title: Fitting of an 8.5-millimeter abutment for bone conduction devices: indications and postintervention course.
abstract: OBJECTIVE
  We present indications and clinical outcomes of fitting an 8.5-mm abutment for bone conduction devices.
  
  
  METHODS
  In 39 cases with a follow-up time of more than 12 months after fitting of an 8.5-mm abutment, the preintervention and postintervention courses were retrospectively evaluated. The outcome measures were indications for fitting and complications during the preintervention and postintervention courses (local skin reaction, skin level, revision surgery, and implant loss).
  
  
  RESULTS
  Soft tissue overgrowth was the most frequent reason (31 of 39 cases) for fitting the 8.5-mm abutment. Severe skin reactions decreased by 7.9% after fitting, and the number of fixtures that remained free of any skin reaction increased by 32.2%. In 7 cases, soft tissue overgrowth required revision surgery before placement of the 8.5-mm abutment; further surgical intervention was needed only once. In 1 case, the 8.5-mm abutment was removed because of recurring soft tissue problems. No spontaneous abutment or implant loss occurred.
  
  
  CONCLUSIONS
  This retrospective evaluation showed that fitting an 8.5-mm abutment is an easy step in managing soft tissue problems and preventing revision surgery. Also, it is of value in patients with a thick scalp that interferes with bone conduction device coupling. In these cases, we advise placing the 8.5-mm abutment during primary surgery.
authors.affiliation: Department of Otorhinolaryngology, Institute of Clinical Neuroscience, Donders Center for Cognition, Brain and Behavior, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands.
authors.forename: Catharina A J
authors.initials: CA
authors.lastname: Dun
authors.forename: Myrthe K S
authors.initials: MK
authors.lastname: Hol
authors.forename: Emmanuel A M
authors.initials: EA
authors.lastname: Mylanus
authors.forename: Cor W R J
authors.initials: CW
authors.lastname: Cremers
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001844:Bone Conduction; D002648:Child; D002675:Child, Preschool; D012048:Correction of Hearing Impairment / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006314:Hearing Loss, Conductive / Q000534:rehabilitation* / Q000601:surgery; D006801:Humans; D008280:Magnetics; D008297:Male; D008875:Middle Aged; D016348:Osseointegration; D011182:Postoperative Care / Q000379:methods*; D011474:Prosthesis Design; D017755:Prosthesis Fitting; D012189:Retrospective Studies; D016896:Treatment Outcome; D055815:Young Adult