The positive rate of upper incisal margin was .%,. % and . % respectively( P <0.0).
The positive rate of upper incisal margin was .%,. % and . % respectively( P <0.0).
上切缘阳性率分别为 . %、. %和 . % (P <0 .0 ) ;
The positive rate of upper incisal margin was .%,. % and . % respectively( P <0.0).
上切缘阳性率分别为 . %、. %和 . % (P <0 .0 ) ;