230310.fig.004a
(a)
230310.fig.004b
(b)
230310.fig.004c
(c)
Figure 4: Histologic evaluation showed that at (a) 1 week, initial woven bone formation occurred in the regions between threads and in direct contact with the implant surface (arrows). (b) At three weeks, an increase in the amounts of bone between threads was evident, and the (c) onset of replacement of woven bone by lamellar bone was observed for all groups evaluated at 5 weeks (arrows).