title: [Evaluation of safety on the noise of drills in the tympanoplasty].
abstract: OBJECTIVE
  To investigate the effect of noise generated by the otologic drills and suctions on the cochlear of the operated and nonoperated ear.
  
  
  METHODS
  To examine the noise generated by the different kind of drills and suctions in tympanoplasty, the ND10 Sound Level Meter (Beijing) was used. The bone-conduction thresholds was measured before and one month after operation respectively in both ears.
  
  
  RESULTS
  Sound pressure levels for the otologic drills and suctions were 82-106 dB and 71-84 dB, respectively. There was no statistically significant difference between pre-noise and one-month post-noise bone-conduction thresholds in both operated and nonoperated ears.
  
  
  CONCLUSIONS
  It is safety to use otologic drills and suctions for the patients. There is no apparent harmful effect on the function of cochlear in both ears for the noise of using drills and suctions in tympanoplasty.
authors.affiliation: Department of Otorhinolaryngology, Eye Ear Nose & Throat Hospital of Fudan University, Shanghai, 200031, China.
authors.forename: Bing
authors.initials: B
authors.lastname: Chen
authors.forename: Yucheng
authors.initials: Y
authors.lastname: Wang
authors.forename: Dehui
authors.initials: D
authors.lastname: Wang
authors.forename: Zhengmin
authors.initials: Z
authors.lastname: Wang
mesh_terms: D005069:Evaluation Studies as Topic; D005260:Female; D006317:Hearing Loss, Noise-Induced / Q000209:etiology / Q000517:prevention & control*; D006801:Humans; D008297:Male; D009622:Noise / Q000009:adverse effects*; D010033:Otitis Media / Q000601:surgery; D010036:Otolaryngology / Q000295:instrumentation; D013016:Sound / Q000009:adverse effects; D013396:Suction / Q000009:adverse effects*; D014433:Tympanoplasty