Figure 1.
Intra-oral photos of the mini-screw implants.
A. The mini-screw implant was placed between the upper first molar and the second molar on the buccal side; B. The mini-screw implant was placed between the first molar and the second premolar on the palatal side.
Figure 2.
Reference plane for measurement.
A. Front view of reference plane; B. Skull base view of reference plane, and three points were identified to ensure the reference plane: a, midpoint of the left greater palatine foramen; b, midpoint of the right greater palatine foramen; c, the forefront of the nasal crest.
Figure 3.
A is the crown central fossa (the very low point of fossa).
Figure 4.
Segmentation of the upper first molar.
Figure 5.
Adjustment of first molar for 3D orientation.
Figure 6.
Construction of the reference plane.
The plane parallel to the cement-enamel junction and passing through the deepest point of the furcation between these roots.
Figure 7.
Isolation of the roots of first molar.
1 is the mesiobuccal root; 2 is the distobuccal root; 3 is the palatal root.
Table 1.
Comparison of root resorption after mini-screw intrusion (Mean±SD) (mm3).