Evaluation Of Safety On The Noise Of Drills In The Middle Ear Surgery

Object: To investigate the effect of noise generated by the otolgic drills and suctions on the cochlear of the operated and non operated ear in the style of antro-atticotomy and modified radical mastoidectomy. Methods:To examine the noise generated by the different kind of drills and suctions in the middle ear operation ,the ND10 Sound Level Meter was used. The bone-conduction thresholds measured ranged from 0.5KHz to 4KHz. ResuIts:Sound pressure levels for the otologic drills and suctions were 86～ 115 dB(A) and71～84 dB(A) respectively.The bone-conduction thresholds of 2KHz, 4KHz high frequency in all the patients one month post-operation are higher than that of the pre-operation and the increase of bone-conduction thresholds are more obvious with the expanding surgery area and the otologic drills using time. There was statistically significant difference between pre-noise and one-month post-noise bone-conduction thresholds of 2KHz, 4KHz in both operated and nonoperated ears of modified radical mastoidectomy. While there was no statistically significant difference...