Table 5.

Optical density of Dkk1 in the bone cells in the third inflammatory area of alveolar crest ($\overline{X}$ ± SD).

Time (wk)	Optical density of positive cells
	N	P
2	0.10 ± 0.01	0.13 ± 0.03*
4	0.11 ± 0.03	0.18 ± 0.04*,**
6	0.13 ± 0.02	0.21 ± 0.07*,**

*Compared with group N, significantly different, P < 0.05.

**Compared with the data in the 2^nd week of modeling, significantly different, P < 0.05.

SD = standard deviation.