title: Measurement of implant stability and auditory pure-tone thresholds of Baha patients comparing osteosysthesis and osseointegrated systems.
abstract: With bone-anchored hearing systems the implant-bone junction is critical for the transmission of mechanical vibrations to the skull. The implant stability might differ between available and widely applied implants and can be estimated by resonance frequency analysis. The implant stability and the audiological performance of ten adult long-time users where a bone-anchored hearing system was connected by an Baha osseointegrated implant (Cochlear Ltd, Mölnlycke, Sweden) were compared with the implant stability of fourteen adult patients provided with a Ti-epiplating osteosysthesis system (Medicon, Tuttlingen, Germany). The acute implant stability was compared between these two implants with one cadaveric skull. The results show higher resonance frequencies and thus higher implant stability for the osseointegrating system of both, measuring acute and after long-time use of the implants. The audiological outcomes show frequency dependent differences between both systems as determined by comparing pure-tone bone-conduction audiometry. However, measuring thresholds by a direct stimulation of the implant reveals better hearing with low frequencies for the osseointegrated system and for high frequencies with the osteosysthesis system. At all, the implant selection has an impact on the implant stability and on the pure-tone hearing.
authors: University Hospital Halle (Saale), Department of Otorhinolaryngology, Hearing and Implant Center, Halle (Saale), Germany. Electronic address: torsten.rahne@uk-halle.de.
authors: Torsten
authors: T
authors: Rahne
authors: University Hospital Halle (Saale), Department of Otorhinolaryngology, Hearing and Implant Center, Halle (Saale), Germany.
authors: Gerrit
authors: G
authors: Götze
authors: University Hospital Halle (Saale), Department of Otorhinolaryngology, Hearing and Implant Center, Halle (Saale), Germany.
authors: M Katharina
authors: MK
authors: Pein
mesh_terms: D000328:Adult; D001309:Auditory Threshold; D001844:Bone Conduction; D001863:Bone Screws; D002102:Cadaver; D019544:Equipment Failure Analysis; D005260:Female; D006310:Hearing Aids; D034381:Hearing Loss / Q000175:diagnosis / Q000503:physiopathology* / Q000534:rehabilitation*; D006801:Humans; D008297:Male; D016348:Osseointegration; D009998:Ossicular Prosthesis; D010898:Pitch Perception; D011474:Prosthesis Design; D017755:Prosthesis Fitting / Q000295:instrumentation / Q000379:methods; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D016896:Treatment Outcome; D055815:Young Adult
keywords: Bone-anchored hearing systems (BAHS); Bone-conduction direct (BCD); Hearing threshold; Hörschwelle; Implant stability quotient (ISQ); Implantatstabilität; Knochenverankerte Hörsysteme; Osseointegration; Resonance frequency; Resonanzfrequenz