Norms

Question 1

SNA

Answer 1

82

Question 2

SNB

Answer 2

80

Question 3

ANB

Answer 3

2

Question 4

SN-MP

Answer 4

32

Question 5

FMA

Answer 5

24

Question 6

IMPA

Answer 6

93

Question 7

U1-SN

Answer 7

103

Question 8

U1-NA

Answer 8

4

Question 9

L1-NB

Answer 9

4

Question 10

U lip - E line

Answer 10

-6

Question 11

L lip - E line

Answer 11

-2

Question 12

What is SMI 6?

Answer 12

peak statural growth

Capping of the third finger, middle phalanx occurs

Question 13

What is SMI 7?

Answer 13

Peak jaw velocity

capping of the fifth finger, middle phalanx occurs

Question 14

About how much growth remains at SMI 6?

Answer 14

3 more years

25-65%

Question 15

What is the ratio of vertical condylar growth to horizontal condylar growth?

Answer 15

8:1 mm ratio Vert:hor growth

Question 16

Combined, the U and L 6s erupt ~ ___mm per year.

Answer 16

2 (1mm each)

Question 17

Except for gonial angle, most angles will change < ___ degrees during 2.5 years of treatment

Answer 17

1 degree

Question 18

True or false… SNA does not change significantly with growth. Therefore, if you see a change in SNA it is due to treatment

Answer 18

true

maxilla and nasion keep pace with each other.

Question 19

What is are the ANB norms for the following ages?

6
9
12
15

Answer 19

6yo = 4-5 degrees
9yo = 3-4 degrees
12yo = 3-4 degrees
15yo = 2-3 degrees

Question 20

How much does SNA change per year due to growth?

Answer 20

0.1 degree

Question 21

How much does SNB change per year due to growth?

Answer 21

0.2 degrees

Question 22

How much does ANB change per year due to growth?

Answer 22

-0.1 degree

Question 23

How much does SN-MP change per year due to growth?

Answer 23

-0.3 degrees

Question 24

How much does FMA change per year due to growth?

Answer 24

-0.3 degrees

Question 25

How much does the Y-axis change per year due to growth?

Answer 25

-0.1 degree

Question 26

How much does ANS-PNS change per year due to growth?

Answer 26

+ 0.8mm

Question 27

How much does Co-Me (Mn length) change per year due to growth?

Answer 27

+2.3mm

Question 28

How much does Ar-Go-Me (Gonial angle) change per year due to growth?

Answer 28

-0.6 degrees

Question 29

How much does N-ANS (UAFH) change per year due to growth?

Answer 29

+1.2mm

Question 30

How much does ANS-Me (LAFH) change per year due to growth?

Answer 30

+1.0mm

Question 31

How much does S-N-ANS change per year due to growth?

Answer 31

+0.1 degree

Question 32

How much does S-N-Pg change per year due to growth?

Answer 32

+0.3 degrees

Question 33

How much does ANS change per year due to growth?

Answer 33

0.7mm anterior/year

Question 34

How much does Pg change per year due to growth?

Answer 34

0.8mm anterior/year

Question 35

Describe the changes seen in Condylion per year due to growth.

Answer 35

0.5mm posterior/year 0.3mm inferior/year

Question 36

How much should you expect the molars and incisors to erupt per year naturally?

Answer 36

1mm

Question 37

How much should you expect the molar to drift mesially per year naturally?

Answer 37

0.5mm

Question 38

How much should you expect the incisor to move horizontally per year naturally?

Answer 38

0.3mm

Question 39

When you are looking at the mandibular superimposition, how much vertical change should you see in Condylion?

Answer 39

2.3mm superior per year

Question 40

When you are looking at the mandibular superimposition, describe how much change you should see in Gonion due to growth.

Answer 40

1mm posterior per year 0.9mm superior per year

Question 41

When you are looking at the maxillary superimposition, describe what changes you should see in the orbital floor due to growth.

Answer 41

0.3mm superior per year 0.3mm posterior per year

Question 42

When you are looking at the maxillary superimposition, describe what changes you should see in PNS due to growth.

Answer 42

0.7mm posterior per year 0.3mm inferior per year

Question 43

When you are looking at the maxillary superimposition, describe what changes you should see in ANS due to growth.

Answer 43

0.1mm anterior per year 0.6mm inferior per year

Question 44

When you are looking at the maxillary superimposition, describe what changes you should see in A point due to growth.

Answer 44

0.6mm inferior per year