Lower
Arch RTP_Base:
Lower RTP_Bases are similar to Upper RTP_Bases with one exception, the female snap on the anterior of the Lower Bases are not flush, but protrude out from the surface so that the same Mounting-Plate for a given size can be used. (Remember, the female snap on the Upper is flush with the anterior surface.)
If
there is ever any question as to upper or lower and left or
right, just check the
engraving between the first and second molar.