. 2013 Jun 7;5(2):103–110. doi: 10.1038/ijos.2013.31

Table 4. Enamel mineral content values of different groups.

Depth from surface/μm	Volume percentage of mineral/%
Depth from surface/μm	DDW	BG	HP	BG before HP	BG after HP	BG during HP
25	94.01 (1.24)^aA	94.65 (1.16)^aA	86.32 (1.24)^bA	89.89 (1.06)^cA	89.27 (0.61)^cA	91.03 (1.29)^dA
50	95.25 (1.35)^aA	94.24 (1.72)^aA	87.64 (1.89)^bA	90.58 (1.41)^cB	90.21 (1.03)^cA	92.96 (0.76)^dB
75	94.89 (1.14)^aA	95.38 (1.55)^aA	90.20 (1.31)^bB	92.81 (0.85)^cC	92.51 (1.01)^cB	95.01 (0.86)^aC
100	95.51 (1.42)^aA	95.14 (1.57)^aA	92.87 (0.82)^bC	94.89 (1.00)^aD	93.49 (1.34)^bC	94.85 (1.08)^aC
150	94.89 (0.84)^aA	95.20 (1.90)^aA	95.05 (1.45)^aD	95.65 (1.24)^aD	95.22 (1.31)^aD	95.40 (1.14)^aC
200	94.99 (1.16)^aA	95.81 (2.12)^aA	95.04 (1.32)^aD	94.76 (1.46)^aD	94.60 (2.04)^aD	95.37 (1.86)^aC

BG, bioglass; DDW, distilled deionized water; HP, hydrogen peroxide; SMH, surface microhardness.

Different lower (a-d) and upper (A-D) case letters indicate statistically significant differences (P<0.05) for inter-group and intra-group comparison, respectively.