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1)surgery
is sometimes required to rebuild the bone that has been destroyed.

2)on
examination you will be asked a lot of questions on your habits and be given
thorough examination of your oral cavity.

3) surgical
operations on teeth and the oral cavity have been known since ancient times.

4) periapical
radiographs are always taken to check for a root fracture.

5) currently
the light activated glass ionomer products are being used extensively as lines.

6) the
dentist was brought all the sterilized instruments and the operation began.

7) that
calcium hydroxide possesses a strong antibacterial capacity has already been
recognized at the time of its introduction.

8) healing
of periradicular inflammation may not take place until all bacteria have been

eliminated
from the root canal system.

9) the
proteins of the fibrils and dentinal matrix are being metabolized largely by
pyogenic organisms giving rise to poisonous end products swallowed by the
patient.

10)a new
ultrasound device has been designed to treat an infected tooth without causing
any pain.

1) is  required (present simple passive);  has been destroyed (present perfect passive)2) will be asked  and be given (future simple passive) 3) have been known (present perfect passive) 4) are taken (present simple passive) 5) are being used (present progressive passive)6) was brought (past simple passive); began (past simple active) 7) possesses (present simple active); has already been recognized (present perfect passive)8) have been eliminated (present perfect passive) 9) are being metabolized (present progressive passive)10) has been designed (present perfect passive)