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Ortho > Cephalometrics > Flashcards

Cephalometrics Flashcards

1
Q

Space between x-ray tube and film in a cephalometer

A

5 ft

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2
Q

Center of the pituitary fossa of the sphenoid bone.

A

Sella turcica

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3
Q

Most anterior point of the frontonasal suture.

A

Nasion

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4
Q

Lowest point of the inferior margin of the orbit.

A

Orbitale

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5
Q

Where all the attachments of the nose are.

A

Anterior nasal spine

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6
Q

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

A

Posterior nasal spine.

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7
Q

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

A

Pterygomaxillary fissure

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8
Q

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

A

Subspinale

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9
Q

Subspinale is AKA as what?

A

Point A

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10
Q

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

A

Supramentale

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11
Q

Point B is AKA what?

A

Supramentale.

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12
Q

The most anterior point of the chin at midline.

A

Pogonion

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13
Q

The lowest point on the chin.

A

Menton

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14
Q

Most inferior, posterior point on the jaw angle.

A

Gonion

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15
Q

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

Between pogonion and menton.

A

Gnathion

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16
Q

The most inferior midline point on the mandibular symphysis.

A

Menton

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17
Q

The most anterior point on the contour of the chin.

A

Pogonion

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18
Q

Midpoint on the upper edge of the external auditory meatus.

A

Porion

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19
Q

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

A

Basion

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20
Q

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

A

SNA Angle

Sella-Nasion-Point A

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21
Q

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

A

SNB Angle.

Sella-Nasion-Point B

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22
Q

Value of SNA

A

82 +/- 6 degrees

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23
Q

Value of SNB

A

80 +/- 3 degrees

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24
Q

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

Skeletal class?

A

Protrusive compared to the cranial Base.

Skeletal Class II

25
Q

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

Skeletal class?

A

Retrusive.

Skeletal Class III

26
Q

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

A

Protrusive skeletal class III

27
Q

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

A

Retrusive, skeletal class II

28
Q

Anterior-Posterior relationship of the maxilla to the mandible.

A

ANB

29
Q

ANB Value

A

2 degrees +/- 3

30
Q

ANB greater than 2 is what skeletal relationship?

A

Class II

31
Q

ANB less than 2 is what skeletal relationship?

A

Class III

32
Q

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

A

Interincisal angle.

33
Q

Interincisal angle value

A

130 +/- 6

34
Q

Interincisal angle less than 130 indicates what?

A

Protrusive upper/lower incisors (flared out)

35
Q

Interincisal angle greater than 130 indicates what?

A

Retrusive upper and or lower incisors.

36
Q

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

A 
1 = central incisors
2= lateral incisors

and so on…

37
Q

Angulation between the upper central and NA.

A

1 to NA

38
Q

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

A

4

39
Q

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

A

20 degrees

4 mm

40
Q

Nasion to Porion

A

Facial plane

41
Q

Facial plane to Frankfort Plane

A

Facial Angle

42
Q

From sella to gnathion.

A

Y-axis

43
Q

Y-axis angle

A

Y-axis to Frankfort plane

44
Q

Value of Y-axis angle

A

59 degrees +/- 4

45
Q

Y-axis angle less than 59 indicates what?

A

More horizontal growth of the mandible.

46
Q

Y-axis angle greater than 59 indicates what?

A

More vertical growth of the mandible.

47
Q

Mandibular plane

A

Gonion to Gnathion

48
Q

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

A

32 degrees.

49
Q

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

A

Open bite tendency

50
Q

Plane from incisors to molars

A

Occlusal plane

51
Q

Anterior to Posterior nasal spine

A

Palatal Plane

52
Q

Anterior cranial base

A

Nasion to sella

53
Q

Posterior cranial base

A

Sella to Basion

54
Q

Total anterior facial height.

A

Nasion to mention

55
Q

Total posterior facial height.

A

Sella to Gonion

56
Q

Upper anterior facial height.

A

Nasion to Anterior Nasal Spine

57
Q

Lower anterior facial height.

A

ANS to menton

58
Q

UAFH:LAFH = ?

A

1:1.21

Ortho (13 decks)

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