Do you have valid backup with rman ?If yes,then follow

I)
a) Shutdown your database
b) start rman

rman target /


Use blockrecovery to recover the corrupted block(s)

c)BACKUP VALIDATE CHECK LOGICAL database;

d)BLOCKRECOVER CORRUPTION LIST;

e)startup database

Should be good to go......

if not

use dbms_repair to mark them as corrupt this is the only option if you dont have any backups.