Enamel Microcracks Induced by Simulated Occlusal Wear in Mature, Immature, and Deciduous Teeth
Table 1
The results obtained from the analysis of the microcrack parameters in each specimen. The total length of microcracks, count/number of microcracks, and depth of microcracks in the surfaces and subsurfaces of the study groups.
Parameter
Groups
p value
Mature
Immature
Deciduous
Number of surface microcracks
Median
4
7
9
Range
5
10
7
Maximum
7
13
13
Minimum
2
3
6
a
b
b
≤0.001
Total length of surface microcracks (mm)
Median
5.64
10.80
16.06
Range
10.44
15.89
17.25
Maximum
11.37
18.17
25.13
Minimum
0.93
2.28
7.88
Rank
a
b
b
≤0.001
Number of subsurface microcracks
Median
2
3
6
Range
7
6
5
Maximum
7
6
9
Minimum
0
0
4
Rank
a
a
b
≤0.001
Total length of subsurface microcracks (mm)
Median
2.69
3.77
12.15
Range
6.20
9.90
24.98
Maximum
6.20
9.90
29.94
Minimum
0.00
0.00
4.96
Rank
a
a
b
≤0.001
Depth of microcracks near wear area (µm)
Median
4.37
4.38
14.99
Range
17.04
25.68
24.43
Maximum
17.98
26.49
28.42
Minimum
0.94
0.81
3.99
Rank
a
a
b
Depth of microcracks far from wear area (µm)
Median
2.34
2.76
2.88
Range
14.33
15.01
5.12
Maximum
14.85
15.25
7.62
Minimum
0.52
0.24
2.50
Rank
a
a
a
0.711 NS
indicates a statistically significant difference. lowercase letters in the columns indicate statistically significant intergroup differences in the same characteristics in rows. depth of surface microcracks shows the deepest microcrack measurement in relation to the position of the wear area.
