Description of the NORITAKE synthetic ceramics

Two methods are known for producing dental ceramic raw material:
   1. from natural feldspar and leucite; and
   2. from synthetic feldspar made from chemical components and ions.

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.

 

BelleGlass polyglass

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.

Indication:
  - inlays/onlays
  - inlay bridges (Maryland, California)
  - crowns
  - small bridges

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.

 

Zircon

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.

In my work I follow the processes indicated below:
- The dentist prepares the teeth of the patient and sends over the impression to the prosthetic laboratory.
- After the preparation of the mould, we digitalize the formations of the mouth by means of a laser scanner.
- We design the prosthesis for the graphically visualized mouth by means of software.
- Then we send it by e-mail to a milling centre abroad where it will be cut out from the requested material.
- After the finished skeleton arrived in the lab by express messenger, I construct the prosthesis by using ceramic plating in the tooth position, shape and colour typical to the mouth concerned.
- The dentist glues the finished work into the mouth of the patient.

Advantages:
- Microscopic closing at the edges
- Light transmission
- No metal
- High bending strength
- No cracking, bubble formation, or internal stress
- Metal allergy is excluded
- It is bio-compatible
- It does not burden the organism
- Industrial background - constant quality

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".

 

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