, it may just not be put on. But the main point that distinguishes the preparation of teeth under the cermet is the need to create a special cervical ledge.
This unpleasant procedure is carried out withusing local anesthesia. A qualified doctor dental treatment for cermets is made as sparing as possible. Using a turbine borer (average speed of rotation - 250,000 rpm), equipped with a diamond tip, the dentist is stiffening hard dental tissues. For treatment of approximal surfaces a special separation disc or turbine tip is used, the diamond head of which has a smaller diameter than the ledge created by it.
For chewing surfaces isit is essential to preserve their anatomical shape. The preliminary shoulder, both on the palatine surface and on the vestibular, is created below the gum edge by about half a millimeter. After that, approximal scaffolds are connected to each other, and hard dental tissues are additionally sharpened by the shape of a truncated cone. Then sharp corners are rounded, and on this process the formation of the ledge can be considered complete. The main task of the dentist at the stage of preparation is to prevent overheating of the tooth. Otherwise, the nerve will die. For this purpose, a water-air cooling system is used.
And in conclusion an interesting fact. Dentistry was invented by the Etruscans, who lived on the territory of the modern Apennine peninsula three thousand years ago. And porcelain dentures appeared in the eighteenth century. True, modern dental technology, unlike the techniques of 300 years ago, allows almost anyone who wants to make a white-tooth smile a Hollywood star.