Group Change in weight (%) Absorbance
After/before surface treatment After/before SBF treatment
Mean (SD) Mean (SD) Mean (SD)
Control -0.1 (0.14)a 0.8 (0.2)d 0.037 (0.001)g
Acid -5.2 (0.53)b 1.2 (0.2)e 0.038 (0.001)h
Alkali 0.4 (0.15)c 1.6 (0.1)f 0.041 (0.001)i

a-b,b-c,d-e,d-f,e-f,g-i,h-iStatistically significant at P < 0.05, Tukey's post hoc test.
a-c,g-hNot statistically significant at P < 0.05, Tukey's post hoc test.
SD = standard deviation.