Rest vertical dimension is the lower face height measured from chin point to nasospinale, with the mandible in rest position.

垂距离的概念可以是指下颌位于姿势位时这两个之的距离，主要与肌功能有关。

The length of the face determined by the distance of separation of jaws. The reference mark are nasospinale and chin point .The distance of these two marks is VD.

临床上，面下部垂距离的参考一般用鼻下和颏下，这两分别位于口裂的上、下方。