implantaten und Aufbau - BEGO

10 Originalia – Materials Science
Voltage [mV]
300
200
100
0
–100
Implant against CoCr in NaCl
Sample 1
Sample 2
Sample 3
Sample 4
Current [nA]
for the CoCr alloy at acidic pH values, the corrosion
currents doubled for titanium superstructures
and tripled for the precious-metal alloy.
The results of this investigation indicate that
prefabricated CoCr superstructures can be used
on implants at least as safely as titanium or
high-gold precious-metal alloys.
Acknowledgement
We wish to thank Bego Implant Systems in Bremen
for supplying the implants and the prefabricated
implant superstructures.
Fig. 5 Result of measurements on four implant/CoCr
alloy pairs in normal saline solution.
The short-circuit currents were extrapolated for
decreasing voltages with increasing currents
against a voltage of 0 V. The free surface area of
the superstructure was 2.2 cm 2 .
med that all the corrosion currents would be
smaller on smooth surfaces [1]. It therefore follows
that the form of surface treatment selected
by us simulated a particularly unfavourable
situation and the current densities to be expected
in the clinical situation are smaller.
Clinical relevance
When using implants, it must be remembered
that CoCr superstructures in combination with
titanium implants display smaller corrosion
currents than is the case with superstructures
made of titanium or a high-gold alloy. Whereas
no increase in the corrosion current was found
Literatur
1 Borchers. Metallkunde II, Berlin: Walter de
Gryter&Co. 1969
2 Heitz et al. Korrosionskunde im Experiment. Weinheim:
VCH, 1990
3 Hesse (Hrsg). Giesserei Lexikon. Fachverlag Schiele
& Schoen, 2000
4 Kulmburg et al. Untersuchung der Korrosionsbeständigkeit
von Rein-Titan. Stomatologie 2006;
103: 71–76
5 Kulmburg et al. Die Korrosion von Nichtedelmetall
(NE)-Legierungen. ZWR 1986; 95: 544–550
6 Taher, Al Jabab. Galvanic corrosion behaviour of
implant suprastructure dental alloys. Dental Mat
2003; 19: 54–59
7 Venugopalan et al. Evaluation of restaurative and
implant alloys ganvanically coupled to titatnium.
Dent Mat 1998; 14; 165–172
Peer-reviewed paper
Address for correspondence
Prof. Michael Gente
Abt. für Zahnersatzkunde, Bereich für Propädeutik
und Kiefer-Gesichts-Prothetik
Medizinisches Zentrum für ZMK-Heilkunde
Georg-Voigt-Str. 3, 35033 Marburg/Lahn, Germany
E-mail: michael@gente.de
Impressum
Schriftleitung und Redaktion
Dr. med. dent. Cornelia Gins
Platanenallee 39, 14050 Berlin
Tel.: 030/3041600, Fax 030/3054574
E-Mail: Dr.C.Gins@t-online.de
Herstellung/Layout: Wolfgang Eckl
Verlag: Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart
ZWR ̶ Das Deutsche Zahnärzteblatt 2008; 117 (10)