Description of the NORITAKE synthetic ceramics
Two methods are known for producing dental ceramic raw material:
As it has turned out from the title, NORITAKE has chosen the second possibility for producing ceramics. This porcelain is produced from first class synthetic substances in line with the Japanese JIS standard. Due to this synthetic technology we get a ceramic substance, the colours, the coefficient of thermal expansion, and the stable material structure of which - in contrary to natural ceramics - endures several burnings without colour changes, cracks, or considerable deformation.
Concerning its hardness very close to that of natural teeth, this is one of the softest ceramics in the market of high-melting ceramics. This is a very important feature in high-standard patient-oriented dentistry since by using this ceramic material the fast abrasion of antagonistic teeth and later mandibular joint problems can be prevented. Besides, it is much easier for the dental technician to work out the prosthesis.
Its field of application is unlimited since it can be used not only for conventional metal-ceramic replacements but also for Jacket crowns, ceramic inlays/onlays, or ceramic shell (Lamina, Veeners).
There is no restriction in metal selection since it can be used with precious metals and base metals alike.
We were among the first in Hungary to buy the system which had already worked in the USA for eight years, by the application of which more aesthetic inlays and onlays can be manufactured, or even inlay bridges or three-member metalless bridges.
We use a special polyethylene fibre in the bridges to prevent breaking. The big advantage is that its thermal expansion and abrasion are identical with that of the natural teeth i.e. it reacts to various physical and chemical influences like your own teeth.
Due to the three various processes of polymerisation (light, heat, pressure) the rate of polymerisation is very high (98,5%), therefore, no free monomer remains in the material to irritate the soft tissues in the mouth.
On the basis of my experience I do not propose the use of Belleglass in the front region since its light absorbing capacity is not as good as that of your own teeth or of porcelain. It is acceptable for the lay eye but subject to criticism by professionals.
In March 2003 I was among the first to work with skeletons made of zirconia (zirconium dioxide). By getting familiar with the advantages and disadvantages of various technologies I gathered much experience on working with zirconia and, as a result of this, I decided to start working with a system supported by industrial background (development, manufacturing). The advantages of this include very precise closing at the edges, excellent material quality, no cracking etc. In other words: constant quality!
Various firms advertise nowadays and make replacements from different materials by means of different technologies. The primary material is very crucial since "zircon" as technical term includes a variety of substances and not even dentists or dental technicians know exactly what is behind them. This means that it is very important to check up the references of the substance concerned, the way it has been produced, and its exact composition before you make a choice. Otherwise you may face big surprises in the course of application.
A big advantage of computer-made zircon skeletons is - besides the lack of metal - the very high bending strength (1200Mpa), due to which the prosthesis is unbreakable by normal use. I plate the zircon skeletons with the Noritake ceramics called "Cerabien CZR".