Table 2 Microhardness values (mean ± SD) of the enamel and dentin of primary teeth

 Control

416.71 ± 20.52

376.71 ± 19.16

343.29 ± 18.73

378.91 ± 19.19

63.31 ± 8.50

80.46 ± 9.40

71.70 ± 10.99

71.82 ± 9.59

 10Gy

397.14 ± 23.79

343.43 ± 24.78*

303.43 ± 28.51

348.00 ± 25.27

56.24 ± 5.39

74.83 ± 11.55

70.16 ± 6.90

67.08 ± 7.85

 20Gy

411.00 ± 21.35

355.71 ± 22.38

336.71 ± 19.75

367.81 ± 20.72

63.99 ± 7.67

71.76 ± 12.21

80.43 ± 5.03

72.06 ± 8.180

 30Gy

399.43 ± 28.43

362.71 ± 14.60

312.00 ± 31.60

358.05 ± 24.46

57.14 ± 5.35

67.49 ± 7.01

65.64 ± 9.11

63.42 ± 7.03

 40Gy

429.14 ± 15.28

388.71 ± 18.94

340.43 ± 33.12

386.10 ± 21.74

67.80 ± 11.26

81.31 ± 11.17

77.36 ± 9.23

75.49 ± 10.33

 50Gy

426.29 ± 31.72

376.29 ± 19.57

354.29 ± 17.08

385.62 ± 22.56

62.96 ± 7.91

74.50 ± 9.56

69.84 ± 11.19

69.10 ± 9.50

 60Gy

411.14 ± 24.96

367.71 ± 9.83

343.57 ± 11.33

374.14 ± 15.16

58.13 ± 4.49

78.46 ± 5.47

66.07 ± 10.97

67.76 ± 6.83

**p-value

0.128

0.002

0.002

0.014

0.058

0.122

0.040

0.200

 Control

342.70 ± 30.20

294.63 ± 37.57

235.61 ± 15.47

290.98 ± 27.63

34.26 ± 7.36

48.31 ± 5.22

39.17 ± 7.27

40.58 ± 6.58

 10Gy

295.40 ± 28.41

296.04 ± 28.88

265.60 ± 22.50

285.68 ± 25.95

36.36 ± 7.65

49.36 ± 8.96

45.17 ± 8.93

43.63 ± 8.41

 20Gy

290.00 ± 34.55*

269.93 ± 37.75

232.14 ± 30.70

264.02 ± 33.86

30.94 ± 9.89

49.04 ± 10.03

40.00 ± 6.63

40.00 ± 8.64

 30Gy

393.77 ± 34.85

324.68 ± 35.90

265.03 ± 29.38

327.83 ± 31.58

25.07 ± 1.03

38.51 ± 8.64

34.44 ± 9.91

32.68 ± 6.21

40Gy

399.97 ± 34.01*

366.11 ± 37.41*

302.17 ± 28.80*

356.09 ± 32.29*

33.24 ± 7.09

37.64 ± 8.61

36.64 ± 8.98

35.84 ± 8.13

 50Gy

304.81 ± 25.49

237.79 ± 22.11*

233.68 ± 36.33

258.76 ± 26.39

35.47 ± 8.08

56.71 ± 4.81

48.19 ± 6.40

46.79 ± 6.31

 60Gy

268.33 ± 30.46*

226.43 ± 7.15*

173.20 ± 17.68*

222.65 ± 17.76*

27.71 ± 6.52

46.14 ± 10.82

35.64 ± 6.68

36.50 ± 7.84

**p-value

< 0.001

< 0.001

< 0.001

< 0.001

0.050

0.002

0.019

0.018