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Materialographic Examination of Three Different Types of Failed Dental Implants

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Published/Copyright: February 15, 2014
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Abstract

Focused on tissue interactions and the properties of the materials themselves, the causes of dental implant failure can be analysed successfully using methods developed within materials science. This will be exemplified by three failing implants. The implants represent a broad range of materials (titanium, PEEK, zirconium dioxide) and geometries (screw, cylindrical, disc).

Materials and methods: Following appropriate specimen collection and preparation, EDX, ESEM, light microscopy and ultrasound examinations were performed. Since only the titanium implant exhibited osseointegration, the implant-bone interface of this implant was additionally analysed by FIB-TEM.

Results: The absence of bone tissue residue on the zirconium dioxide and PEEK implants was confirmed by all imaging methods. Complete osseointegration is demonstrable only for a complete fragment of the titanium implant resected from the jaw bone, with a bone-to-metal contact of 82.5 %.

Conclusion: A bioactive interaction with the target tissues was found only for the titanium implant. The loss of the titanium implant examined was due to a material failure. High-frequency ultrasonic microscopy has proven a suitable tool for the assessment of osseointegration. A reduced sample preparation effort and an ability to use ultrasound in situ would suggest that ultrasonic microscopy technology is a suitable technology for failure analysis.

Kurzfassung

Die Ursachen des Versagens dentaler Implantate können im Hinblick auf Gewebeinteraktionen und die Eigenschaften der Materialien selbst anhand von in den Materialwissenschaften entwickelten Verfahren erfolgreich untersucht werden. Beispielhaft wird dies an drei versagenden Implantaten gezeigt. Die Implantate repräsentieren sowohl ein breites Spektrum an Materialien (Titan, PEEK, Zirconiumdioxid) als auch an Geometrien (Schraub-, Zylinder-, Diskimplantat).

Materialien und Verfahren: Nach entsprechender Probengewinnung und -präparation wurden EDX-, ESEM-, lichtmikroskopische und Ultraschalluntersuchungen durchgeführt. Da lediglich das Titanimplantat eine Osseointegration aufwies, wurde bei diesem Implantat die Grenzfläche Implantat/Knochen zusätzlich mittels FIB-TEM untersucht.

Ergebnisse: Die Abwesenheit von Knochengeweberesten auf den Zirconiumdioxid- und PEEK-Implantaten konnte mit allen bildgebenden Verfahren bestätigt werden. Lediglich beim Titanimplantat ist eine vollständige Osseointegration an einem aus dem Kieferknochen resezierten vollständigen Fragment mit einem Kontakt Knochen/Metall (Bone-Metall-Contact, BMC) von 82,5 % nachweisbar.

Schlussfolgerung: Eine bioaktive Interaktion mit den Zielgeweben ist nur beim Titanimplantat festzustellen. Der Verlust des hier untersuchten Titanimplantats ist auf Materialversagen zurückzuführen. Für die Beurteilung der Osseointegration hat sich die Hochfrequenzultraschallmikroskopie als geeignetes Instrument erwiesen. Der geringere Aufwand bei der Probenvorbereitung sowie die Möglichkeit, Ultraschall in situ einsetzen zu können, legt die Ultraschallmikroskopie als geeignete Technologie zur Schadensanalyse nahe.


Übersetzung: E. Engert


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Published Online: 2014-02-15
Published in Print: 2014-02-17

© 2014, Carl Hanser Verlag, München

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