GPT Terms – V

vacuum casting : the casting of a material (i.e., metal, plastic) in the presence of a partial vacuum

vacuum investing : the process of investing a pattern within a partial vacuum

vacuum mixing : a method of mixing a material such as plaster of paris or casting investment below atmospheric pressure

val·ue : the quality by which a light color is distinguished from a dark color, the dimension of a color that denotes relative blackness or whiteness (grayness, brightness). Value is the only dimension of color that may exist alone—see MUNSELL VALUE

van der Walls’ bond [Johannes D. van der Walls, Dutch physicist] (ca 1926): eponym for a bond that involves weak inter-atomic attractions such as variation in physical mass or location of electrical charge; e.g., molecular polarization, electrical dipoles and dispersion effects—hydrogen bridges—called also secondary bond

vascular pain : a type of deep somatic pain of visceral origin that emanates from the afferent nerves that innervate blood vessels

ve·lum : a covering; a general term for a veil or veil

like structure—see SOFT PALATE

veneer : 1: a thin sheet of material usually used as a finish 2: a protective or ornamental facing 3: a superficial or attractive display in multiple layers, frequently termed a laminate veneer

1vent n: 1: a small auxiliary sprue to aid and improve casting procedures 2: a small perforation placed in a cast restoration to facilitate complete cementation by minimizing hydraulic pressure

2vent v: venting ppr: 1: to place an auxiliary sprue 2: to place a perforation

verti-centric \vûr?t?-se?n?tri?k\ [Earl Pound, U.S. prosthodontist, 1901-1986]: a record used in complete removable dental prosthesis fabrication. It involves the simultaneous recording of the vertical dimension of occlusion with the jaws in centric relation


vertical axis of the mandible: an imaginary line around which the mandible may rotate through the horizontal plane

vertical dimension : the distance between two selected anatomic or marked points (usually one on the tip of the nose and the other upon the chin), one on a fixed and one on a movable member—see OCCLUSAL V.D., REST V.D., V.D. OF SPEECH

vertical dimension decrease : decreasing the vertical distance between the mandible and the maxillae by modifications of teeth, the positions of teeth or occlusion rims, or through alveolar or residual ridge resorption (GPT-1)

vertical dimension increase : increasing the vertical distance between the mandible and the maxillae by modifications of teeth, the positions of teeth, or occlusion rims (GPT-1)—see OCCLUSAL VERTICAL DIMENSION

vertical dimension of occlusion: see OCCLUSAL VERTICAL DIMENSION

vertical dimension of rest position: see PHYSIOLOGIC REST POSITION

vertical dimension of speech : that distance measured between two selected points when the occluding members are in their closest proximity during speech

vertical opening: see VERTICAL DIMENSION

vertical overlap 1: the distance teeth lap over their antagonists as measured vertically; especially the distance the maxillary incisal edges extend below those of the mandibular teeth. It may also be used to describe the vertical relations of opposing cusps 2: the vertical relationship of the incisal edges of the maxillary incisors to the mandibular incisors when the teeth are in maximum intercuspation

ves·ti·bule 1: any of various bony cavities, especially when serving as or resembling an entrance to another 2: the portion of the oral cavity that is bounded on the medial side by the teeth, gingiva, and alveolar ridge or the residual ridge, and on the lateral side by the lips and cheeks—see BUCCAL V., LABIAL V.

ves·tib·u·lo·plas·ty : a surgical procedure designed to restore alveolar ridge height by lowering muscles attaching to the buccal, labial, and lingual aspects of the jaws

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. This can be identified when the movable tissues are functioning

Vickers hardness number: (VHN) a measure of hardness obtained with a diamond pyramidal indenter with a square base and an angle of 136°. VHN is proportional to the ratio of the applied load to the area of the indentation. Devised in the 1920’s by engineers at Vickers, Ltd. in the United Kingdom

videofluoroscopy : dynamic x-rays recorded on videotape

viewing conditions : various conditions under which visual observation is made including the size of the stimulus, characteristics of the surrounding area, nature of the illuminant, angle of viewing, area of the retina, etc.

Virginia bridge: see RESIN-BONDED PROSTHESIS

visceral pain : deep somatic pain originating in visceral structures such as mucosal linings, walls of hollow viscera, parenchyma of organs, glands, dental pulps, and vascular structures

visible spectrum : the section of the electromagnetic spectrum that is visible to the human eye. It ranges from 380 nm to 760 nm

visual adaptation : adjustive change in visual sensitivity due to continued visual stimulation or lack of stimulation. Three recognized types are: 1) scotopic or dark adaptation 2) photopic or light adaptation 3) chromatic or color adaptation

visual photometry: the measurement of luminous radiation based on its effect on the visual receptors

vul·can·ite: an obsolete denture base material that is a combination of caoutchouc and sulfur. These harden in the presence of suitable heat and application of pressure

vul·can·izenized; –niz·ing : to produce flexible or hard rubber, as desired, by subjecting caoutchouc, in the presence of sulfur, to heat and high steam pressure in a processing unit, termed a vulcanizer, made for that purpose

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