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Figure 1.
Invisalign technology displaying upper and lower arch with Mesiodistal dimensions of permanent teeth (300dpi).
Regression parameters for the estimation of mesiodistal dimensions of canine and premolar in each arch for the Australian adolescent population.
Variable (Y)
X
Gender
a
P-value
b
P-value
Adj.R2
SEE
r
Max-CPM
Mandibular Incisors
M
5.09
<0.001
0.725
<0.001
0.543
0.88
0.739
Man-CPM
Mandibular Incisors
M
6.34
<0.001
0.658
<0.001
0.471
0.92
0.688
Max-CPM
Mandibular Incisors
F
7.44
<0.001
0.620
<0.001
0.337
1.04
0.582
Man-CPM
Mandibular Incisors
F
5.59
<0.001
0.635
<0.001
0.386
0.96
0.623
Comparison of actual and predicted mesiodistal dimensions of canine and premolars using Tanaka and Johnston equation using paired t test.
Actual value
Predicted value
Gender
Group variables
N
Mean
SD
SEM
Mean
SD
S.E.M
P-value
M
Max-CPM
177
22.17
1.30
0.10
22.79
0.66
0.05
<0.001*
Man-CPM
177
21.84
1.27
0.10
22.29
0.66
0.05
<0.001*
F
Max-CPM
177
21.84
1.28
0.07
22.62
0.60
0.03
<0.001*
Man-CPM
177
21.33
1.22
0.07
22.12
0.60
0.03
<0.001*
New regression equations for the estimation of mesiodistal dimensions of canine and premolar derived for both males and females of the Australian population.
Arch (Y)
Gender
Equation
r
P-value
Max-CPM
M
5.09 + 0.725 (X)
0.739
<0.001
F
7.44 + 0.620 (X)
0.582
<0.001
Man-CPM
M
6.34 + 0.658 (X)
0.688
<0.001
F
5.59 + 0.635 (X)
0.623
<0.001
Comparison of regression parameters between the present study and other studies.
Constants
Author & Year
Population
Gender
Canine-premolar segment
r
a
B
SEE
R2
Tanaka and Johnston6
White American
M + F
Y1
0.63
10.41
0.51
0.86
0.40
Y2
0.65
9.18
0.54
0.85
0.42
Frankel and Benz21
African American
M
Y1
0.72
9.15
0.58
0.923
–
Y2
0.79
5.97
0.72
0.911
–
F
Y1
0.61
12.83
0.39
0.672
–
Y2
0.66
10.34
0.49
0.709
–
Yuen et al.41
Hongkong Chinese
M
Y1
0.79
7.97
0.66
0.68
0.62
Y2
0.77
8.82
0.58
0.61
0.60
F
Y1
0.65
8.30
0.61
0.81
0.42
Y2
0.69
6.66
0.64
0.82
0.47
Jaroontham and Godfrey19
Thai
M
Y1
0.54
13.36
0.41
0.88
0.29
Y2
0.58
11.92
0.43
0.85
0.34
F
Y1
0.62
11.16
0.49
0.78
0.39
Y2
0.65
9.49
0.53
0.78
0.42
Al-Bitar et al.16
Jordan
M
Y1
0.57
11.80
0.43
0.88
0.33
Y2
0.65
9.32
0.53
0.87
0.42
F
Y1
0.61
11.25
0.44
0.75
0.38
Y2
0.68
9.22
0.50
0.72
0.47
Arslan et al.3
Turkey
M
Y1
0.79
9.98
0.50
0.72
0.62
Y2
0.74
9.54
0.50
0.78
0.54
F
Y1
0.83
9.77
0.50
0.72
0.68
Y2
0.69
9.14
0.50
0.81
0.47
Pardede et al.35
Indonesia
M
Y1
0.67
10.51
0.54
0.87
0.45
Y2
0.71
8.03
0.60
0.88
0.50
F
Y1
0.57
11.63
0.47
0.93
0.32
Y2
0.61
11.16
0.45
0.81
0.36
Present study
Western Australian
M
Y1
0.74
5.09
0.72
0.88
0.54
Y2
0.69
6.34
0.66
0.92
0.47
F
Y1
0.58
7.44
0.62
1.04
0.34
Y2
0.62
5.59
0.63
0.96
0.39
A prediction model for the estimation of mesiodistal dimensions of canines and premolars for Australian population adolescents.
Male
Female
Mandibular Incisors
Max-CPM (Y1)
Man-CPM (Y2)
Max-CPM (Y1 )
Man-CPM (Y2)
19.0
18.87
18.84
19.22
17.66
19.5
19.23
19.17
19.53
17.97
20.0
19.59
19.50
19.84
18.29
20.5
19.95
19.83
20.15
18.61
21.0
20.32
20.16
20.46
18.93
21.5
20.68
20.49
20.77
19.24
22.0
21.04
20.82
21.08
19.56
22.5
21.40
21.15
21.39
19.88
23.0
21.77
21.47
21.70
20.20
23.5
22.13
21.80
22.01
20.51
24.0
22.49
22.13
22.32
20.83
24.5
22.85
22.46
22.63
21.15
25.0
23.22
22.79
22.94
21.47
25.5
23.58
23.12
23.25
21.78
26.0
23.94
23.45
23.56
22.10
26.5
24.30
23.78
23.87
22.42
27.0
24.67
24.11
24.18
22.74
27.5
25.03
24.44
24.49
23.05
28.0
25.39
24.76
24.80
23.37
28.5
25.75
25.09
25.11
23.69
29.0
26.12
25.42
25.42
24.01
Comparison of mean study parameters of group of teeth in each gender using independent sample t test.