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Table 1 Mean and Standard Deviation of recorded acoustic impedance values for each region and irradiation dose obtained by 320 MHz Scanning Acoustic Microscopy (SAM). The statistically significant irradiated groups were marked with the asterisk a

From: Acoustic diagnosis of elastic properties of human tooth by 320 MHz scanning acoustic microscopy after radiotherapy treatment for head and neck cancer

DoseAcoustic Impedance Z (MRayl)
EnamelP valueDentinP value
Pre-irradiationPost-irradiationPre-irradiationPost-irradiation
2 Gy (n = 9)12.94 ± 0.6712.65 ± 0.43>.99997.94 ± 0.697.42 ± 0.35> 0.9999
8 Gy (n = 9)11.88 ± 0.35.55947.39 ± 0.27> 0.9999
20 Gy (n = 9)11.37 ± 0.63.06326.52 ± 0.43 a0.0296
30 Gy (n = 9)7.24 ± 0.18 a.00025.71 ± 0.66 a0.0006
60 Gy (n = 9)6.49 ± 0.28 a<.00014.82 ± 0.53 a< 0.0001
  1. aSignificant difference