Table 2 Distribution and comparison of microhardness measurements according to groups

Mean ± S.D. (Median)

Mean ± S.D. (Median)

Mean ± S.D. (Median)

Test Statistic

p

EF45

40.18 ± 10.67 (39.8)

37.85 ± 10.41 (36.86)

31.08 ± 7.88 (30.7)

18.740

0.010*

EF90

38.34 ± 8.22 (40.6)

34.33 ± 10.21 (38.58)

28.3 ± 8.14 (24.9)

5.997

0.063

EM45

37.68 ± 13.74 (30.4)

35.64 ± 14.33 (32.17)

34.7 ± 11.16 (29.8)

2.227

0.170

EM90

38.02 ± 7.43 (39)

36.29 ± 7.25 (38.44)

35.95 ± 7.81 (37.42)

9.779

0.007*

Test Statistic/p

Test Statistic/p

Test Statistic/p

EF45-EM45

0.321/0.756

0.280/0.787

− 0.593/0.570

EF90-EM90

0.065/0.950

− 0.350/0.735

− 1.515/0.168

EF45-EF90

0.306/0.768

0.540/0.604

0.549/0.598

EM45-EM90

− 0.049/0.962

− 0.091/0.930

− 0.205/0.843

Mean ± S.D. (Median)

Mean ± S.D. (Median)

Mean ± S.D.(Median)

Test Statistic

p

SF45

35.08 ± 7.62 (32.4)

28.02 ± 6.83 (23.32)

25.86 ± 5.84 (22.67)

25.893

 < 0.001*

SF90

37.3 ± 3.8 (36.7)

25.65 ± 7.1 (22.12)

21.61 ± 3.38 (21.52)

18.255

0.001*

SM45

39.48 ± 13.66 (35.4)

31.52 ± 9.17 (32.05)

27.07 ± 6.09 (27.54)

7.801

0.050

SM90

34.18 ± 5.16 (32.87)

26.6 ± 6.82 (25.76)

23.78 ± 4.44 (21.32)

14.696

0.002*

Test Statistic/p

Test Statistic/p

Test Statistic/p

SF45-SM45

− 0.629/0.547

− 0.686/0.512

− 0.320/0.757

SF90-SM90

1.088/0.308

− 0.216/0.835

− 0.868/0.411

SF45-SF90

− 0.583/0.576

− 0.538/0.605

1.407/0.197

SM45-SM90

0.812/0.453

0.964/0.365

0.976/0.358

Mean ± S.D. (Median)

Mean ± S.D. (Median)

Mean ± S.D. (Median)

Test Statistic

p

GF45

40.01 ± 12.47 (37.3)

33.55 ± 8.76 (32.26)

28.95 ± 4.65 (29.1)

5.812

0.071

GF90

37.61 ± 4.68 (35.1)

31.10 ± 2.00 (30.9)

23.35 ± 6.82 (26.98)

12.163

0.006*

GM45

37.11 ± 5.41 (35)

35.21 ± 6.24 (35.3)

31.77 ± 6.45 (29.2)

5.200**

0.074

GM90

36.43 ± 4.11 (35.89)

32.97 ± 1.33 (33.6)

26.42 ± 7.76 (30.65)

4.934

0.084

Test Statistic/p

Test Statistic/p

Test Statistic/p

GF45-GM45

0.477/0.646

− 0.346/0.739

− 0.419†/0.690

GF90-GM90

0.423/0.683

− 1.740/0.120

− 0.666/0.126

GF45-GF90

0.404/0.697

0.608/0.560

1.519/0.167

GM45-GM90

0.224/0.829

0.784/0.456

− 0.104†/1.000

Between the Powders

Test Statistic/p

Test Statistic/p

Test Statistic/p

F45

0.385/0.689

1.574/0.247

0.876/0.441

F90

0.041/0.960

1.821/0.204

1.454/0.272

M45

0.060/0.942

0.234/0.795

0.967‡/0.617

M90

0.565/0.583

3.614/0.059

4.357/0.038*