Osseointegrated titanium implants in the temporal bone. A clinical study on bone-anchored hearing aids

Area of Science:

• Otolaryngology
• Biomaterials Engineering
• Surgical Innovation

Background:

• Hearing impairment affects millions globally, with limited effective treatment options for certain types.
• Traditional hearing aids can be cumbersome and may not address all forms of hearing loss.
• Direct bone conduction offers a promising alternative by bypassing external soft tissue obstruction.

Purpose of the Study:

• To evaluate the feasibility and efficacy of a novel direct bone conduction hearing aid system.
• To assess the osseointegration of titanium implants in the temporal bone for hearing aid attachment.
• To determine the impact of the new system on hearing thresholds and soft tissue response.

Main Methods:

• A gentle surgical technique was employed to insert titanium screws into the temporal bone of 14 patients.
• Implants were assessed for osseointegration over a 2-4 year follow-up period.
• Bone-anchored titanium screws were connected to skin-penetrating abutments for hearing aid attachment.

Main Results:

• Titanium implants demonstrated successful osseointegration in the temporal bone, similar to long bone integration.
• The direct bone conduction system provided a hearing improvement of approximately 15 dB in pure-tone threshold.
• Permanent skin penetration through abutments resulted in no adverse soft tissue effects.

Conclusions:

• Titanium implants are suitable for osseointegration in the temporal bone for direct bone conduction hearing aids.
• The developed system offers a viable solution for hearing loss with significant audiological benefits.
• Future research will focus on optimizing hearing aid design for directly bone-anchored applications.