Sound energy absorbance characteristics of cartilage grafts used in type 1 tympanoplasty

摘要: Abstract Objective The purpose of this prospective case-control study is to evaluate the sound energy absorbance characteristics cartilage grafts in patients, who have undergone type 1 tympanoplasty. Methods Thirty-four operated ears 32 patients and 70 35 control subjects were included. Differences pure-tone audiometry thresholds wideband ambient-pressure ratios with respect graft material, thickness, surface area ratio elapsed time after surgery analyzed. Receiver operating curve was generated detect level at which reconstructed tympanic membrane behaves as ‘near-normal membrane’. Results In surgical group, all 1/2-octave band frequencies significantly worse than normal ears. Energy 2000 2828 Hz higher tragal grafts. Higher 250–750 Hz range obtained 400 μm Conclusion Even though no differences hearing observed; affected course tympanoplasty evidenced by tympanometry.