Norms Flashcards
SNA
82
SNB
80
ANB
2
SN-MP
32
FMA
24
IMPA
93
U1-SN
103
U1-NA
4
L1-NB
4
U lip - E line
-6
L lip - E line
-2
What is SMI 6?
peak statural growth
Capping of the third finger, middle phalanx occurs
What is SMI 7?
Peak jaw velocity
capping of the fifth finger, middle phalanx occurs
About how much growth remains at SMI 6?
3 more years
25-65%
What is the ratio of vertical condylar growth to horizontal condylar growth?
8:1 mm ratio Vert:hor growth
Combined, the U and L 6s erupt ~ ___mm per year.
2 (1mm each)
Except for gonial angle, most angles will change < ___ degrees during 2.5 years of treatment
1 degree
True or false… SNA does not change significantly with growth. Therefore, if you see a change in SNA it is due to treatment
true
maxilla and nasion keep pace with each other.
What is are the ANB norms for the following ages?
6
9
12
15
6yo = 4-5 degrees
9yo = 3-4 degrees
12yo = 3-4 degrees
15yo = 2-3 degrees
How much does SNA change per year due to growth?
0.1 degree
How much does SNB change per year due to growth?
0.2 degrees
How much does ANB change per year due to growth?
-0.1 degree
How much does SN-MP change per year due to growth?
-0.3 degrees
How much does FMA change per year due to growth?
-0.3 degrees
How much does the Y-axis change per year due to growth?
-0.1 degree
How much does ANS-PNS change per year due to growth?
+ 0.8mm
How much does Co-Me (Mn length) change per year due to growth?
+2.3mm
How much does Ar-Go-Me (Gonial angle) change per year due to growth?
-0.6 degrees
How much does N-ANS (UAFH) change per year due to growth?
+1.2mm
How much does ANS-Me (LAFH) change per year due to growth?
+1.0mm
How much does S-N-ANS change per year due to growth?
+0.1 degree
How much does S-N-Pg change per year due to growth?
+0.3 degrees
How much does ANS change per year due to growth?
0.7mm anterior/year
How much does Pg change per year due to growth?
0.8mm anterior/year
Describe the changes seen in Condylion per year due to growth.
0.5mm posterior/year
0.3mm inferior/year
How much should you expect the molars and incisors to erupt per year naturally?
1mm
How much should you expect the molar to drift mesially per year naturally?
0.5mm
How much should you expect the incisor to move horizontally per year naturally?
0.3mm
When you are looking at the mandibular superimposition, how much vertical change should you see in Condylion?
2.3mm superior per year
When you are looking at the mandibular superimposition, describe how much change you should see in Gonion due to growth.
1mm posterior per year
0.9mm superior per year
When you are looking at the maxillary superimposition, describe what changes you should see in the orbital floor due to growth.
0.3mm superior per year
0.3mm posterior per year
When you are looking at the maxillary superimposition, describe what changes you should see in PNS due to growth.
0.7mm posterior per year
0.3mm inferior per year
When you are looking at the maxillary superimposition, describe what changes you should see in ANS due to growth.
0.1mm anterior per year
0.6mm inferior per year
When you are looking at the maxillary superimposition, describe what changes you should see in A point due to growth.
0.6mm inferior per year
