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Survival of the 8.5 mm osseointegrated abutment, and its utility in the obese patient

Published online by Cambridge University Press:  30 May 2013

M D Darley  and
A A Mikulec
M D Darley
Affiliation:
Department of Otolaryngology – Head and Neck Surgery, Saint Louis University School of Medicine, Missouri, USA
A A Mikulec*
Affiliation:
Department of Otolaryngology – Head and Neck Surgery, Saint Louis University School of Medicine, Missouri, USA
*
Address for correspondence: Dr A A Mikulec, Department of Otolaryngology – Head and Neck Surgery, Saint Louis University School of Medicine, 6th Floor FDT, 3635 Vista Ave, St. Louis, Missouri 63110, USA E-mail: mikuleca@slu.edu
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Abstract

Background:

Most of the literature regarding osseointegrated implantation for hearing rehabilitation focuses on the 5.5 mm abutment. This study aimed to add to the data available on the survival of the 8.5 mm abutment, and to describe its utility in obese patients.

Objective:

To review the outcomes of patients who received a bone-anchored hearing aid implant, and create a model comparing the mechanical forces acting upon combinations of fixture and abutment lengths.

Methods:

Retrospective chart review and mathematical modelling.

Results:

In this retrospective cohort study comprising 25 patients, less abutment overgrowth was observed in the 8.5 mm abutment recipients versus recipients of the 5.5 mm abutment. When the principle of equilibrium of a rigid body was applied, the 8.5 mm abutment was at a calculated mechanical disadvantage compared with the 5.5 mm abutment.

Conclusion:

The 8.5 mm abutment may be useful in patients with copious subcutaneous soft tissue as in the obese population. The 8.5 mm abutment has a calculated mechanical disadvantage, potentially putting the implant under greater mechanical stress; however, the clinical relevance of this is unclear.

Keywords

Hearing AidsHearing Loss, UnilateralRehabilitation of Hearing ImpairmentOsseointegrationAdverse EffectsProsthesis ImplantationInstrumentationObesity
Type
Main Articles
Information
The Journal of Laryngology & Otology , Volume 127 , Issue 7 , July 2013 , pp. 643 - 649
Copyright
Copyright © JLO (1984) Limited 2013 

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