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Micro-computed tomography images of interdental distance between first and second molar teeth of the (A) control, (B) NaHS, (C) PAG and (D) PAG+NaHS groups, and (E) quantification of the changes in the molar tooth movement. Data are presented as the mean ± standard deviation. **P<0.01. OTM, orthodontic tooth movement; NaHS, sodium hydrosulfide; PAG, propargylglycine.
