title: Torps and porps: a transmission and scanning electron microscopic study.
abstract: TEM and SEM were used to evaluate the fate of eleven Plasti-pore prostheses left in the human middle ear for periods varying from seven to 34 months. It was evident that Plasti-pore is a relatively inert material based on its clinical performance, absence of gross fibrous tissue reaction from the middle ear, and the unchanged physical characteristics of the prosthesis. Micro-disintegration of the TORPs and PORPs was suggested by the consistent foreign body reaction invading their structure, and the presence of particulate-like matter inside the giant cells. However, micro-disintegration did not affect the physical characteristics of the prosthesis and seem to have little bearing on their clinical performance. The question of the long-term performance of Plasti-pore remains to be answered.
mesh_terms: D000328:Adult; D002648:Child; D003054:Cochlear Implants; D003094:Collagen; D004432:Ear, Middle; D005260:Female; D005549:Foreign-Body Reaction / Q000473:pathology; D006801:Humans; D008264:Macrophages / Q000648:ultrastructure; D008297:Male; D008855:Microscopy, Electron, Scanning; D008875:Middle Aged; D011183:Postoperative Complications
chemical_list: D003094:Collagen