TMJ/Mandible Test

Question 1

Which positioning line is perpendicular to the image receptor for a PA projection of the mandibular rami?

a.) GAL
b.) OML
c.) AML
d.) IOML

Answer 1

b.) OML

Question 2

Which skull type is narroe from side to side?

a.) brachycephalic
b.) mesocephalic
c.) dolichocephalic

Answer 2

c.) dolichocephalic

Question 3

Which bone of the orbit contains the tear ducts?

a.) lacrimal
b.) maxilla
c.) zygoma
d.) sphenoid

Answer 3

a.) lacrimal

Question 4

The CR for the SMV method of the mandible enters:

a.) at the lips
b.) midway between the angle of the mandible
c.) at the acanthion
d.) 3 inches inferior to the symphisis

Answer 4

b.) midway between the angles of the mandible

Question 5

In the axial AP (townes) mandible projection with the OML perpendicular to the IR, the central ray is:

a.) 25 to 30 degrees cephalic to the area of interest
b.) 30 degrees caudal, entering at the nasion
c.) 35 egrees caudal, entering 1 inch above the glabella
d.) perpendicular to the image receptor at the lips

Answer 5

c.) 35 degrees caudal, entering 1 inch above the glabella

Question 6

Situation: A patient enters the ER with a possible fracture of the proximal ramus of the mandible. Which of the following routines would best diagnose this fracture?

a.) PA mandible projection, axiolateral oblique projection with a 45 degrees rotation towrads film, and submentovertex projection
b.) PA axial mandible projection, axiolateral oblique projection with no rotation and a 35 degrees AP axial projection
c.) parietoacanthial projection, axiolateral oblique projection with a 30 degree rotation toward film, and lateral facial bone projection
d.) PA mandible projection, axiolateral oblique projection with a 45 degree rotation, and 35 degree AP axial projection

Answer 6

b.) PA axial mandible projection, axiolateral oblique projection with no rotation, and a 35 degree AP axial projection

Question 7

Why is the chin extended for an axiolateral oblique projection of the mandible?

a.) to open up the TMJ
b.) to prevent superimposition upon the cervical spine
c.) to profile the condylar process
d.) to better visualize the mentum

Answer 7

b.) to prevent superimposition upon the cervical spine

Question 8

The ________ is located in the apex of the orbit.

a.) inion
b.) sella turcica
c.) superior orbital fissure
d.) optic nerve

Answer 8

d.) optic nerve

Question 9

On the PA and PA axial projection for mandibular rami the patients head rests on:

a.) nose and chin
b.) nose, cheek and chin
c.) forehead, nose and cheek
d.) forehead and nose

Answer 9

d.) forehead and nose

Question 10

The upper and lower teeth are embedded in the:

a.) symphisis menti
b.) palantine processes
c.) alveolar processes
d.) condyloid processes

Answer 10

c.) alveolar processes

Question 11

A radiograph of a submentovertex projection reveals that the mandible is superimposed over the ethmoid and sphenoid sinsues. Which of the following modifications will eliminate this problem?

a.) perform the projection with the patient supine
b.) perform the axiolateral oblique instead of the submentovertex
c.) increase the extension of the head and neck
d.) increase the flexion of the head and neck

Answer 11

c.) increase the extension of the head and neck

Question 12

The modified law method for TMJ requires a _________ degree rotation of the skull and a ____________ degree angle of the CR

a.) 5; 0
b.) 0; 25 to 30
c.) 10; 15
d.) 15; 15

Answer 12

d.) 15;15

Question 13

How much skull rotation (from a lateral position) is required to place the ramus parallel to the image receptor for the axiolateral oblique projection of the mandible?

a.) 45 degrees
b.) 30 degrees
c.) none (keep the skull in lateral position)
d.) 53 degrees

Answer 13

c.) none (keep the skull in lateral position

Question 14

The CR for PA axial projection of the mandible should be:

a.) perpendicular
b.) 35 degrees cephalic
c.) 15 degrees cephalic
d.) 20-25 degrees cephalic

Answer 14

d.) 20-25 degrees cephalic

Question 15

Which line should be perpendicular to the IR for a modified waters positoin of the orbit?

a.) IPL
b.) LML
c.) MML
d.) OML

Answer 15

b.) LML

Question 16

Which position will best demonstrate a fracture of the condyle of the ramus?

a.) open mouth
b.) closed mouth

Answer 16

b.) closed mouth

Question 17

How many bones make up the calvaria and the floor of the skull?

a.) 24
b.) 8
c.) 14
d.) 22

Answer 17

b.) 8

Question 18

In an axiolateral oblique (modified law) temporal bones position, the central ray should be at a :

a.) 15 degree caudal angle, entering approximately 1-1/2 inches superior to the uppermost EAM
b.) 30 degree caudal angle exiting through the EAM
c.) 20 degree cephalic angle, entering approximately 2 inches below the EAM
d.) 12 degree cephald angle, entering approximately 2 inches posterior to the uppermost EAM

Answer 18

a.) 15 degree caudal angle, entering approximately 1-1/2 inches superior to the uppermost EAM

Question 19

Which of the following pertains to an AP axial (towne) cranial image obtained with the patients face rotated toward the right side?

a.) the atlas posterior arch is demonstrated within the foramen magnum
b.) the distance from the dorsum sellae to the lateral foramen magnum on the patients left side is narrower than on the right side
c.) the distance from the dorsum sellae to the lateral foramen magnum on the patients right side is narrower than on the left side
d.) the dorsum sellae is demonstrated superior to the foramen magnum

Answer 19

c.) the distance from the dorsum sellae to the lateral foramen magnum on the patients right side is narrower than on the left side

Question 20

Ideally, the _________ should be perpendicular to the IR for an AP axial of the TMJ

a.) IOML
b.) IPL
c.) AML
d.) OML

Answer 20

d.) OML

Question 21

A patient is unable to sufficiently hyperextend the neck for an SMV (shueller) cranial image. How should the positioning setup be adjusted for an optimal image to be obtained?

a.) align the central ray perpendicular to the IOML
b.) the iamge cannot be obtained
c.) align the central ray perpendicular to the OML
d.) extend the patients neck as far as possible, and use a perpendicluar central ray

Answer 21

a.) align the central ray perpendicular to the IOML

Question 22

At what landmark should the CR be centered for a lateral projection of the orbit?

a.) outer canthus
b.) inferior to the outer canthus
c.) at the cheekbone
d.) midway between outer canthus and EAM

Answer 22

a.) outer canthus

Question 23

If a patient is positioned correctly for an AP axial of the mandible, then which of the following evaluation criteria is true:

a.) there is no superimposition of rami
b.) the condyles are projected anterior to the petrous
c.) condyloid processes are seen with equal distances to the lateral borders of the cervical spine
d.) there is superimposition of rami

Answer 23

c.) condyloid processes are seen with equal distances to the lateral borders of the cervical spine

Question 24

the gonion is: (choose all that apply)

a.) the angle of the mandible
b.) part of the temporomandibular fossa
c.) the junction of the body and the ramus
d.) also known as the mental protuberance

Answer 24

a.) the angle of the mandible
c.) the junction of the body and the ramus

Question 25

What is the CR for the axiolateral (shueller) projection of the TMJs? (choose best 2)

1.) perpendicular
2.) 25-30 degrees caudal
3.) 25 degrees cephalad
4.) 1/2’’ anterior and 2’’ superior to upside EAM
5.) 1.5’’ superior to upside EAM
6.) 1/2’’ anterior and 1’’ superior to upside EAM

Answer 25

2 and 4

Question 26

What is the maximum CR angulation used for the axiolateral oblique projection of the mandible?

a.) 45 degrees
b.) 25 degrees
c.) 10 to 15 degrees
d.) 30 degrees

Answer 26

b.) 25 degrees

Question 27

The coronoid process articulates with:

a.) zygomatic bone
b.) nothing; it serves as a site for muscle attachment
c.) maxilla
d.) the temporal bone to make the TMJ

Answer 27

b.) nothing; it serves as a site for muscle attachment

Question 28

Where does the CR exit for the PA axial projection of the mandible?

a.) nasion
b.) acanthion
c.) mentum
d.) junction of the lips

Answer 28

b.) acanthion

Question 29

The pituitary gland (hypophysis cerebri) is associated with and protected by the _________ bone.

a.) sphenoid
b.) ethmoid
c.) temporal
d.) palantine

Answer 29

a.) sphenoid

Question 30

The ________ portion forms the inferior and posterior part of the temporal bone walls.

a.) styloid
b.) petrous
c.) mastoid
d.) tympanic

Answer 30

c.) mastoid

Question 31

The CR for an AP axial view of the TMJ should be centered:

a.) 3 inches above the nasion
b.) 1 inch superior to the EAM
c.) 1 inch posterior to the outer canthus
d.) at the glabella

Answer 31

a.) 3 inches above the nasion

Question 32

The axiolateral oblique projection is used to demonstrate the mandible. How is the head positioned to demonstrate the symphisis of the mandible?

a.) true lateral
b.) 15 degrees toward the IR
c.) 45 degrees toward the IR
d.) 30 degrees toward the IR

Answer 32

c.) 45 degrees toward the IR

Question 33

How many bones are contained in the skull?

Answer 33

22

Question 34

Which projection best demonstrates the floor of the orbits?

a.) PA axial (caldwell) without modification
b.) parietoacathial (waters)
c.) lateral facial bones
d.) modified parietoacanthial (modified waters)

Answer 34

d.) modified parietoacanthial (modified waters)

Question 35

Where does the CR exit for the PA projection of the mandible?

a.) junction of the lips
b.) mentum
c.) nasion
d.) acanthion

Answer 35

a.) junction of the lips