Zusammenfassung
Das Friktionsverhalten von Bracket-Bogen-Kombinationen ist sehr komplex und wird von
vielen Details beeinflusst. In dieser Studie wurde der Einfluss von Vibrationen auf
das Friktionsverhalten von Bracket-Bogen-Systemen untersucht. Hierzu wurden marktübliche
Brackets vermessen und nach ihrer Friktion an einem Stahlbogen eingeteilt. Dabei stellte
sich heraus, dass sich sowohl die Breite als auch das Material der Brackets auf die
Friktion auswirkt. Die Schwingungen einer elektrischen Zahnbürste reduzierten die
Friktion um 5 bis 70 %. Die erzielte Reduktion hing von der Leistungsfähigkeit der
Bürste ab. Da Vibrationen durch Zahnbürsten am Menschen täglich vorkommen, sollte
sich die an einem In-vitro-Messplatz gefundene Reduktion der Friktion auf In-vivo-Bedingungen
übertragen lassen. Durch die Eigenbeweglichkeit der Zähne und Vibrationen aus dem
täglichen Leben ergeben sich deutlich geringere Friktionswerte im Munde als bisher
angenommen. Die bisher in In-vitro-Studien festgestellten Reibungswerte stellen demnach
den ungünstigsten Fall dar, da sie diese klinischen Bedingungen nicht berücksichtigen.
Abstract
The frictional behaviour of bracket-archwire combinations is very complex and influenced
by many details. The influence of vibrations on the frictional behaviour of bracket-archwire
systems was investigated in this study. For this, commercially available brackets
were measured and classified according to their friction on a steel archwire. In doing
so, it became apparent that the bracket width as well as its material has an effect
on the friction. The oscillations of an electric toothbrush reduced the friction by
5 to 70 %. The achieved reduction depends upon the capacity of the toothbrush. As
vibrations caused by toothbrushes occur in humans everyday, it should be possible
to transfer the reduction of friction found in an in vitro measuring station to in
vivo conditions. In the mouth considerably lower friction values than assumed until
now result from the tooth mobility and the vibrations from daily life. Thus, the friction
values of in vitro studies detected until now show the worst case as they do not consider
these clinical conditions.
Schlüsselwörter
Friktion - Slot - Bracket - Bogen - elektrische Zahnbürste
Key words
friction - slot - bracket - archwire - electric toothbrush
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Dr. C. Sander
Universitätsklinikum Ulm · Abteilung für Kieferorthopädie
Oberer Eselsberg
89081 Ulm
Phone: 07 31/50 02 37 30
Fax: 07 31/50 02 37 39
Email: guenter.sander@uni-ulm.de
