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Dentricks have more than 30 years experience of this type of alloy .We are always
on the safe side when we do large MK bridges ...
90% of our production of metal ceramics
crown and bridges are made in Wirobond 280 alloy in the last year with excellent results.
Fore Implants
crown and bridges we also use Wirobond as I standard alloy
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Swedish
DENTRICKS har valt
WIROBOND dentallegering på grund av dess egenskaper
.Wirobond är biocompabilitetscertifigerad och allergitestad,fri från nickel och
beryllium samt CE-märkt.
Godkänd för fast
cementering!
WIROBOND kan ses som en ny standard för
metallkeramik och ett mycket ekonomiskt fördelaktigt alternativ för
patienterna.
Hållfasthet vid längre bro spann. Det faktum att
Wirobond är nästan
dubbelt så starkt som TITAN och GULD och har unika egenskaper när det gäller
bindning- metall till porslin. Vi har utfört flertal broar upp till 14 led och resultatet är mycket
bra. Lödning efter det att porslinet är pålagt anser vi som riskfyllt därför
har vi valt att inte utföra det inom ramen för vår kvalitetssäkring. Vi
gjuter pelare med prefabricerade para-post stift i Wirobond. Typ, parapost
-751-5 (XP) för dessa är kostnaden minimal .
Porslinet vi använder till
WIROBOND är DUCERAM plus...
Vi utför .
Implantat konstruktioner , Brånemark System®,
Cresco , Semados sys osv, med Wirobond som standard metall .
Kombinations protetik typ Öqvist, kronor samt
barer gjutna
i Wirobond med optimal kvalitet!
Även konus, RDS parallell frästa konstruktioner, Ets- broar och richmond
kronor med pinlegs pins utförda i Wirobond produceras hos oss .
Dentricks Tandteknik AB har arbetat med
WIROBOND sedan 1996.
Vi har över 30 år erfarenhet av att arbeta med denna typ av
metall.
Tandtekniker Richard Torell hos oss på Dentricks är certifierad technical adviser och expert på
Wirobond-C för det tyska företaget BEGO Bremer Goldschlägerei
Wilh.Herbst GmbH & Co.
Dentricks Tandteknik AB är utvalt av
BEGO company till test labb för nya
produkter .
Tandtekniker Richard Torells documenterade långa erfarenhet har bidragit till Dentricks sammarbete
med BEGO - Partners in Progress team .
Richard Torell har medverkat vid
Swedental under de senaste 8 åren och demonstrerat BEGO produkter
Richard Torell ingår i BEGO
Partners in Progress team sedan år 2002
Information from 
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Valuable information about BEGO non-precious alloys
Historical development
After several years of joint development work with Thyssen Stahl AG
Wiron® metal-ceramics was introduced world wide as a new technology in
1968. Metal-ceramics with the nickel-base alloy Wiron® very quickly
asserted itself on the international market. Not only the favourable
price, but also the outstanding material properties were decisive
factors for this rapid international success. An important factor here
was that besides developing a new alloy, emphasis was placed on offering
system with matching equipment and materials. Constant further
development led to the nickel-free variant Wirobond®, Wiron® NT,
Wiron® 99, Wiron® 88 and the cobalt-chrome metal-to-ceramic
alloy Wirobond® C represent the current state of the art.
Clinical proof
The entire Wirobond® and Wiron® product group is not only clinically
tested, but also clinically proven. This fine difference means security
for dentists, dental technicians and in particular for patients. The
prosthetic reliability, clinical suitability and corrosion resistance of
these products have been investigated for many years and confirmed as
good. Over 250 scientific studies both in Germany and abroad are listed
in BEGO's bibliography of literature concerning non-precious alloys. We
will gladly send you a copy on request.
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"Historical" bridge of Wiron®
from 1968
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BEGO cobalt-chrome alloys:
The nickel-free alternative
Wirobond® C
Wiron® and Wirobond® C have very similar properties and processing
characteristics. Wirobond® C is a cobalt-chrome alloy and is produced
without nickel. Its composition resembles that of the partial denture
alloys which have been tried and tested for decades.
Cobalt-chrome base alloys have dominated the trend in non-precious
metal-to-ceramic alloys for several years now. This is why Wirobond® C
is not only a good alternative whenever a cobalt-chrome alloy must be
used because of the material properties similar to those of partial
denture alloys or because of another dental indication.
In comparison to the Wiron® alloy product group, processing is
extensively identical and the material properties are similar, with the
exception of the slightly greater hardness. Otherwise Wirobond® C
is melted and processed like Wiron®. The connection to the ceramic
materials is secure and proven (see: Processing of ceramic materials).
Wirobond® C can naturally also be veneered with acrylic as in the
case of Wiron®. The expertise on the biocompatibility tests conducted
by Dr. Henning& Co. Dental Engineering in Basel states, among other
things:
"Wirobond® C has no cytotoxic potential and causes no skin
irritations and no allergic sensitisation."
We will gladly send you a copy of the respective certificates for
Wirobond® C, Wiron® NT and Wiron® 99 on request.
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BEGO non-precious alloys: Corrosion-resistant and biocompatible
Corrosion resistance
The composition and purity of the constituent elements are requirements
for corrosion-resistant and biocompatible alloys.
Wirobond® C, Wiron® NT and Wiron® 99 form an extremely dense and
firmly adhering passive layer that is extremely resistant, as confirmed
by numerous tests on the loss of mass in non-precious alloys.
To quote from the original paper by J.Geis-Gerstorfer, H. Weber and
K.-H. Sauer:
"If one compares the nickel concentrations absorbed through food
and medicine intake to the nickel discharged from crowns, this discharge
appears to be negligible, provided alloys classified as good in this
respect are used."
Biocompatibility
The biocompatibility, i.e. the compatibility of a material with respect
to natural tissue, is extraordinarily good.
BEGO non-precious alloys have been scientifically observed and tested
more extensively than virtually any other group of alloys. Their
reliability has been confirmed time and again.
Even after 5-year storage in a corrosion solution, sharp grinding
grooves can still be seen in the image of Wiron® 99 taken with a
scanning electron microscope.
This means that minimal corrosion has taken place and that Wiron® 99
displays outstanding passivation properties.
In contrast to Wiron® 99, a NiCr alloy with only 13% chromium
shows a completely destroyed surface. This observation also correlates
with the very high ion discharge of this alloy. Therefore, this type
of alloy should not be used.
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View of surface of Wiron® NT
through scanning electron microscope
Wiron® 99
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Metallurgical aspects of BEGO non-precious alloys
Modulus of elasticity
It is crucial for the load bearing capacity of a crown and bridge
structure and the bond between the ceramics and the metal frame. The
modulus of elasticity for non-precious alloys is nearly double as high
as that for precious-metal-to-ceramic alloys.
This means double the security with regard to deformations due to
masticatory forces with the same wax-up.
The higher the modulus of elasticity, the greater the force necessary
for elastic deformation. The material is rigid and dimensionally table.
Bonding strength
The bond between Wirobond® C or Wiron® 99 and ceramic material is very
good. However, this is not the result of chance, but of the close
cooperation with the leading manufacturers of ceramic materials.
These materials and the properties of BEGO non-precious alloys are
matched to one another such that the metal-to-ceramic bond stands up to
any comparison, no matter how critical.
The coefficient of thermal expansion is important for the bond between
metal and ceramics. It indicates the expansion of a material at a heat
rise of 1 °K.
The values for the coefficient of thermal expansion between metal and
ceramics must be matched through the firing procedure.
Heat resistance
Both in connection with soldering and in veneering ceramics, Wirobond® C
and Wiron® 99 ensure great reliability in the avoidance of
deformation since the modulus of elasticity of Wirobond® C and
Wiron® 99 is considerably higher at a veneering temperature of 960
°C (1760 °F) than in the case of a metal-to-ceramic alloy with a high
gold content. As a consequence, dentists can rely on accurate fit of the
frame after veneering. The mechanical properties of Wirobond® C
and Wiron® 99 are guarantees for dimensional stability during
ceramic firing.
Thermal conductivity
It is extremely low and protects the pulpa of the bridge abutment teeth
against severe temperature stimuli, such as those that may occur with
precious metal alloys.
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Wiron® 99
approx.. 215.000 MPa
BegoPal® 300
approx. 135.000 MPa
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Alloy properties
Wirobond® C, Wiron® NT, Wiron® 99 and Wiron® 88:
Non-precious alloys for veneering with ceramics or acrylic
| Standard values: |
Wirobond® C |
Wiron® NT |
Wiron® 99 |
Wiron® 88 |
| Colour |
silver |
silver |
silver |
silver |
| Density |
8.5 g/cm³ |
8.2 g/cm³ |
8.2 g/cm³ |
8.2 g/cm³ |
| Melting interval |
1380-1270 °C |
1350-1260 °C |
1310-1250 °C |
1310-1250 °C |
| Casting temperature |
1470 °C |
1450 °C |
1420 °C |
1420 °C |
| Coefficient of expansion |
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| 25 - 600 °C |
14,2 x 10-6 |
14,0 x 10-6 |
14,0 x 10-6 |
14,1 x 10-6 |
| 25 - 500 °C |
14,0 x 10-6 |
13,8 x 10-6 |
13,8 x 10-6 |
13,9 x 10-6 |
| Ductile yield (Rp 0,2) |
390 MPa |
370 MPa |
330 MPa |
360 MPa |
| Elongation limit (A5) |
6% |
30% |
25% |
15% |
| Modulus of elasticity |
ca. 210.000 MPa |
ca. 200.000 MPa |
ca. 205.000 MPa |
ca. 200.000 MPa |
| Vickers hardness (HV10) |
310 |
195 |
180 |
200 |
| Composition %: |
Wirobond® C |
Wiron® NT |
Wiron® 99 |
Wiron® 88 |
| Nickel |
Ni |
- |
61,4 |
65 |
64 |
| cobalt |
Co |
61 |
- |
- |
- |
| Chromium |
Cr |
26 |
22,9 |
22,5 |
24 |
| Molybdenum |
Mo |
6 |
8,8 |
9,5 |
10 |
| Tungsten |
W |
5 |
- |
- |
- |
| Silicium |
Si |
1 |
- |
1 |
1,5 |
| Niobium |
Ni |
- |
3,9 |
1 |
- |
| Iron |
Fe |
0,5 |
2,5 |
0,5 |
- |
| Manganese |
Mn |
- |
0,4 |
- |
- |
| Titanium |
Ti |
- |
0,1 |
- |
- |
| Cerium |
Ce |
0,5 |
- |
0,5 |
0,5 |
| Carbon |
C |
max. 0,02 |
- |
max. 0,02 |
0,02 |
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LINK
to Bremen in Germany .
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