BACKGROUND: A @entity2267 resulting from a canal wall down mastoidectomy can result in major morbidity for @entity1 due to different open cavity problems. Mastoid obliteration with reconstruction of the bony external ear canal recreates the normal anatomy to avoid such morbidity. METHODS: This retrospective observational study was conducted for 4 years (between 2008 - 2013) to determine if mastoid obliteration with bioactive glass (Bioglass(  )) following mastoidectomy overcomes the open cavity problems or not. @entity1 with @entity3540 had subjected tomastoidectomy with primary or secondary mastoid obliteration, by using bioactive glass (Bioglass(  )),then our primary outcome measure. RESULTS: Forty @entity1 were interviewed. Forty of them were primary or secondary obliteration after canal wall down mastoidectomy of a primary @entity3540 . The most frequent fate of obliteration or reconstruction of mastoid was Grade 1 (47.5%) then Grade 0 (30%). Postoperative hearing assessment showed that the average (mean) air conduction (0.5-4 KHz) was 31.1 dB and the average (mean) bone conduction (0.5-4 KHz) was 15.5 dB. The gain average in air conduction was 26 dB and in bone conduction it was 0.5 dB. Ear discharge was found in 36 @entity1 (90%) preoperative and it was found only in 6 @entity1 (15%) postoperative, in 4 @entity1 (10%) @entity3540 recidivism or recurrences was present. CONCLUSION: This study shows that the bioactive glass (Bioglass(  )) is one of the beat materials used in mastoidectomy with obliteration of open @entity2267 .

Evaluation of using Bioglass(  ) in obliteration of XXXX .

@entity1 :: ('9606', 'Species') :: ['patients', 'Patients'] @entity3540 :: ('MESH:D002781', 'Disease') :: ['cholesteatoma'] @entity2267 :: ('MESH:D008417', 'Disease') :: ['mastoid cavity']
@entity2267 :: (MESH:D008417,Disease) :: ['mastoid cavity']
