Quadrant
Open_Base (used to replace the conventional
stone base):
Medium (green) Quadrant Open_Bases shown (OPEN-7 and OPEN-9).
The quadrant Open_Base is basically the same as the arch except there is
a left and right for each given size.
There is a set of index marks for each cuspid and each
first molar location. This is necessary because Open_Bases can be
used as either an upper or lower. The lower cuspid and
lower first molar in a normal mouth is usually anterior of the upper
cuspid and upper first molar. Aligning the teeth to the correct index
marks will insure a better relationship between the upper and lower
models when articulated.
Using the Open_Base has several advantages over the conventional stone base:
1. Uses less stone and allows less shrinkage
(dimensionally more stable).
2. A Mounting-Plate can be used if the case
is to be plaster mounted on a rigid articulator. This procedure will
render a model that is easily removed and reattached to the
articulator. Refer to the Home Page under section entitled
"System Parts Overview" and go to "Mounting-Plates".
3. Less cleanup and better overall appearance.
4. Less shipping weight.