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The width of the mid-palatal suture (A) and bone volume of ROI (B) in the three groups on days 3, 7, 14. *P<0.05, significant increase versus the C group. #P<0.05, significant increase versus the EP group. Data represent the mean ± SD of five rats for each group. C, control group; EP, expansion group; ES, expansion plus simvastatin group.
