There was statistically significant in the average distal movement of the upper first molar (.7 mm,P≤0.0)and the average mesial movement of the lower first molar (. m,P≤0.00).
There was statistically significant in the average distal movement of the upper first molar (.7 mm,P≤0.0)and the average mesial movement of the lower first molar (. m,P≤0.00).
上颌第一磨牙平均远中移动.7mm(P≤0.0),下颌第一磨牙平均 近中移动.mm(P≤0.00)。