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The aim of this study was to determine the effects of orthognathic surgery on middle ear condition assessed by tympanometry.The subjects were 239 patients in whom jaw deformities were surgically corrected. Bilateral sagittal split osteotomies were performed in 80 patients and a combination of Le Fort I osteotomy and bilateral sagittal split osteotomies was used in 159 patients. Tympanometry was performed...