上颌突出式咬合被严格禁止。
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.
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.
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.
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.
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