A.    Sprue - the channel or hole through which plastic or metal is poured or cast into a gate or reservoir and then into a mold

B.     Interproximal - the area of a tooth that is in close association with another tooth in an adjacent arch. 

C.     Registration marks - the recording of the jaw relationships present to assist in the proper fabrication of dental prostheses. 

D.    Rugae - the tissue ridges located on the anterior of the hard palate of the maxilla jaw. 

E.     Tuberosity - the most distal portion of the maxilla alveolar ridge

F.      Polymerization - the forming of a compound by the joining together of molecules of small molecular weights into a compound of large molecular weight 

G.    Custom tray - an individualized impression made from a cast recovered from a preliminary impression. It is used to make a final impression. 

H.    Festooning - carvings in the base material of a denture that simulate the contours of the natural tissue that are being replaced by the denture. 

I.        Centric Occlusion - the occlusion of opposing teeth when the mandible is in centric relation. 

J.       Palatine Fovea - two small pits or depressions in the posterior aspect of the palatal mucosa (the maxilla)

K.    Post Palatal Seal - An elevation of acrylic resin on the tissue side of the posterior border of a maxillary appliance for the purpose of sealing it against the resilient soft tissue in the palate.

L.     Vibrating Line - an imaginary line across the posterior part of the palate marking the division between the movable and immovable tissues of the soft palate. 

M.   Balanced Occlusion - the bilateral, simultaneous, anterior, and posterior occlusal contact of teeth in centric and eccentric positions. 

N.    Flasking/ Invest - the process of investing the sast and a wax replica of the desired form in a flash preparatory to mold the restorative material into the desired product.

O.    Papilla -  any small, nipple shapes elevation. 

P.      Tricuspid - denoting three cusps. 

Q.    Bifurcated - having two roots

R.     Sulcus - a shallow fissure between the marginal gingiva and the enamel. 

S.      Diastema - a space between two adjacent teeth in the dental arch. 

T.     Bilateral - having two sides.

U.    Protrusive - thrusting forwards.

V.    Prosthetic Dentistry - a clinical diagnostic index classification for anything related to prosthodontics. 

W.   Compensating Curve - the anteroposterior curving and the mediolateral curving within the alignment of the occluding surfaces and incisal edges of artificial teeth that are used to develop balanced occlusion. 

X.    Wax-up - the contouring of a pattern in wax generally applied to the shaping in wax of the contours of a trial denture. 

Y.    Try-in - the process of placing a trial denture. 

Z. Porosity  - the presence of voids or pores.