4.

边缘骨高度变化对比

Comparison of marginal bone height between the two groups (mm, Mean±SD)

Group	Time	Middle incisor	Lateral incisor	Incisor
*P < 0.05 vs control group.
Control	Pre-treatment	1.2±0.3	1.2±0.4	1.0±0.4
	After treatment	1.5±0.5	1.4±0.3	1.5±0.4
Study	Pre-treatment	1.1±0.4*	1.3±0.5*	1.1±0.5*
	After treatment	1.9±0.7*	1.8±0.6*	1.8±0.5*