With a few exceptions, comments on the previous page about the Arch Opposing_Base hold true for the Quadrant Opposing_Base. Not only can it be used as an "Upper" or "Lower," but owing to its twin snap design on the anterior, it can also be used as a "Left" or "Right." It has the large, female sleeve on both sides, thus enhancing its multifunction design, allowing it to be attached to the Opposing Index-Plate and used to pour Triple Tray impressions on the Pouring Jig.
Refer to the Home Page under section entitled "Using the System," and go to "Pouring Triple Tray Impressions (using the Pouring Jig)."
All Bases have a slot on the posterior surface to receive a Vertex® or similar articulator and is also designed to receive a Mounting-Plate... Exception: Articulated Triple Tray System Bases do not need or contain this feature.