2. 7.The most logical explanation for causing swelling beneath the eye
caused by an abscessed maxillary canine is that the
 A. lymphatics drain superiorly in this region.
 B. bone is less porous superior to the root apex.
 C infection has passed into the angular vein which has no valves
 D the root apex lies superior to the attachment of the caninus
and levator labii superioris muscles.


192
a long maxillary canine root allows
infection to erode through the bone superior to
the insertion of
the levator anguli oris muscle and causes an
infraorbital
(canine) space infection. page 294

3. 192
4. Which of the following is NOT a sign or symptom of the myofascial pain
dysfunction syndrome?
 A. Pain.
 B. Muscle tenderness.
 C. Limitation of jaw motion.
 D. "Clicking" or "popping" noise in the joints.
 E Radiographic changes of the joint. E.
 page 633

4. 193
1.Excessive formation of scar tissue beyond the wound margin is called
 A. a fibroma.
 B. a keloid.
 C. a fibro-epithelial polyp.
 D. epithelial hyperplasia.
Factors making scars noticeable
include hypertrophy or keloids, page 576

5. 192
4. A periapical infection of a mandibular third molar may spread by direct
extension to the
1. parapharyngeal space.
2. submandibular space.
3. pterygomandibular space.
4. submental space.
 A. (1) (2) (3)
 B. (1) and (3)
 C. (2) and (4)
 D. (4) only
 E. All of the above. Page 327

6. 192
6. 5. The most likely complication associated with the extraction of an isolated
maxillary second molar is
 A. a dry socket.
 B. nerve damage.
 C. fracture of the malar ridge.
 D. fracture of the tuberosity.
The maxillary tuberosity fractures most
commonly
result from extraction of an erupted maxillary
third molar or from extraction of the second
molar if it is the last tooth in the arch. Page 192

7. 192
6. A patient presenting with diplopia, exophthalmos, nasal bleeding and
swelling, may suffer from a fracture of the
 A. neck of the condyle.
 B. body of the mandible.
 C. zygomatic bone.
 D. maxillary tuberosity.

8. 193
If an odontogenic infection involves the pterygomandibular space, the most
obvious clinical sign will be
 A. trismus.
 B. facial swelling.
 C. swelling in the submandibular area
 . D. rise in body temperature above 39 c (102ºF).
When the pterygomandibular space alone is involved, little or no
facial swelling is observed;
however, the patient almost always has significant trismus
Page 328

9. 194
4.Trismus is most frequently caused by
 A. tetanus.
 B. muscular dystrophy.
 C. infection.
 D. mandibular fracture.
Another important sign is trismus, which is the inability to open
the mouth widely. In odontogenic infections, trismus results
from
the involvement of the muscles of mastication in the
inflammatory
process. Mild trismus can be defined as a maximum
interincisal opening between 20 and 30 mm; moderate trismus
is between 10 and 20 mm; and severe trismus is an interincisal
opening of less than 10 mm. Page 299

10. 196
5. When sutures are used to reposition tissue over extraction sites, they should
be
1. placed over firm bone where possible.
2. interrupted, 15mm apart.
3. firm enough to approximate tissue flaps without blanching.
4. tight enough to produce immediate hemostasis.
 A. (1) (2) (3)
 B. (1) and (3)
 C. (2) and (4)
 D. (4) only
 E. All of the above.

11. 196
4. An acute periapical abscess originating from a mandibular third molar
generally points and drains in the
 A. submandibular space.
 B. pterygomandibular space.
 C. buccal vestibule.
 D. buccal space.
third molar infections
almost always erode through the lingual cortical plate. The
mylohyoid muscle determines whether infections that drain
lingually go superior to that muscle into the sublingual
space or below it into the submandibular space.
Page294determines whether infections that drain