下门牙或下颌突出的下颌或牙突出超过上颌或牙的；
Having the lower jaw or teeth projecting beyond the upper; underhung.
剪状咬合，严重的下颌突出或上颌突出都属于有缺陷。
Teeth Scissors bite. A badly undershot or overshot mouth is a fault.
国字脸：这种脸型轮廊很鲜明，下颌线条突出，前额、下巴以及两颊的颧骨骨都相对较宽。
Square face: This face has strong angles, strong jaw, wide forehead, wide chin and wide cheekbones.
下颌宽，轻微的下颌突出式咬合。
咬合必须是下颌突出式咬合，就是说，下颌的门牙必须比上颌的门牙向前突出一些。
Jaws must be undershot. The incisors of the lower jaw should protrude over the upper incisors.
我们描述一个案件突出一个严重的并发症，使用空气转子清除有权下颌第二磨牙。
We describe a case which highlights a serious complication of the use of an air rotor for the removal of a right second mandibular molar.
其主要临床特征为智力低下、特殊的外貌特征（包括长脸、大耳廓、下颌突出、巨头、腭弓高、大睾丸等）、行为及认知障碍、多动、注意力难集中以及孤独、自闭等症状。
FXS is characterized by X-linked mental retardation with additional features such as a long face with large protruding ears, macroorchidism, and eye-gaze avoidance etc.
其主要临床特征为智力低下、特殊的外貌特征（包括长脸、大耳廓、下颌突出、巨头、腭弓高、大睾丸等）、行为及认知障碍、多动、注意力难集中以及孤独、自闭等症状。
FXS is characterized by X-linked mental retardation with additional features such as a long face with large protruding ears, macroorchidism, and eye-gaze avoidance etc.
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