Table 2 Mineral densities (g/cm³) in the range of 0–0.1 mm and 0.1–0.2 mm; initial (MD₁), after demineralization (MD₂) and after remineralization (MD₃)

0–0.1 mm

Group 1

 Subgroup 1a

2.329 ± 0.184^a

1.765 ± 0.232^ab

1.843 ± 0.155^b

0.08 ± 0.10

 Subgroup 1b

2.266 ± 0.090^a

1.788 ± 0.145^b

1.926 ± 0.053^b

0.14 ± 0.13

 Subgroup 1c

2.282 ± 0.165^a

1.741 ± 0.172^b

1.759 ± 0.171^b

0.02 ± 0.02

 *p

0.793

0.917

0.177

0.186

Group 2

 Subgroup 2a

2.373 ± 0.085^a

1.635 ± 0.207^b

1.893 ± 0.266^b

0.26 ± 0.19

 Subgroup 2b

2.315 ± 0.070^a

1.572 ± 0.251^b

1.919 ± 0.172^b

0.34 ± 0.30

 Subgroup 2c

2.018 ± 0.209

1.633 ± 0.139

1.660 ± 0.139

0.03 ± 0.03

 *p

0.777

0.877

0.144

0.078

Group 3

 Subgroup 3a

2.016 ± 0.148^a

1.590 ± 0.138^b

1.713 ± 0.075^b

0.12 ± 0.11

 Subgroup 3b

2.070 ± 0.128^a

1.685 ± 0.113^b

1.757 ± 0.132^ab

0.07 ± 0.08

 Subgroup 3c

2.289 ± 0.181^a

1.669 ± 0.157^b

1.875 ± 0.107^ab

0.21 ± 0.22

 *p

0.104

0.539

0.082

0.409

0.1–0.2 mm

Group 1

 Subgroup 1a

2.478 ± 0.229

2.378 ± 0.199

2.414 ± 0.205

0.04 ± 0.03

 Subgroup 1b

2.450 ± 0.125^a

2.331 ± 0.125^b

2.393 ± 0.113^a

0.06 ± 0.03

 Subgroup 1c

2.453 ± 0.148^a

2.241 ± 0.145^b

2.286 ± 0.119^c

0.04 ± 0.04

 *p

0.964

0.398

0.403

0.498

Group 2

 Subgroup 2a

2.556 ± 0.109^a

2.395 ± 0.079^b

2.435 ± 0.091^c

0.04 ± 0.02

 Subgroup 2b

2.516 ± 0.042^a

2.237 ± 0.084^b

2.340 ± 0.108^a

0.10 ± 0.04

 Subgroup 2c

2.219 ± 0.192

1.980 ± 0.219

2.149 ± 0.169

0.17 ± 0.18

 *p

0.881

0.233

0.490

0.188

Group 3

 Subgroup 3a

2.235 ± 0.199

2.111 ± 0.119

2.167 ± 0.134

0.06 ± 0.05

 Subgroup 3b

2.332 ± 0.400

2.077 ± 0.215

2,234 ± 0.321

0.16 ± 0.22

Subgroup 3c

2.546 ± 0.152

2.238 ± 0.147

2.411 ± 0.141

0.17 ± 0.18

  *p

0.211

0.310

0.218

0.513