Cephalometrics Flashcards Preview

Ortho > Cephalometrics > Flashcards

Flashcards in Cephalometrics Deck (58):
1

Space between x-ray tube and film in a cephalometer

5 ft

2

Center of the pituitary fossa of the sphenoid bone.

Sella turcica

3

Most anterior point of the frontonasal suture.

Nasion

4

Lowest point of the inferior margin of the orbit.

Orbitale

5

Where all the attachments of the nose are.

Anterior nasal spine

6

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

Posterior nasal spine.

7

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

Pterygomaxillary fissure

8

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

Subspinale

9

Subspinale is AKA as what?

Point A

10

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

Supramentale

11

Point B is AKA what?

Supramentale.

12

The most anterior point of the chin at midline.

Pogonion

13

The lowest point on the chin.

Menton

14

Most inferior, posterior point on the jaw angle.

Gonion

15

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

Between pogonion and menton.

Gnathion

16

The most inferior midline point on the mandibular symphysis.

Menton

17

The most anterior point on the contour of the chin.

Pogonion

18

Midpoint on the upper edge of the external auditory meatus.

Porion

19

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

Basion

20

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

SNA Angle

Sella-Nasion-Point A

21

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

SNB Angle.

Sella-Nasion-Point B

22

Value of SNA

82 +/- 6 degrees

23

Value of SNB

80 +/- 3 degrees

24

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

Skeletal class?

Protrusive compared to the cranial Base.

Skeletal Class II

25

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

Skeletal class?

Retrusive.

Skeletal Class III

26

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

Protrusive skeletal class III

27

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

Retrusive, skeletal class II

28

Anterior-Posterior relationship of the maxilla to the mandible.

ANB

29

ANB Value

2 degrees +/- 3

30

ANB greater than 2 is what skeletal relationship?

Class II

31

ANB less than 2 is what skeletal relationship?

Class III

32

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

Interincisal angle.

33

Interincisal angle value

130 +/- 6

34

Interincisal angle less than 130 indicates what?

Protrusive upper/lower incisors (flared out)

35

Interincisal angle greater than 130 indicates what?

Retrusive upper and or lower incisors.

36

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

1 = central incisors
2= lateral incisors

and so on...

37

Angulation between the upper central and NA.

1 to NA

38

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

4

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.

20 degrees

4 mm

40

Nasion to Porion

Facial plane

41

Facial plane to Frankfort Plane

Facial Angle

42

From sella to gnathion.

Y-axis

43

Y-axis angle

Y-axis to Frankfort plane

44

Value of Y-axis angle

59 degrees +/- 4

45

Y-axis angle less than 59 indicates what?

More horizontal growth of the mandible.

46

Y-axis angle greater than 59 indicates what?

More vertical growth of the mandible.

47

Mandibular plane

Gonion to Gnathion

48

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

32 degrees.

49

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

Open bite tendency

50

Plane from incisors to molars

Occlusal plane

51

Anterior to Posterior nasal spine

Palatal Plane

52

Anterior cranial base

Nasion to sella

53

Posterior cranial base

Sella to Basion

54

Total anterior facial height.

Nasion to mention

55

Total posterior facial height.

Sella to Gonion

56

Upper anterior facial height.

Nasion to Anterior Nasal Spine

57

Lower anterior facial height.

ANS to menton

58

UAFH:LAFH = ?

1:1.21