4.

牙槽嵴保存后牙槽骨高度变化

Vertical dimensional changes after alveolar ridge preservation

Items		Baseline	6 months	Differences	P
MHplate, the distance between the alveolar ridge and reference at the mesial aspect; CHplate, the distance between the alveolar ridge and reference at the central aspect; DHplate, the distance between the alveolar ridge and reference at the distal aspect.
MHplate/mm, x±s	Flap group	4.47±3.18	3.80±1.38	0.67±2.39	0.875
	Flapless group	5.06±2.54	3.81±1.77	1.25±2.41	0.100
	P			0.561
CHplate/mm, x±s	Flap group	9.45±4.59	3.92±2.16	5.53±4.20	0.001
	Flapless group	11.86±4.39	4.17±2.26	7.70±4.35	0.000
	P			0.226
DHplate/mm, x±s	Flap group	5.35±3.45	3.07±1.84	2.28±2.46	0.008
	Flapless group	3.45±1.71	2.93±2.16	0.52±1.38	0.222
	P			0.044