SQL & PL/SQL :: How To Get Valid Data After Skip Bad Block

I have a table and no related backup available.If some block is broken, then , how can I get the data with the blocks that are not broken?

Test environment:

SQL> create tablespace test datafile '/u01/app/oracle/oradata/test/test.dbf' size 1m;

Tablespace created.

SQL> create table scott.test_bad_block (id int, name varchar2(20)) tablespace test;

Table created.

SQL> r
1 begin
2 for i in 1..1000000 loop
3 insert into scott.test_bad_block values (i, 'test' || i);
4 commit;
5 end loop;
6* end;
begin
*
ERROR at line 1:
ORA-01653: unable to extend table SCOTT.TEST_BAD_BLOCK by 8 in tablespace TEST
ORA-06512: at line 3
SQL> select count(*) from scott.test_bad_block;

COUNT(*)
----------
40984

Now I know, I have 40984 rows in the table.In order to simulating the block corrupt, I shutdown the database and I used the bvi (a binary file editor to modify a line of record) , then start the database, when I am issuing the same statement, the problem shows:

SQL> select count(*) from scott.test_bad_block;
select count(*) from scott.test_bad_block *
ERROR at line 1:
ORA-01578: ORACLE data block corrupted[b] (file # 7, block # 72)[/b]
ORA-01110: data file 7: '/u01/app/oracle/oradata/test/test.dbf'

It says that the block is corrupted.Now, here is what I can do to get the data right now:

#get the object id
SQL> r
1* select OBJECT_NAME, DATA_OBJECT_ID from dba_objects where owner='SCOTT' and object_name='TEST_BAD_BLOCK'

OBJECT_NAME DATA_OBJECT_ID
-------------------- --------------
TEST_BAD_BLOCK 10327
[code]....

Here are my questions:

1. How can I know, that if there is valid data(the block is not corrupted) after this bad block?
2. How can I get the data after this bad block?