Stability (not rocking) and retention (grip) come from 3 aspects of the acrylic denture:
- The denture fitting closely and tightly against the gums and natural teeth
- The use of wrought metal clasps (retainers) to grip the teeth
- In cases where only a few teeth remain; a well fitting base plate, covering as much of the hard tissue, (that's the jawbone, palate and ridges) in your mouth as possible.
They are 'mucosal borne dentures'- meaning they get support (resist chewing forces) by sitting on your ridges.