Surface roughness and characteristics of CAD/CAM zirconia and glass ceramics after combined treatment procedures

BMC Oral Health

Table 2 Surface roughness values (Ra) of various surface treated all-ceramics

Group	Treatment protocol	Material	Mean(SD) Ra (μm)		p*
Group	Treatment protocol	Material	Before treatment	After treatment	p*
Group A (n = 20)	HF + AP	Zirconium oxide	0.2(0.09)^a	0.6(0.01)^b	< 0.05
Group A (n = 20)	HF + AP	Lithium disilicate	0.3(0.05)^a	0.8(0.07)^c	< 0.05
Group B (n = 20)	Er:YAG + AP	Zirconium oxide	0.2(0.05)^a	0.50(0.07)^a	> 0.05
Group B (n = 20)	Er:YAG + AP	Lithium disilicate	0.36(0.09)^a	0.4(0.09)^a	> 0.05
Group C (n = 20)	Er:YAG + HF	Zirconium oxide	0.2(0.07)^a	0.35(0.07)^a	> 0.05
Group C (n = 20)	Er:YAG + HF	Lithium disilicate	0.23(0.09)^a	0.55(0.13)^a	> 0.05

*Wilcoxon signed ranks test (p < 0.05)
Within any column and line means with the same superscript letters are not significantly different (p > 0.05). Different letters indicate a significantly difference among the groups (p < 0.05)
HF hydrofluoric acid etching, AP airborne particle abrasion, Er:YAG erbium:yttrium aluminum garnet laser treatment

ISSN: 1472-6831