Page 46 - 南京医科大学自然版

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A B D
Sagittal view Axial view 12 000 HU=2 031+10.61×ρ 500 *** *** *** *** ***
2
1 mm 1 mm R =0.998 1 （μm） 400
9 000 P < 0.001
0 d 300
HU 6 000 Tooth movement 200
3 d 3 000 100 0

0
0 200 400 600 800 0 3 7 14 21 28
3
7 d Density（mg/cm ） Time（d）
A C E
Posterior palatine foramen
d Palatal plane
14 M2 z M1 M2 1 mm
z
M1
d O C1 C2
21 y
x D
x
O
d
28
y
A：Sagittal and axial views of 3D reconstruction of orthodontic tooth movement at various time points（scale bar=1 mm）. B：Linear fit curve of densi⁃
ty⁃CT value relationship. C：Schematic diagram of centroid distance measurement：M1 represents the first molar，M2 represents the second molar，C1 is
the centroid of the first molar，C2 is the centroid of the second molar，and vector D  is the directed line segment from C2 to C1. D：Trend of tooth move⁃
***
ment distance change， P < 0.001（n=5）.
图3 牙齿移动距离的变化趋势
Figure 3 Trends in orthodontic tooth movement
A Sagittal view Axial view
M1
M1
M2

p
p
t t
1 mm 1 mm

B

Pore Section at the
ROI 3D
reconstruction
coloring midpoint
0 d 3 d 7 d 14 d 21 d 28 d

ROI⁃p

ROI⁃t

A：Sagittal and axial CT sections. ROI⁃p represents the pressure zone，ROI⁃t represents the tension zone，M1 is the first molar，and M2 is the sec⁃
ond molar（scale bar=1 mm）. B：3D reconstruction of ROIs in tension and pressure zones. Blue regions indicate pore areas，while gray regions indicate
bone tissue areas.
图4 ROI三维重建截面图
Figure 4 3D reconstructed cross⁃sectional image of ROI