I only hope for retention of the mandibular denture but I try to make it stable. This starts with the tray. After you have shortened the borders, seat the tray and take your hands off the tray. If the tray jumps up then it still may be overextended.
I continue to use this hands off technique throughout the border molding process. It will help make mandibular dentures that don't jump up. It was my best practice builder.
Naturally a compound border that is too long will make the tray lift up. However, even a too thick border can cause the tray to rise.
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©1999 by Julius Rosen, D.D.S.