Hi there. This is Dr Satya Kiran ENT and Cochlear implant surgeon from Hyderabad. The goal of mastoid surgery which was done 10 years back is to make ear safe. The next goals are dryness and function i.e hearing. Hearing is third in the list. The Surgeon who has done surgery might have done well.
Coming to restoration of hearing, yes we can restore near normal hearing by another surgery called ossiculoplasty or hearing
aids or implantations once we know the type & degree of hearing loss by audiometry & CT scan if temporal (ear) bones