[Comparative analysis of the hearing of three type reconstruction material in type Ⅱ tympanoplasty of 286 cases].

Objective:To compare the effect on hearing of different reconstruction material in type Ⅱ tympanoplasty. Methods:Retrospectively analysis of 286 patients who accepted type Ⅱ tympanoplasty. The air-bone gap of 0.5, 1, 2, 4 kHz was analyzed before and after operation. We compared the hearing change and the complications between each group. Results:In incus group, the manubrium mallei and the head of stapes were connected with shaped incus, PORP group were implanted with PORP during operation, and cartilage group used auricular cartilage to cover the head of stapes. There was no significant difference in 4 kHz air-bone gap（ABG） between the cartilage group and PORP group either before or after the operation （P>0.05）. Air-bone gap of 0.5, 1, 2, 4 kHz of the incus group, and the 0.5, 1, 2 kHz of the cartilage and PORP group were significantly reducedafter the operation（P<0.05）. One patient got severe sensorineural hearing loss in incus group after the operation. The high frequency of bone conduction decreased in 1 patient（2, 4 kHz）.In the incus group, 3 patients had temporary facial paralysis after operation. Incus and cartilage group each have 1 patient with dizziness after the operation. Incus, cartilage and PORP group had 5, 3 and 11 patients with perforation again respectively. There was extrusion occurred in 1 patient of PORP group. Conclusion:Self incus, cartilage and PORP can be used in typeⅡ tympanoplasty, the effect of hearing reconstruction is similar. The first two are more economical, PORP implantation has the lowest technical difficulty and the most widely application, but there is a certain risk of extrusion .