Tympanic membrane perforation may be traumatic in origin or due to CSOM which may not heal spontaneously. Over the years various modalities of treatment have evolved for the treatment of this. Primary aim of the treatment is to control and eliminate the foci of infection. The closure of tympanic membrane perforation with different graft materials restores the vibratory area of the membrane, gives round window protection, reduces susceptibility of the middle ear mucosa to infection and improves hearing. Two basic techniques have come up in which the graft is placed either over the drum remnant or under the drum remnant and the techniques are called overlay and underlay respectively. The present study is an attempt to compare the results of both techniques in a tertiary care hospital. Tympanic membrane perforation may be traumatic in origin or due to CSOM which may not heal spontaneously. Over the years various modalities of treatment have evolved for the treatment of this. Primary aim of the treatment is to control and eliminate the foci of infection. The closure of tympanic membrane perforation with different graft materials restores the vibratory area of the membrane, gives round window protection, reduces susceptibility of the middle ear mucosa to infection and improves hearing. Two basic techniques have come up in which the graft is placed either over the drum remnant or under the drum remnant and the techniques are called overlay and underlay respectively. The present study is an attempt to compare the results of both techniques in a tertiary care hospital.
KEYWORDS: Underlay technique, Overlay technique, Myringoplasty.
MATERIALS AND METHOD:The present study to compare the overlay and underlay -techniques of myringoplasty was carried out in the Department of Otorhinolaryngology, MOSC Medical College Kolenchery during April 2011and March2012. All patients withtubotympanic type of C.S.O.M who fulfill the inclusion criteria and are willing for the surgery are included in the study.30 patients with dry central perforation, hearing loss of 10 to 45 dB and good cochlear reserve were included in the study. They are divided into 2 groups by random selection; one undergoing overlay technique and the other underlay technique of myringoplasty. Those withpars flaccida perforation, marginal perforation, wet ears and poor cochlear reserve were excluded. The pars tensa perforation was classified according to the number of quadrants it occupied. Small perforations were those limited to one quadrant and moderate perforations involved two quadrants, including kidney shaped perforations. Large perforations were those occupying 3 quadrants and subtotalperforations were those occupying 4 quadrants bounded by the annulus. Routine haemogram, hearing evaluation by tuning fork tests and Pure tone audiometry as per the method outlined by American Speech and Hearing Association was done all the patients. X-ray mastoids Schuller's view (right and left) was done and the radiological features were noted. Mastoids were labeled a...