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Introduction
GC Europe - corporation is one of the leading producers and distributors of the
material for stomatologists and dental technicians. Having a world team of 1500
associates, GC Corporation sets guidelines and develops new approaches in more
than 100 countries of the world. Its motivating force is above all “quality at
the first place”.
A lecturer and the promoter of the company GC, dr Hien Ngo has a wide range of
scientific references. Moreover, he is a head-manager of a big researching
center CACD of the University in Adelaide (Australia), a member of six
international, professional organizations, a winner of two international prizes
for rese-arching work and a participant in the international projects. He has
been giving lectures around the world (Sidney, Paris, Melbourne, Victoria,
Mains, Tokyo, Brisbane, Adelaide, and Philadelphia, Singapore…) since 1994.
The prevailing tendency of his research is an interaction between glassionomer
and dental tissue and the application of various micro-scopic and micro
analytical techniques in tooth decay (dental caries), as well as development and
application of “minimal intervention” concepts in clinical praxis.
The whole day program of the lecture has three thematic parts:
1. Past, Present and Future: a survey of the development of contemporary
clinical stomatology;
2. Mechanical merging and chemical conne-ction: when, where and how;
3. The latest innovations in glassionomers and its clinical application.
As a part of the first subject, starting from the essence of the tooth decay
disease, a lecturer elaborated on the development of the therapy- restorative
clinical stomatology, from the basic principles of Black's doctrine up to the
present age, in accordance with the progress of technical possibilities and the
development of new materials and scientific thought. In the concluding analysis,
he mentioned, as a possibility of choice, a range of five types of material for
tooth restorative: Amalgam, Conventional glassionomer, Compomers.
Judging pros and cons of certain restorative materials, or having in mind many
other things such as the duration of clinical treatment results, profitability,
patients' satisfaction, est., the lecturer tried to suggest a practical approach
to choosing the best one for the given indication, and in the given
circumstances.
In the following thematic parts (2 and 3), the lecturer gave account of the
latest innovations in glassionomers and of their clinical application. The
materials in question are by all means leading in all the parts of
stomatological science and praxis.
As far as restaurative-therapic and preventive clinical applications are
concerned, the lecturer singled out four improved versions of con-ventional
glassionomer emphasizing the advantages of each separately: GC Fuji IX GP and GC
Fuji IX GP FAST, as well as the latest GC Fuji VII.
GC Fuji II glassionomer presents the base of this group of restorative
materials. This is a self--hardening conventional glassionomer. It ren-ders good
and certain esthetic restoratives for cavities belonging to either III or IV
class, in the front teeth of adults, and deciduous teeth of children. The
producer recommends it for the therapy of tooth decay on the surface of the root
and cervical erosions, and for the foundation under the amalgamic and composite
filling. The simplicity of GC Fuji II application is emphasized. Apart from
that, its solid chemical adhesion for dentin and enamel is emphasized. It isn't
susceptible to moist, so the need for dry working area is lacking. Likewise,
micro-retention is not necessary as well as a means for connection (adhesive).
Solid adhesion of material renders good, permanent cusp leaning, which prevents
micro crevasses and at the same time bacterial inoculation and discoloration as
well. It is especially significant that it is biocompatible and that it gives
away a lot of flouride, which makes it more and more resistant to being damaged.
GC Fuji II LC Improved is a glassionomer intensified by acrylate. It presents an
improved version of GC Fuji II LC, the first light-polymerized glassionomer.
Thus, GC Fuji II LC Improved combines the advantages of its precursor with the
additional advantages of composite technology.
GC Fuji II LC Improved is characterized by a certain aesthetic, easy use, and
the improved mechanical features. When all the above mentioned is taken into
consideration, it seems to be an excellent solution for restoratives of classes
III and IV of the front and back teeth in adults and children respectively. It
is recommended, too, as a cover or foundation under the amalgam and composite
filling, that is, composite or chemical in-lays.
The producer further emphasizes as the advantages of this glassionomer the
following: good aesthetic results thanks to the wide range of color shades,
solid chemical adhesion, resistance to moisture, light-polymerization with
controlled time of hardening, excellent cusp leaning, improved mechanical
features caused by combination of acrylate with glasionomer, which manifests as
resistant to wearing out, high giving away of fluids, biocompatibility, and good
visibility.
Due to the cited features and their advantages, the producer was of the opinion
that GC Fuji II Improved was a very popular choice, including an inaccessible
area of tooth where cofferdam was difficult to place and where cavities became
larger affecting dentin as well, or where enamel couldn't be damaged.
GC Fuji IX GP presents one of the leading glassionomeric materials for
restoratives in the world. It is used in more than 120 countries of the world.
It is a conventional, self-hardening glassionomer, done in a compact non sticky
form, which can easily be placed inside the cavity, and can easily be shaped due
to its metal matrixes. All cited features of GC Fuji IX GP, plus its high
resistance to being damaged and some other advantages of glasionomer, make it an
ideal for classes I, II and V of back teeth filling in adults and children
respectively, as well as for superstructure. It can be used for “sandwich”
technique with composite material or in-lay.
GC Fuji GP Fast has all good qualities of GC Fuji IX GP, but it is even more
solid, resistant, and it hardens two times faster, witch is particularly useful
in situations where speed is important.
GC Fuji VII is the latest from the whole range of glassionomeric restoratives of
this firm, and the producer hasn't included it yet in the catalogue. Mr Hien, a
promoter, spoke about it in a rather flattering manner which aroused great
interest among the people. It is an already used glassionomeric filling with the
additionally enriched ionic potential. Namely, this material gives away ions of
some other microelements, out of which, the most important are strontium and
calcium. As it is well-known that these microelements actively take part in
mineralization of teeth, that is, in the processes of remineralization and
demineralization of caries lesion, the producer is of the opinion that there is
a basic possibility of changing the approach in the treatment of caries. In
addition, there is a possibility of placing demineralizing dentin in the wider
parts of tooth cavity, under the ironically enriched glassionomeric restorative.
As a consequence, a mutual continuous passage of ions from glassionomer to
demineralizing dentine and vice versa (in the opposite direction; as a part of
the interaction between glassio-nomers and dental tissue) would brought about
the remineralization of the softened tissue (as the most important application)
while it would create a very resistant zone which is practically resistant for
bacteria.
This changed approach in the treatment of caries and restorative stomatology has
been introduced into the concept of “minimal intervention” in clinical praxis by
dr Hien Ngo, a promoter of the firm GC.
With all due respect of the firm GC Fuji and its promoter Dr Hien Ngoa, it is
obvious that all the above suggested needs a lot of critical verifications and
checking during the period of many years to follow. The least that could be
offered to the practitioners is to be rather careful. The author of this paper
still keeps in memory the promotion of "perfect and universal" dentin adhesits
of the firm "Vivadent - Lihtenstaine", which was, less pompously, announced in
the same auditorium of Center Sava during the World Congress of Stomatology in
1985 by the famous professor Belvedere. On that occasion, a great importance was
ascribed to this means and at the same time, convincing results were presented.
The least that could be noticed here is a concluding remark that the promotion
of the corporation GT Fuji carried out by the famous Dr Hien Ngoa, was very
significant and convi-ncing in the informative sense.
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