Evaluating the Effect of Active Charcoal-Containing Toothpaste on Color Change, Microhardness, and Surface Roughness of Tooth Enamel and Resin Composite Restorative Materials

Table 4

Mean, standard deviation (SD), minimum and maximum of microhardness values after using the toothpastes.

Variables	Specimens	Toothpastes	Mean ± SD	Min	Max	P value
Microhardness	Enamel; N = 18	Charcoal free; (Colgate® Max Fresh)	12.45 ± 51.67	−96.3	105.7	0.04^‡
		Charcoal; (Colgate® MAX WHITE)	49.04 ± 53.19	−77.3	138.3
	Composite; N = 18	Charcoal free; (Colgate® Max Fresh)	−3.71 ± 3.99	−8.9	7.4	0.23^‡
		Charcoal; (Colgate® MAX WHITE)	−1.3 ± 7.52	−20.9	10.5

Statistically significant at . ^‡Independent sample t-test.