All-ceramic crowns: ceramic on zirconium oxide
An open and beautiful smile, straight teeth is definitely a business card, emphasizing the person’s status no less than an expensive car. Prosthetics crowns – the most advanced method of restoring lost or damaged front teeth. To motivate the patient to such a structure, must be the most accessible and detailed explanation of all the advantages and nuances of the procedure. Unfortunately, the patients of the dentists and orthopedic surgeons are increasingly common young people, dissatisfied with their smile line in connection with the trauma or lost teeth due to hereditary diseases. Not wanting to associate themselves with people of advanced age, these patients try to choose the most aesthetic and durable option in dental rehabilitation.
Indications for all-ceramic
- The lack of a front tooth;
- A major restoration on anterior teeth;
- Recovery after fracture of the crown;
- Unsightly appearance of the front teeth private;
- Correction of the dentition.
The choice of material for dental prosthetics that is the front group due to the fact that the ceramic mass is strong, but not strong enough to withstand the chewing Department. That is, despite long service life, the operation of such bits should be gentle and thorough care.
Undoubtedly, the all-ceramic crown on front teeth is the ideal way of prosthetics, perfectly imitating your own the enamel and dentin of the patient. Light falling on a surface is refracted and reflected exactly the same as when getting on your own enamel. Color over time does not fade the paint under the layer of frosting will keep the original appearance, does not bind with the dye and does not accumulate in the plaque due to an absolutely smooth surface. Exactly porcelain crowns are competing with the most popular among patients with metal because the metal frame will not give the gums a nasty, unnatural shade of gray, does not cause allergic reactions – are completely inert to the body tissues. Tight and accurate fit to their own fabrics, and created doctor the ledge prevents further tooth decay and protects the gums from pressure and ischemia. No dark metal edges eliminates the need to deepen the crown under the gums, allowing to avoid its retraction.
Since there is no need to intonate the ceramic layer in the cervical part, eliminated the chipping of the material.
Fabrication of metal-free design
The technical part
Made ceramic crown or bridge from the ceramic mixture by pressing. For this first model a wax pattern which is then replace the porcelain mass. On the polished crown then applied a special paint to mimic the color of natural teeth of the patient, the next step is roasting. As in the case of metal-ceramic dentures, the doctor may invite the patient for a fitting, to ensure that the resulting color is perfect. At this stage there is still a possibility to adjust it. The final stage is to apply the glaze to give a natural enamel gloss, another firing in the kiln.
The finished product is virtually no need to adjust, adjust the shape as modeling a dental technician acquainted with the models of the jaws and created crowns with the features of the malocclusion of the patient.
The doctor part
As a rule, the patient gets an appointment to the podiatrist with the treated teeth, and removed non-viable roots, without dental plaque, that is, its polst mouth sanitized. The doctor will determine whether there is a need and the possibility to use metal-free design for replacement of defects of the front teeth. Moreover, a missing tooth can be replaced as a crown on the implant and the intermediate part of bridge prosthesis.
If your own teeth are preserved, but need coverage crowns, the doctor grinds the enamel on the thickness of the crown (in average about 2 mm). Then, just removing the gingiva with the gingival retraction cord thread gets the impressions of the jaws, bite registers and transmits the data thus obtained to the lab. On the same day the doctor together with the patient, determines the color of the future crown with the help of a special set of dial colors. To color took place as efficiently as possible, it is recommended to use the natural daylight, avoiding direct sunlight.
When choosing a prosthesis by the implantation, the patient goes to the surgeon, where he installs the titanium implant and wait for its fusion with the bone tissue. This period can last several months. Then the orthopedist abutment (a metal analogue of the machined tooth stump), takes a cast, and then commits made crown.
Because it is usually on the front teeth, no patient wants to wait for making crowns or engraftment of the implant as long term. Therefore, in most cases, the patient is given a temporary plastic crown, or removable acrylic cosmetic plate. These methods hide the defect comfortable but extremely unreliable, so in anticipation of making a full denture, the person is forced to follow a strict diet and be careful about fabricated construction.
Another progressive method is metal-free ceramic crowns on zirconium oxide. This method is referred incorrectly to all-ceramic restorations. However, if we turn to the periodic table, it is easy to see that the chemical element Zirconium is in it, as metal and dioxide – a compound of the metal with a certain amount of oxygen (oxidation). Despite belonging to the group of zirconium metal, produced from it the crown give excellent results, and apparently the material is very reminiscent of porcelain.
The manufacture of zirconium prostheses are automated, an impression of the jaw is scanned, to build digital three-dimensional model and the computer program itself simulates the future design. Then, on the principle of «cut off all unnecessary» milling machine grinds perfectly suited to the patient a crown or bridge.
Unlike ceramics, zirconium oxide surpasses it in strength and enables the prosthesis chewing teeth, without forcing the patient to limit yourself when eating. The service life of these products is much higher than that of ceramic.
A significant disadvantage of the technology is not always possible to convey the optical properties of natural teeth. That is why there are combined crowns, where the Zirconia is the frame for strength and perfect fit to the remaining tooth tissues and the porcelain mass as veneers give the tooth a natural, original appearance.
Care metal-free constructions
Your crowns last a long time, you should regularly visit a hygienist to ensure professional isdi and routine inspection. Also, be sure to periodically appear and podiatrist that he noticed the possible negative changes in its initial stages and managed to prevent complications. You need to clean the oral cavity as well as before the appearance of crowns, regularly and thoroughly using a toothbrush, toothpaste and floss.
The success of the prosthesis is the integrated approach of the dentist – orthopedist. This means that you need not just to solve the aesthetic problem, but also to hold rational dental prosthetics, which, perhaps, the patient has no complaints. The fact that uncorrected abnormal bite or the lack of a large number of teeth may lead to overload installed in the front section of the structure and lead to the destruction of the supports under it. In some cases it is necessary to cover the crowns of the teeth the opposite side as ceramics and zirconium do not have tendencies to abrasion, and own enamel at the irrational approach will decrease twice as fast.
Porcelain has long been firmly established in the niche of dental prosthetics and one of his assignments is the production of half, veneers and inlays. These structures also serve to restore, as a rule, the front of the group, i.e. incisors and canines. The method of manufacture practically does not differ from that described above. Readings are determined by the number of own tissue intact, healthy area of the enamel and dentin on the biting surface of the tooth or cutting edge.
Often patients abandon the method which, literally, has no contraindications and restrictions in favor of a simple metal or the usual metal-ceramic crowns only for one reason – price. Indeed, the technology is expensive and time-consuming, but a beautiful, healthy smile is often a beneficial addition to your own success.