baseplate

noun

1. bedplate.
2. Dentistry.
   1. a sheet of plastic material for making trial denture plates.
   2. the portion of a denture in contact with the jaw.
3. Metallurgy. a plate of metal to be clad with another metal.

n.

1. The portion of an artificial denture in contact with the jaw.
2. A temporary form representing the base of a denture and used to help establish jaw relationships and the arrangement of teeth.