ORTHODONTICS
Table 1: Pre and post treatment cephalometric changes of patients treated by R-appliance
Before Treatment
After Treatment
Difference
Landmark
P Value
Mean
SD
Mean
SD
Mean
SD
SNA °
80
2.6
79.8
2.9
-0.3
1.8
0.5
SNB °
72.8
2.2
76
1.8
3.3
1.5
0.001*
ANB °
7.3
2
4.1
1.8
-3.2
1.6
0.001*
Y-axis °
73.5
3.2
72.7
3
-0.8
1.8
0.07
GoGn-SN °
39.2
4.4
38.6
5
0.6
2.7
0.3
Gonial Angle °
133
5.8
132
5.5
-0.8
2.6
0.2
Inclination Angle °
84.5
2.6
85.7
3.8
1.1
4.9
0.3
U1-SN °
102
7
96
6.5
-6.1
5.6
0.001*
IMPA °
101
7.2
98
9.7
-3
5.4
0.02*
Interincisal Angle °
117.6
9.5
127.8
12
10
8
0.001*
U1-Na (mm)
4
3
2.1
2.6
-1.8
3.4
0.02*
L1-NB (mm)
4.6
1
4.5
1.4
-0.1
0.4
0.6
Occlusal to SN °
23.9
3.5
23.6
3.8
-0.2
3.3
0.7
Jarabak (%)
59.2
3.4
61
3.5
1.7
2.5
0.007*
* P value was set at 0.05
Discussion:
Class II division I malocclusion presents either
with a prognathic maxilla and a normal mandible,
or a normal maxilla and a retrognathic mandible,
or even a combination of both. In this study all the
case ́