Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Ortho Therapy > Cephalometrics > Flashcards

Cephalometrics Flashcards

1
Q

Define Sella

A

The midpoint of the sella tursica

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Define Nasion

A

The most anterior part of the frontonasal suture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Define Orbitale

A

The most inferior, anterior point on the margin of the orbit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Define A point

A

The deepest concavity in the anterior profile of the maxilla

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Define B point

A

The deepest concavity in the anterior surface of the mandible

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Define Anterior Nasal Spine

A

The tip of the anterior nasal spine of the maxilla

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Define Pogonion

A

The most anterior point on the mandibular symphysis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Define Menton

A

The lowest point on the mandibular symphysis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Define Gonion

A

The most inferior, posterior point on the angle of the mandible

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Define Porion

A

The upper midpoint on the external auditory meatus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Define Gnathion

A

The most anterior, inferior point of the mandibular symphysis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Define Posterior Nasal Spine

A

The tip of the posterior nasal spine of the maxilla

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What are the 3 categories of ANB angles?

A
  • class I = 2-4 degree
  • class II = more than 4 degree
  • class III = less than 2 degree
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Why are cephs used in orthodontics?

A
  • diagnosis and treatment planning
  • during active treatment - functional
  • towards end of treatment - assess proclination of incisors and if bonded ret needed
  • assessing and monitoring growth
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

How can a ceph be standardised?

A
  • patients head should be in natural head posture with the Frankfort plane horizontal
  • cephalostat - head postitioner with ear rods
  • X-ray source - 5 feet from patient
  • aluminium wedge - soft tissue definition
  • film
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is a cephalometric radiograph?

A

A standardised lateral view of the facial bones and soft tissues

17
Q

Define Articulare

A

The point of intersection of the posterior margin of the ascending mandibular ramus and the outer margin of the posterior cranial base

18
Q

On a cephalometric tracing which plane is considered a stable structure from 7 years of age?

A

Anterior cranial base (S-N)

19
Q

Which points connect to make the Frankfort plane?

A

Porion and orbitale

20
Q

Which points connect to make the maxillary plane?

A

Anterior nasal spine and posterior nasal spine

21
Q

Which points connect to make the mandibular plane?

A

Gonion and menton

22
Q

Which points connect to make the SN plane?

A

Sells and nasion

23
Q

What errors can occur during cephalometrics?

A
  • errors of projection

* errors of indentification

24
Q

How can errors be reduced during cephalometrics?

A
  • careful selection of analysis
  • understanding point definition
  • good quality films
  • care when interpreting results
25
Q

Why is a lateral ceph used in orthodontics?

A
  • aid treatment planning and diagnosis
  • assess skeletal pattern - AP and vertical
  • during treatment - post functional stage
  • monitor growth
  • orthographic surgery cases
  • assess soft tissues
  • assess pathology
  • research and audit (with ethical consent)
26
Q

What is the average angle of SNA?

A

81 +/- 3

27
Q

What is the average angle of SNB?

A

78 +/- 3

28
Q

What is the average angle of ANB?

A

3 +/- 2

29
Q

What is the average MMPA angle?

A

27 +/- 5

30
Q

What is the average percentage for lower face height?

A

55%

31
Q

What’s the average angle for upper incisors to maxillary plane?

A

109 +/- 6

32
Q

What’s the average angle for lower incisors to mandibular plane?

A

93 +/- 6

33
Q

What’s the average interincisal angle?

A

135 +/- 5

34
Q

What does an aluminium wedge to?

A

Increases soft tissue definition

35
Q

How much magnification is seen on a cephalometric radiograph?

A

7-8%

36
Q

How far is the X-ray source from the patient for a lateral ceph?

A

5 foot

37
Q

How should a patient bite for a lateral ceph?

A

Patient should bite in intercuspal position

38
Q

What age the the cranial base considered a stable landmark?

A

7 years old

Ortho Therapy (37 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions