An In Situ Evaluation of the Protective Effect of Nano Eggshell/Titanium Dioxide against Erosive Acids

Table 2

Mean surface roughness, standard deviation, standard error, and ANOVA.

Groups	N	Mean ± SD	Std. error	95% confidence interval for mean			Post hoc bonferroni test
				Lower bound	Upper bound
Unexposed tooth	4	32.6 ± 16.3 nm	8.1	6.7077	58.5478	0.021	0.02^1,2
Exposed tooth + HCI	4	101.9 ± 18.0 nm	9.0	73.1958	130.5232		0.295^1,5
Exposed tooth + HCI + Colgate	4	65.2 ± 29.0 nm	14.5	19.0787	111.4123		0.992^1,3
Exposed tooth + HCI + Senosdyne	4	83.1 ± 33.7 nm	16.8	29.4663	136.6767		0.159^1,4
Exposed tooth + EB@TiO2	4	57.2 ± 29.6 nm	14.8	10.0747	104.3583		1.00^1,5

Superscript numbers indicate significant differences between the sample groups (ANOVA, ).