Scanning Electron Microscopic Study on Surface and Component of Extuded Polycel TORPs and PORPs / 대한이비인후과학회지

BACKGROUND AND OBJECTIVE: During the last decade, the surgical use of alloplasts has become more and more widespread among otologists. But extrusion has been the general problem associated in using alloplasts. This study analyzes the change of' surface and microcomponent of the extruded Polycel prosthesis following a long-term middle ear implantation. MATERIALS AND METHODS: Nine extruded Polycel prosthesis were investigated using scanning electronmicroscopy (SEM) and energy dispersive spectrometer (EDS). RESULTS: They all showed a severe resorption of fibrous encapsulation and partial resorption of the shaft which faced stapes and footplate. The carbon component decreased and nitrogen and oxide increased more than the original Polycel due to microdegradation. CONCLUSION: Consistent microdegradation and resorption may be one of the factors causing extrusion of Polycel.

A Clinical Study of the Ossiculoplasty in the Chronic Otitis Media / 대한이비인후과학회지

Reconstruction of the middle ear conduction mechanism continues to pose a significant challenge to the otolaryngologist. To investigate the suitable material and surgical method to get optimal hearing gain in the middle ear surgery, two hundred and twenty-two cases of different kind of ossiculoplasty in patients suffering from chronic middle ear disease at the Severance hospital and Soh's ENT clinic from January 1989 to December 1994 were included in this retrospective study and we reviewed the previous reports about the ossiculoplasty at the department of otolaryngology, Yonsei University College of Medicine from January 1981 to December 1988. A successful hearing gain was defined as a post-operative air-bone gap of

A Clinical Study of the Ossiculoplasty in the Chronic Otitis Media with Cholesteatoma / 대한이비인후과학회지

The purpose of this study is to investigate the middle ear condition, surgical method and suitable material for optimal hearing gain in the middle ear cholesteatoma surgery. One thousand and thirty six cases of ossiculoplasty in patients suffering from chronic otitis media with cholesteatoma at the university hospitals in Korea from November 1984 to July 1996 were included in this retrospective study. Sixty two per cent of cases were successful according to the success criterion of a post-operative air-bone gap of >or= 30dB, 33.4 percent according to >or= 20dB, and 12.6 percent according to >or= 10dB. Good prognostic factors in the middle ear condition were healthy middle ear mucosa, patent eustachian tube orifice, and presence of superstructure of stapes. Two staged ossiculoplasty showed better result than one staged ossiculoplasty. There was no statistical difference of the hearing improvement between the open cavity mastoidectomy and the intact canal wall mastoidectomy techniques. Favorable materials for ossicular reconstruction were in decending order, polycel, ossicle, cartilage, and hydroxylapatite.