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5. Prosthodontic Instruments


a. Abutment. A tooth used for the support or anchorage of a fixed or removable prosthesis.

b. Adjustment. A modification of a denture base or the teeth on a denture after the prosthesis has been completed and inserted in the mouth.

c. Baseplate. A temporary form representing the base of the denture which is used for making maxillomandibular records, for arranging denture teeth, or for trial insertion in the mouth.

d. Cast. A positive reproduction of the form of the tissues of the maxillae or mandible. After the impression of the tissues has been made, plaster of Paris or artificial stone is poured into the impression to form the cast. Denture bases or other dental restorations may be fabricated over these casts.

e. Clasp. A part of the removable partial denture which acts as a direct retainer or stabilizer for the denture by partially surrounding or contacting an abutment tooth.

f. Complete Denture. A prosthesis which replaces teeth and associated structures in a complete edentulous arch.

g. Cuspid Line. A vertical line scribed on the occlusion rim to indicate the position that the artificial cuspid tooth is to occupy in the trial denture setup.

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 maxillomandibular relation.

s. Vertical Dimension. A vertical measurement of the face between any two arbitrarily selected points that are conveniently located one above and one below the mouth, usually in the midline.

David L. Heiserman, Editor

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Revised: June 06, 2015