“…Wullstein classified the operations as types I through V, based on the concepts of sound transformation at the oval window and sound protection of the round window. Subsequently, many otologic surgeons contributed to the development and refinement of tympanoplasty techniques [19,20,24,36,67,71,81]. Tympanomastoid surgery is quite successful in controlling infection and preventing recurrent disease, with reported success rates in excess of 80-90% [12,48].…”