gms | German Medical Science

79. Jahresversammlung der Deutschen Gesellschaft für Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie e. V.

Deutsche Gesellschaft für Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie e. V.

30.04. - 04.05.2008, Bonn

Laser doppler vibrometry of bone anchors in a temporal bone model

Meeting Abstract

German Society of Oto-Rhino-Laryngology, Head and Neck Surgery. 79th Annual Meeting of the German Society of Oto-Rhino-Laryngology, Head and Neck Surgery. Bonn, 30.04.-04.05.2008. Düsseldorf, Köln: German Medical Science; 2008. Doc08hno49

Die elektronische Version dieses Artikels ist vollständig und ist verfügbar unter: http://www.egms.de/de/meetings/hno2008/08hno49.shtml

Veröffentlicht: 8. Juli 2008

© 2008 Goldberg et al.
Dieser Artikel ist ein Open Access-Artikel und steht unter den Creative Commons Lizenzbedingungen (http://creativecommons.org/licenses/by-nc-nd/3.0/deed.de). Er darf vervielf&aauml;ltigt, verbreitet und &oauml;ffentlich zug&aauml;nglich gemacht werden, vorausgesetzt dass Autor und Quelle genannt werden.


Gliederung

Text

Bone anchored hearing aids (BAHA) are established for the rehabilitation of patients with conductive or mixed hearing loss and single sided deafness. However, a more frequent implant loss is observed in children compared to adults. It might be that the constant vibration of the bone anchor modulates the osseointegration in juvenile bone differently than in mature adult bone.

In this study we investigated if there is relative movement of a primary fixed bone anchor towards the temporal bone. For this purpose a bone anchor was implanted in a human fresh frozen temporal bone in the standard procedure. A thin layer of bone was removed along the implant axis to scan the screw movements with a laser doppler vibrometer (LDV). The anchor was loaded with three different types of BAHA devices (Compact, Classic, Cordelle II) and a stimulus sweep between 500 and 4000 Hz was applied. LDV measurements were taken from six points at the screw and from according points at the bone. The recorded data was filtered using fast Fourier transformation and the results were statistically analysed using standard data spread sheets and statistic software.

The results indicate that there is a relative movement of a primary fixed bone anchor in its surrounding bone. This movement is independent from the used device. The difference in vibration between screw and bone is similar for all measured points along the implant. The resonance frequencies were recorded at 2400 and 3800 Hz.

Especially in children the different vibration behaviour could lead to an activation of bone remodelling and thus cause the increased loss of implants. An early load of the implant should therefore not be performed and it is essential to wait for a full osseointegration.