title: [Aluminum oxide ceramic PORP and TORP prostheses].
abstract: The tolerance of bio-inert aluminium oxide ceramic as a PORP or TORP design has been studied histologically and clinically. Thirty-five patients had an aluminium oxide prosthesis implanted into the middle ear. There was a hearing gain of 21 dB in the speech frequencies. Patients were monitored for an average period of 20 months (3/4-2 1/4 years); the shortest period was 9 months, the longest 27. The functional results were satisfactory. The acoustic efficiency between 0-20 dB air-bone gap was not greater than with human ossicles or cartilage, although there was no fixation or resorption and a better structural stability.
mesh_terms: D000535:Aluminum; D000537:Aluminum Oxide; D001672:Biocompatible Materials; D002516:Ceramics; D004432:Ear, Middle / Q000033:anatomy & histology; D004848:Epithelium / Q000033:anatomy & histology; D006801:Humans; D019736:Prostheses and Implants; D011474:Prosthesis Design; D013201:Stapes Surgery / Q000379:methods*
chemical_list: D001672:Biocompatible Materials; D000535:Aluminum; D000537:Aluminum Oxide
vernacular_title: Keramische PORP en TORP prothesen van aluminiumoxyde.