Hearing: safe for inner ear, good recovery in 34 patients with tympanoplasty type I, II, III: 35.3% with PTA ≤ 30 dB (mild hearing loss); ABG = 24.0 ± 9.8 dB, 50% best results with ABG ≤ 20 dB, 70.6% good results with ABG ≤ 30 dB.