Table 6.

Mean gingival recession or hyperplasia values, when grouping the teeth as frontal, premolars and molars, and depending on the specific retraction methods used.

			Number	Mean (mm)	Standard Deviation	F	p
Frontal teeth	Values first week after the retraction	Retraction cord, impregnated with a 5% aluminum chloride solution	21	−0.193	0.237
		Expasyl—retraction paste, containing kaolin and 15% aluminum chloride	20	0.109	0.115
		Astringent Paste—retraction paste, containing 15% aluminum chloride	22	0.080	0.048	25.689	0.000
		Ceramic bur rotary curettage	22	−0.361	0.254
		Er:YAG laser	22	−0.075	0.072
		Diode laser	21	−0.087	0.105
		Total	128	−0.090	0.224
	Values second week after the retraction	Retraction cord, impregnated with a 5% aluminum chloride solution	21	−0.168	0.215
		Expasyl—retraction paste, containing kaolin and 15% aluminum chloride	20	0.063	0.069
		Astringent Paste—retraction paste, containing 15% aluminum chloride	22	0.015	0.011	12.099	0.000
		Ceramic bur rotary curettage	22	−0.235	0.170
		Er:YAG laser	22	−0.057	0.101
		Diode laser	21	−0.072	0.201
		Total	128	−0.077	0.176
Premolars	Values first week after the retraction	Retraction cord, impregnated with a 5% aluminum chloride solution	11	−0.123	0.130
		Expasyl—retraction paste, containing kaolin and 15% aluminum chloride	12	0.138	0.127
		Astringent Paste—retraction paste, containing 15% aluminum chloride	10	0.060	0.041	17.774	0.000
		Ceramic bur rotary curettage	11	−0.561	0.317
		Er:YAG laser	12	−0.132	0.207
		Diode laser	13	−0.170	0.202
		Total	69	−0.131	0.287
	Values second week after the retraction	Retraction cord, impregnated with a 5% aluminum chloride solution	11	−0.090	0.106
		Expasyl—retraction paste, containing kaolin and 15% aluminum chloride	12	0.058	0.052
		Astringent Paste—retraction paste, containing 15% aluminum chloride	10	0.015	0.014	12.495	0.000
		Ceramic bur rotary curettage	11	−0.410	0.289
		Er:YAG laser	12	−0.064	0.124
		Diode laser	13	−0.125	0.179
		Total	69	−0.102	0.212
Molars	Values first week after the retraction	Retraction cord, impregnated with a 5% aluminum chloride solution	10	−0.081	0.055
		Expasyl—retraction paste, containing kaolin and 15% aluminum chloride	11	0.103	0.084
		Astringent Paste—retraction paste, containing 15% aluminum chloride	10	0.024	0.027	26.708	0.000
		Ceramic bur rotary curettage	12	−0.507	0.208
		Er:YAG laser	11	−0.114	0.097
		Diode laser	12	−0.187	0.213
		Total	66	−0.137	0.241
	Values second week after the retraction	Retraction cord, impregnated with a 5% aluminum chloride solution	10	−0.069	0.056
		Expasyl—retraction paste, containing kaolin and 15% aluminum chloride	11	0.047	0.039
		Astringent Paste—retraction paste, containing 15% aluminum chloride	10	0.005	0.013	14.546	0.000
		Ceramic bur rotary curettage	12	−0.343	0.230
		Er:YAG laser	11	−0.057	0.048
		Diode laser	12	−0.119	0.151
		Total	66	−0.095	0.175