表3.

四环素牙组和正常牙组间不同干预措施所得统计学结果

Statistical results of different interventions between the tetracycline teeth group and the normal teeth group

Shade/group	Thickness				Transparency			Cements				Opacity coating
	0.8 mm	1.0 mm	1.2 mm		High	Low		Transparent	Yellow	Opaque		Yes	No
Lightness	P=0.012				P=0.630			P=0.001				P=0.001
Chroma	P=0.132				P=0.067			P=0.022				P=0.001