h. Denture Base. That part of a denture which rests on the oral mucosa and to
which denture teeth are attached.
i. Fixed Partial Denture. A partial denture that cannot be removed readily by
either the patient or the dental officer. It is permanently attached to the teeth that
furnish the support to the restoration.
j. Immediate Denture. A dental prosthesis constructed for insertion
immediately following the removal of natural teeth.
k. Impression. An imprint or negative form of the teeth or other tissues of the
oral cavity made in a plastic material that becomes relatively hard or set while in contact
with these tissues. Material is poured into this impression to produce a positive form or
cast of the recorded tissues. Impressions are classed according to the type of material
of which they are made, according to the structures included or recorded in the
impression material, or according to the purpose, such as partial denture impression or
complete denture impression.
l. Interocclusal Record. A record of the positional relation of the teeth or jaws
to each other, usually made of a plastic material which hardens. Its purpose is to relate
the casts in the same position on the articulator.
m. Occlusal Equilibration. The modification of occlusal forms of teeth by
grinding with the intent of equalizing occlusal stress or harmonizing cuspal relations.
n. Occlusion Rim. An occluding surface built on a temporary or permanent
denture base to make records showing the relationship of the maxillae to the mandible
or to arrange artificial teeth.
o. Removable Partial Denture. A prosthesis that replaces one or more, but
less than all, of the natural teeth and associated structures and is supported by the
teeth or the mucosa. It can be readily inserted and removed by the wearer.
p. Rest. An extension from a prosthesis that affords vertical support for a
restoration. It is named for the area of the tooth it contacts, for example, occlusal rest.
q. Rest Position. The habitual postural position of the mandible when the
patient is resting comfortably in the upright position and the condyles are in a neutral,
unstrained position in the mandibular fossae.
r. Try-in. A preliminary insertion of a complete denture wax-up, a partial
denture casting, or a finished restoration to determine the fit, esthetics, and