Cephalometrics

Question 1

Space between x-ray tube and film in a cephalometer

Answer 1

5 ft

Question 2

Center of the pituitary fossa of the sphenoid bone.

Answer 2

Sella turcica

Question 3

Most anterior point of the frontonasal suture.

Answer 3

Nasion

Question 4

Lowest point of the inferior margin of the orbit.

Answer 4

Orbitale

Question 5

Where all the attachments of the nose are.

Answer 5

Anterior nasal spine

Question 6

Tip of the posterior spine of the palatine bone in the hard palate where the third molars are found.

Answer 6

Posterior nasal spine.

Question 7

Space between the retromolar tuberosity of the maxilla and the pterygoid process.

Answer 7

Pterygomaxillary fissure

Question 8

The deepest midline point of the maxilla between the anterior nasal spine and the prosthion.

Answer 8

Subspinale

Question 9

Subspinale is AKA as what?

Answer 9

Point A

Question 10

The deepest midline concavity of the mandibular symphysis between the infradentale and pogonion.

Answer 10

Supramentale

Question 11

Point B is AKA what?

Answer 11

Supramentale.

Question 12

The most anterior point of the chin at midline.

Answer 12

Pogonion

Question 13

The lowest point on the chin.

Answer 13

Menton

Question 14

Most inferior, posterior point on the jaw angle.

Answer 14

Gonion

Question 15

Midway between the most anterior and inferior points on the bony chin.

Between pogonion and menton.

Answer 15

Gnathion

Question 16

The most inferior midline point on the mandibular symphysis.

Answer 16

Menton

Question 17

The most anterior point on the contour of the chin.

Answer 17

Pogonion

Question 18

Midpoint on the upper edge of the external auditory meatus.

Answer 18

Porion

Question 19

Lowermost point of the anterior margin of the foramen magnum in the mid-sagittal plane.

Answer 19

Basion

Question 20

This angle represents the relationship of the maxilla to the cranial base.

Answer 20

SNA Angle

Sella-Nasion-Point A

Question 21

This angle represents the relationship of the mandible to the cranial base.

Answer 21

SNB Angle.

Sella-Nasion-Point B

Question 22

Value of SNA

Answer 22

82 +/- 6 degrees

Question 23

Value of SNB

Answer 23

80 +/- 3 degrees

Question 24

If SNA is greater than 82, the maxilla is what?

Skeletal class?

Answer 24

Protrusive compared to the cranial Base.

Skeletal Class II

Question 25

If the SNA is less than 82, the maxilla is what? Skeletal class?

Answer 25

Retrusive. Skeletal Class III

Question 26

If the SNB is greater than 80, the mandible is what?

Answer 26

Protrusive skeletal class III

Question 27

If the SNB is less than 80, the mandible is what?

Answer 27

Retrusive, skeletal class II

Question 28

Anterior-Posterior relationship of the maxilla to the mandible.

Answer 28

ANB

Question 29

ANB Value

Answer 29

2 degrees +/- 3

Question 30

ANB greater than 2 is what skeletal relationship?

Answer 30

Class II

Question 31

ANB less than 2 is what skeletal relationship?

Answer 31

Class III

Question 32

Angular relationship of upper and lower incisor teeth to each other.

Answer 32

Interincisal angle.

Question 33

Interincisal angle value

Answer 33

130 +/- 6

Question 34

Interincisal angle less than 130 indicates what?

Answer 34

Protrusive upper/lower incisors (flared out)

Question 35

Interincisal angle greater than 130 indicates what?

Answer 35

Retrusive upper and or lower incisors.

Question 36

In ortho, which tooth is number 1? Number 2?

Answer 36

``` 1 = central incisors 2= lateral incisors ``` and so on...

Question 37

Angulation between the upper central and NA.

Answer 37

1 to NA

Question 38

If the 1 to NA angle is 22 degrees, how many mm anterior to the NA line is the central incisor?

Answer 38

4

Question 39

When the lower central incisor to NB angle is _____ degrees, the most prominent part of the crown usually measures ____ mm in front of NB.

Answer 39

20 degrees 4 mm

Question 40

Nasion to Porion

Answer 40

Facial plane

Question 41

Facial plane to Frankfort Plane

Answer 41

Facial Angle

Question 42

From sella to gnathion.

Answer 42

Y-axis

Question 43

Y-axis angle

Answer 43

Y-axis to Frankfort plane

Question 44

Value of Y-axis angle

Answer 44

59 degrees +/- 4

Question 45

Y-axis angle less than 59 indicates what?

Answer 45

More horizontal growth of the mandible.

Question 46

Y-axis angle greater than 59 indicates what?

Answer 46

More vertical growth of the mandible.

Question 47

Mandibular plane

Answer 47

Gonion to Gnathion

Question 48

Value of the angle between mandibular plane and SN plane is what?

Answer 48

32 degrees.

Question 49

Patients with a high mandibular plane- SN plane angle have what?

Answer 49

Open bite tendency

Question 50

Plane from incisors to molars

Answer 50

Occlusal plane

Question 51

Anterior to Posterior nasal spine

Answer 51

Palatal Plane

Question 52

Anterior cranial base

Answer 52

Nasion to sella

Question 53

Posterior cranial base

Answer 53

Sella to Basion

Question 54

Total anterior facial height.

Answer 54

Nasion to mention

Question 55

Total posterior facial height.

Answer 55

Sella to Gonion

Question 56

Upper anterior facial height.

Answer 56

Nasion to Anterior Nasal Spine

Question 57

Lower anterior facial height.

Answer 57

ANS to menton

Question 58

UAFH:LAFH = ?

Answer 58

1:1.21