2026 年 35 巻 3 号 p. 123-130
The objective of this study was to quantitatively evaluate the impact of surface treatment on the surrounding bone when subjected to horizontal orthopedic force on the anchor screw with surface treatment by performing structural analysis of the surrounding bone. Hydrophilicity was imparted as the surface treatment to the anchor screw. Samples were collected 3, 5, 7, 14, and 28 days later for bone morphometry and histological evaluation. As a result of applying orthopedic force, the surrounding bone of the surface-treated anchor screw maintained a bone contact rate similar to that under normal load. In the untreated group, bones detached from the screw, showing a significantly lower bone contact rate compared to normal load conditions. The surface-treated group, even under orthopedic force conditions, exhibited a bone contact similar to that under normal load. The long diameter /short diameter of bone lacunae showed significantly lower values in the region subjected to compressive stress. These results suggested that anchor screws without surface treatment can withstand normal horizontal loads but may not endure orthopedic force, leading to early bone detachment and surrounding bone absorption. By achieving good primary stability, surface-treated anchor screws, demonstrated the potential to withstand immediate horizontal orthopedic force.
