Figure 1.

(a) The schematic drawing of the region-of-interest (ROI). The ROI was defined as an area within threads engaged in the upper cortical bone (red dot box); (b) microcomputed tomography (micro-CT) images for the measurement of the bone-to-implant contact ratio (BIC); (c) the bone-to-implant contact ratio (BIC) was calculated by the length of the green line divided by the total length of the well (green and red line); (d) the definition of the bone area (BA) was calculated by the area of red color divided by the total area of the well.