Zirconium in dentisrty Would You like to change Your old , not so pleasing, crowns to nicer ones? Do You possibly have metal allergy and You can’t have metal prothesis? The traditional metal crown is strong, but its grey or gold metal frame caused a lot of proplems during the last decades. Among these we can mention the more and more typical metal allergy and the not so pleasing outlook. The metal frame of the traditional metal ceramic crowns doesn’t let light through , therefore the transparency of crowns made by this method is seemingly very different from natural teeth.
Zirconium and its use in dental practice. If we take a look at the well-known Mengyeleyev’s periodic table, we can find zirconium at the 40th place. This element is also called zircon. It is a very hard and solid material, which can cut even steel. It is chemically a very resistant material , only concentrated vitriol acid can melt it. By taking up oxigen (O2) zirconium (Zr) becomes zirconium-dioxid (ZrO2), which is the basic of almost every zircon-product. Zirconium-dioxid is a top-quality ceramics which has been used for decades , for examle at making artificial hip-prosthesis. In today’s modern dentistry the zirconium-dioxid’s (zircon) dynamic development and spread can be seen , because it is remarkably many-sided, strong and aesthetically perfect. Today to our knowledge zirconium is the most modern and highest quality dental material. The reason, why it has started to spread only in the last decades in dentistry, is that making zirconium-oxid dental prothesis needs a very special so called, CAD/CAM system, so traditional dental labs are not suitable for making it. It started to spread in the 1990s when the so called CAD/CAM systems appeared. Preparation of zirconium-oxid is possiple only with the use of this computer system. If You want Your dental prothesis to be like Your original teeth , You should ask your doctor for a unit or crown made of zirconium. Because zirconium can be colored to match the healthy teeth’s color nearby. The steps of making zirconium prothesis are:
a precise plaster-cast is made of the impression of the teeth
The dental technician puts the plaster-cast into a special scenner, which transforms each and every point of the sample into a picture element and loads it into the computer
The dental technician describes gaphically the frame of the later prothesis, creates the size and the form etc. on the computer.
According to the information given the robot controled by a computer will carve the wanted frame with micrometeric precision out of the zirconium-oxid block.
The dental technician builds up the normal covering ceramic onto this frame layer by layer, colors it and forms it according to the needs of the patient and the doctor.
The doctor cements the perfectly pleasant and lifelike prothesis to the prepared post.
You should choose a solution for replacing tooth gap (edentia), where there is some kind of frame material under the porcelain covering. Solutions without any kind of frame material, such as press-ceramic, aren’t long-lasting, they are vulnerable and can break easily, although they are esthetically excellent. The transparency of zircon (metalfree) prothesis is natural, light can pervade through it as much as through original teeth. A well-made zircon crown is difficult to recognise even for a specialist. ADVANTAGES
Crowns , units don’t contain metal, there is no metal allergy
Their color is the same as original teeth’s
It can be colored to match the healthy teeth’s color nearby
Its biocompatibility is the same as gold
4 times better mechanical solidity. Due to the strong frame a many-part unit can also be made
There is no greyness at the gums
Because of CAD – CAM technology there is great precision, so the chance of secondary decay is minimal.
There won’t be gingivitis or recession of the gums next to it
It doesn’t conduct electricity, so You won’t have metallic taste, galvanization, and melted metal compounds in the saliva, in your mouth any more
It protects against inconvenient sensitivity of cold / warm
It is tissue-friendly, it doesn’t cause allergic reactions
It needs ’shoulder’ preparation of the tooth, so there won’t be any gingivitis or recession of the gums
When do we recommend zirconium crown?
– to change old metal-ceramic crown whose ’edges are grey’
– for root canal treated, discolored tooth
– for tooth strenghtened by metal post
– when having tooth gap to make a pleasant unit replacemnet
– in case of tooth/dental implantation
Zirconium crowns, units Their esthetical advantage is due to the fact that they don’t contain any metal. The spreading of light in the unit/prothesis and in its surroundings is almost the same as in original teeth.