The positive rate of lower incisal margin was 7.%, .9% and .% respectively( P >0.0).
The positive rate of lower incisal margin was 7.%, .9% and .% respectively( P >0.0).
下切缘阳性率分别为 7. %、 .9%和 .% (P >0 .0 ) ;
The positive rate of lower incisal margin was 7.%, .9% and .% respectively( P >0.0).
下切缘阳性率分别为 7. %、 .9%和 .% (P >0 .0 ) ;