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Ninty-two children with sensorineural hearing loss, who have used powerful hearing aids for a long time, were investigated to study whether their hearing aids caused traumatic injury to their residual hearing. Six cases, especially two of them, were suspected to have traumatic hearing loss. But they could not be distinguished from progressive sensorineural hearing loss. Many cases resulted in deterioration of hearing, despite of removal of the hearing aids and some medication. When a powerful output hearing aid is applied to children with hearing loss, audiometric follow-up and hearing aid evalution are necessary.