The U test was used to compare mean angular values between the 2 groups.Spearman correlation coefficients were calculated to assess the relationship with age.

• 结果上颌第三磨牙萌出组与未萌出组相比，上颌第一磨牙和第二磨牙更向近中倾斜，而且随年龄的增加倾斜度也变大。