We know the pressure is equal to force per area.
我们知道压强等于力除以面积。
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）。
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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