Effects of Two Different Acid Etching and Surface Washing Methods on Bond Strength on Different CAD-CAM Blocks under Aging Protocols

Table 4

Mean and multiple comparison of TS and TL difference values in terms of block and surface treatment.

	IPS e.max CAD	Celtra Duo
	HF + W	8.23±.42^A,a	7.26±.41^B,a
HF + PA	7.12±.25^A,b	6.79±.33^B,a
HF + US	6.35±.33^A,c	5.96±.25^B,c
MEP + W	8.45±.17^A,a	7.76±.28^B,a
MEP + PA	7.21±.53^A,b	6.94±.58^A,a
MEP + US	6.67±.21^A,b,c	6.20±.34^B,c

While lower case letters indicate the differences within the surface treatments, upper case letters indicate the comparison of each surface treatment (of the same type) in terms of blocks ().