02.05.2018 | Original Article | Ausgabe 3/2018 Open Access

Aspartic acid racemization of root dentin used for dental age estimation in a Polish population sample
- Zeitschrift:
- Forensic Science, Medicine and Pathology > Ausgabe 3/2018
Introduction
Materials and methods
Results
Metrical age (in years)
|
Tooth group
|
|||
---|---|---|---|---|
Central incisors (Group 1)
|
Lateral incisors (Group 2)
|
Canines (Group 3)
|
First premolars (Group 4)
|
|
Number of samples
|
21
|
14
|
15
|
14
|
Minimal age
|
30.00
|
30.00
|
34.00
|
20.00
|
Maximal age
|
68.00
|
68.00
|
68.00
|
68.00
|
Median
|
50.00
|
48.00
|
50.00
|
43.50
|
Arithmetic mean
|
48.33
|
47.71
|
51.33
|
47.71
|
Standard deviation
|
14.72
|
14.68
|
13.33
|
16.29
|
Skewness coefficient
|
0.12
|
0.08
|
−0.03
|
0.02
|
Statistical analysis
|
Kruskal-Wallis test: H = 1.031
p = 0.793
|
Sample number/ Tooth number
|
D
|
L
|
D/L
|
ln
|
Metrical age (in years)
|
Estimated age (in years)
|
± error (in years)
|
---|---|---|---|---|---|---|---|
11/31
|
2,4
|
97,6
|
0,0246
|
0,0492
|
34
|
35
|
1
|
13/41
|
2,4
|
97,6
|
0,0246
|
0,0492
|
34
|
35
|
1
|
23/41
|
3,1
|
96,9
|
0,0320
|
0,0640
|
50
|
49
|
1
|
25/31
|
3,0
|
97,0
|
0,0309
|
0,0619
|
50
|
47
|
3
|
36/41
|
4,0
|
96,0
|
0,0418
|
0,0836
|
68
|
68
|
0
|
38/31
|
4,1
|
95,9
|
0,0428
|
0,0856
|
68
|
70
|
2
|
52/41
|
2,5
|
97,5
|
0,0256
|
0,0513
|
39
|
37
|
2
|
54/31
|
2,5
|
97,5
|
0,0256
|
0,0513
|
39
|
37
|
2
|
64/31
|
2,3
|
97,7
|
0,0231
|
0,0463
|
30
|
32
|
2
|
66/41
|
2,3
|
97,7
|
0,0236
|
0,0473
|
30
|
33
|
3
|
80/31
|
2,6
|
97,4
|
0,0264
|
0,0528
|
38
|
38
|
0
|
82/41
|
2,7
|
97,3
|
0,0275
|
0,0551
|
38
|
40
|
2
|
94/31
|
3,7
|
96,4
|
0,0379
|
0,0758
|
63
|
60
|
3
|
106/31
|
4,0
|
96,0
|
0,0413
|
0,0827
|
68
|
67
|
1
|
108/41
|
3,9
|
96,2
|
0,0400
|
0,0801
|
68
|
64
|
4
|
120/41
|
2,3
|
97,7
|
0,0234
|
0,0469
|
31
|
33
|
2
|
123/31
|
2,2
|
97,8
|
0,0224
|
0,0448
|
31
|
31
|
0
|
130/41
|
3,3
|
96,7
|
0,0337
|
0,0674
|
56
|
52
|
4
|
132/31
|
3,9
|
96,1
|
0,0404
|
0,0808
|
56
|
65
|
9
|
146/31
|
3,8
|
96,2
|
0,0394
|
0,0788
|
62
|
63
|
1
|
148/41
|
3,7
|
96,3
|
0,0382
|
0,0764
|
62
|
61
|
1
|
Sample number/ Tooth number
|
D
|
L
|
D/L
|
ln
|
Metrical age (in years)
|
Estimated age (in years)
|
± error (in years)
|
---|---|---|---|---|---|---|---|
62/32
|
2,2
|
97,8
|
0,0222
|
0,0444
|
30
|
33
|
3
|
68/42
|
2,2
|
97,9
|
0,0220
|
0,0440
|
30
|
32
|
2
|
78/32
|
2,6
|
97,5
|
0,0262
|
0,0523
|
38
|
39
|
1
|
84/42
|
2,5
|
97,5
|
0,0261
|
0,0521
|
38
|
39
|
1
|
92/42
|
4,1
|
96,0
|
0,0422
|
0,0845
|
63
|
64
|
1
|
96/32
|
4,1
|
95,9
|
0,0426
|
0,0853
|
63
|
64
|
1
|
104/32
|
4,2
|
95,8
|
0,0440
|
0,0880
|
68
|
66
|
2
|
110/42
|
4,5
|
95,5
|
0,0473
|
0,0948
|
68
|
72
|
4
|
118/42
|
2,2
|
97,8
|
0,0221
|
0,0442
|
31
|
33
|
2
|
124/32
|
2,2
|
97,8
|
0,0225
|
0,0450
|
31
|
33
|
2
|
128/42
|
3,7
|
96,3
|
0,0387
|
0,0775
|
56
|
58
|
2
|
134/32
|
3,1
|
96,9
|
0,0316
|
0,0632
|
56
|
47
|
9
|
142/32
|
2,8
|
97,2
|
0,0290
|
0,0581
|
48
|
43
|
5
|
144/42
|
2,9
|
97,1
|
0,0302
|
0,0604
|
48
|
45
|
3
|
Sample number/ Tooth number
|
D
|
L
|
D/L
|
ln
|
Metrical age (in years)
|
Estimated age (in years)
|
± error (in years)
|
---|---|---|---|---|---|---|---|
7/33
|
2,3
|
97,7
|
0,0240
|
0,0479
|
34
|
34
|
0
|
17/43
|
2,4
|
97,6
|
0,0244
|
0,0488
|
34
|
34
|
0
|
19/43
|
3,0
|
97,0
|
0,0306
|
0,0612
|
50
|
46
|
4
|
29/33
|
3,1
|
96,9
|
0,0316
|
0,0632
|
50
|
48
|
2
|
42/33
|
3,7
|
96,3
|
0,0386
|
0,0773
|
68
|
61
|
7
|
48/43
|
2,8
|
97,2
|
0,0285
|
0,0570
|
39
|
42
|
3
|
58/33
|
2,9
|
97,1
|
0,0297
|
0,0593
|
39
|
44
|
5
|
86/43
|
2,5
|
97,5
|
0,0257
|
0,0515
|
38
|
37
|
1
|
76/33
|
2,6
|
97,4
|
0,0267
|
0,0534
|
38
|
39
|
1
|
90/43
|
3,9
|
96,1
|
0,0408
|
0,0816
|
63
|
66
|
3
|
98/33
|
3,8
|
96,2
|
0,0397
|
0,0795
|
63
|
63
|
0
|
102/33
|
4,1
|
95,9
|
0,0430
|
0,0860
|
68
|
70
|
2
|
112/43
|
4,2
|
95,8
|
0,0436
|
0,0873
|
68
|
71
|
3
|
152/33
|
3,4
|
96,6
|
0,0355
|
0,0711
|
59
|
56
|
3
|
154/43
|
3,6
|
96,4
|
0,0371
|
0,0743
|
59
|
59
|
0
|
Sample number/ Tooth number
|
D
|
L
|
D/L
|
ln
|
Metrical age (in years)
|
Estimated age (in years)
|
± error (in years)
|
---|---|---|---|---|---|---|---|
1/44
|
2,0
|
98,1
|
0,0199
|
0,0398
|
20
|
24
|
4
|
31/44
|
3,6
|
96,4
|
0,0378
|
0,0756
|
68
|
64
|
4
|
44/34
|
3,4
|
96,6
|
0,0353
|
0,0706
|
68
|
58
|
10
|
46/44
|
2,8
|
97,2
|
0,0286
|
0,0572
|
39
|
43
|
4
|
60/34
|
2,6
|
97,4
|
0,0271
|
0,0542
|
39
|
40
|
1
|
74/34
|
2,6
|
97,4
|
0,0268
|
0,0536
|
38
|
39
|
1
|
88/44
|
2,6
|
97,4
|
0,0266
|
0,0532
|
38
|
39
|
1
|
100/34
|
3,8
|
96,2
|
0,0396
|
0,0793
|
68
|
68
|
0
|
114/44
|
3,8
|
96,2
|
0,0397
|
0,0795
|
68
|
68
|
0
|
116/44
|
2,2
|
97,8
|
0,0226
|
0,0452
|
31
|
30
|
1
|
126/34
|
2,0
|
98,0
|
0,0203
|
0,0406
|
31
|
25
|
6
|
136/34
|
3,5
|
96,5
|
0,0365
|
0,0730
|
56
|
61
|
5
|
138/44
|
3,3
|
96,8
|
0,0336
|
0,0672
|
56
|
54
|
2
|
140/34
|
3,3
|
96,7
|
0,0343
|
0,0687
|
48
|
56
|
8
|
Metrical age relation to ln[(1 + D /L)/(1 – D /L)]
|
Linear regression analysis
|
---|---|
central incisors
|
Y = 963.541
X – 12.747
n = 21; R = 0.98; F = 479.516; s = 2.947
|
lateral incisors
|
Y = 772.191
X – 1.574
n = 14; R = 0.97; F = 207.98; s = 3.570
|
canines
|
Y = 943.497
X – 11.529
n = 15; R = 0.97; F = 230.65; s = 3.195
|
first premolars
|
Y = 1123.305
X – 21.107
n = 14; R = 0.96; F = 135.44; s = 4.838
|
Discussion
Retention time [min]
|
Surface area [mV.s]
|
Surface area [%]
|
|
---|---|---|---|
1.
|
20.170
|
2.159
|
50.0
|
2.
|
20.533
|
2.155
|
50.0
|
Total
|
4.313
|
100.0
|