There were significant differences in both area and per area between two groups (P<0.05).

两组的牙本质小管面积和相对面积有显著性差异（P<0.05）。

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There were significant differences in big activity sport, fine sport, individual communication area(P<0.01).

各能区发育以大运动、精细运动、个人交往能区发育商差异显著，P<0.01。

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There were significant differences in big activity sport, fine sport, individual communication area(P<0.01).

各能区发育以大运动、精细运动、个人交往能区发育商差异显著，P<0.01。

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