Mechanical and Histological Effects of Resorbable Blasting Media Surface Treatment on the Initial Stability of Orthodontic Mini-Implants

Figure 6

Histological specimens from the machined group (a, c, e, and g) and resorbable blasting media (RBM) group (b, d, f, and h). Microscopic views of hematoxylin-eosin-stained sections are observed from (a) to (d), and fluorescence microscopic views are observed from (e) through (h). (a) In the machined group, a large area of new bone formation (white arrows) surrounds the resorbed old bone (black arrows; ×4). (b) In the RBM group, there is a large area of intact old lamellar bone (black arrows) and little new bone formation (white arrows; ×4). (c) A magnified view of the white box in (a). New bone (white arrows) occupies the area of the resorbed old bone (black arrow; ×10). (d) A magnified view of the white box in (b). Old lamellar bone (black arrow) is resorbed with a thin surface margin and little new bone formation (white arrow; ×10). (e) Fluorescence bone labeling image of (a). Green color (calcein, white arrows) is widely observed at the bone-mini-implant interface (×4). (f) Fluorescence bone labeling image of (b). There is a small green-colored area (calcein, white arrows; ×4). (g) A magnified view of the white box in (e). A green-colored area (calcein, upper white arrow) which was formed at 2 weeks after mini-implant insertion is observed beside old bone (left black arrow). The other new bone (lower white arrow) which was formed after 2 weeks is observed between upper white arrow and left black arrow. There are scattered large green color areas. (h) A magnified view of the white box in (f). Thin green lines can be observed (calcein, lower white arrow) around remaining old bone (left black arrow). There is an area which was formed after 2 weeks between green line (lower white arrow) and resorbed area (right black arrow). The new formed bone is smaller than new bone of (g).

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