gnathostatic cast

gnathostatic cast

[nā′thōstat′ik]

Etymology: Gk, gnathos + statike, weighing; ME, casten

a cast of the teeth trimmed so that its occlusal plane is in its normal oral attitude when the cast is set on a horizontal surface. It is used in orthodontic diagnosis based on gnathostatics.

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cast,

n 1. an object formed by pouring plastic or liquid material into a mold in which it hardens.
v 2. to throw metal into an impression to form the casting.

Screen-type cassette.

cast, bar splint,

n See splint, cast bar.

cast, corrected master,

n a dental cast that has been modified by the correction of the edentulous ridge areas as registered in a supplemental, correctable impression.

cast, dental,

n a positive likeness of a part or parts of the oral cavity reproduced in a durable hard material.

cast, diagnostic,

n a positive likeness of dental structures for the purpose of study and treatment planning.

cast, diagnostic, anatomic portion,

n the section of a finished cast that contains the actual impression of the teeth and surrounding tissue. It should account for approximately 65% of the cast's total height.

cast, diagnostic, double-pour method,

n a method of forming the base of a cast in which the inverted impression is held against the surface of prereadied stone while the sides and edges of the cast are shaped; eliminates the possibility of inverting the impression before the stone has set. Also called
two-step method.

cast, diagnostic, implant,

n a cast made from a conventional mucosal impression on which the wax trial denture and surgical impression trays are made or selected.

cast, gnathostatic

n a cast of the teeth trimmed so that the occlusal plane is in its normal position in the oral cavity when the cast is set on a plane surface. Such casts are used in the gnathostatic technique of orthodontic diagnosis.

cast, implant,

n a positive reproduction of the exposed bony surfaces made in a surgical bone impression and on which subperiosteal implant frame is designed and fabricated.

cast, investment,

n See cast, refractory.

cast, keying of,

n the process of forming the base (or capital) of a cast so that it can be remounted accurately. Also referred to as the split-cast method of returning a cast to an articulator.

cast, master,

n an accurate replica of the prepared tooth surfaces, residual ridge areas, or other parts of the dental arch reproduced from an impression from which a prosthesis is to be fabricated.

cast, mounted,

n a reproduction of all or part of the oral cavity, which is then attached to a support for ease of display.

cast, preextraction,

n a cast made before the extraction of teeth. See also cast, diagnostic.

cast, preoperative,

n See cast, diagnostic.

cast, record,

n a positive replica of the dentition and adjoining structures, used as a reference for conditions existing at a given time.

cast, refractory,

n a cast made of materials that can withstand high temperatures without disintegrating and that, when used in partial denture casting techniques, expand to compensate for metal shrinkage.

cast, trimming diagnostic,

n a set of finishing steps for a study cast in which the bases, posterior borders, sides, heels, and anterior surfaces are smoothed and shaped to ensure a finished product that is attractive, well proportioned, and useful as a diagnostic tool. The treatment is best accomplished using a mechanical model trimmer.

cast, working,

n an accurate reproduction of a master cast; used in preliminary fitting of a casting to avoid injury to the master cast.