| crown inclination | <dentistry> A tooth movement in which the root of the tooth is tipped toward cheeks (lips) or toward the lingual (palate) of the mouth. (08 Jan 1998) |
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| crown lengthening | Technique combining controlled eruptive tooth movement and incision of the supracrestal gingival attachment to allow for proper restoration of a destroyed or damaged crown of a tooth. Controlled eruption of the tooth is obtained using orthodontic appliances. During this eruptive phase, repeated incisions are made at the junctional epithelium of the sulcus and the supracrestal connective tissue to prevent coronal displacement of the gingiva and of the attachment apparatus. (12 Dec 1998) |
| crown of head | The topmost part of the head. Synonym: crown of head. (05 Mar 2000) |
| crown of tooth | The portion of a tooth covered with enamel. Synonym: corona dentis, anatomical crown. (05 Mar 2000) |
| crown of Venus | Papular lesions of secondary syphilis on the forehead near the hair margin. See: collar of Venus. (05 Mar 2000) |
| crown-rump length | In utero measurement corresponding to the sitting height (crown to rump) of the foetus. Length is considered a more accurate criterion of the age of the foetus than is the weight. The average crown-rump length of the foetus at term is 36 cm. (12 Dec 1998) |
| crown tubercle | Tubercle of cuneate nucleus, the bulbous rostral extremity of the fasciculus cuneatus corresponding to the position of the cunate nucleus, lying lateral to the clava and separated from the tuberculum cinereum on its lateral side by the posterior lateral sulcus. Synonym: tuberculum nuclei cuneati, tuberculum cuneatum, wedge-shaped tubercle. (05 Mar 2000) |
| tooth crown | The upper part of the tooth, which joins the lower part of the tooth (tooth root) at the cervix (tooth cervix) at a line called the cementoenamel junction. The entire surface of the crown is covered with enamel which is thicker at the extremity and becomes progressively thinner toward the cervix. (12 Dec 1998) |
| jacket crown | A hollow crown of acrylic resin, fused porcelain or cast gold, combinations of gold and acrylic or gold and porcelain; it fits over the prepared stump of the natural crown. (05 Mar 2000) |
| antirheumatic agents, gold | Gold salts that are effective in the therapy of rheumatoid arthritis. These compounds usually do not have analgesic activity. Since these compounds are poorly absorbed from the intestinal tract, they are usually given intramuscularly. (12 Dec 1998) |
| mat gold | Powdered gold formed by electrolytic precipitation, compressed into strips, and sintered. (05 Mar 2000) |
| gold | 1. <chemistry> A metallic element, constituting the most precious metal used as a common commercial medium of exchange. It has a characteristic yellow colour, is one of the heaviest substances known (specific gravity 19.32), is soft, and very malleable and ductile. It is quite unalterable by heat, moisture, and most corrosive agents, and therefore well suited for its use in coin and jewelry. Symbol Au (Aurum). Atomic weight 196.7. Native gold contains usually eight to ten per cent of silver, but often much more. As the amount of silver increases, the colour becomes whiter and the specific gravity lower. Gold is very widely disseminated, as in the sands of many rivers, but in very small quantity. It usually occurs in quartz veins (gold quartz), in slate and metamorphic rocks, or in sand and alluvial soil, resulting from the disintegration of such rocks. It also occurs associated with other metallic substances, as in auriferous pyrites, and is combined with tellurium in the minerals petzite, calaverite, sylvanite, etc. Pure gold is too soft for ordinary use, and is hardened by alloying with silver and copper, the latter giving a characteristic reddish tinge. [See Carat] Gold also finds use in gold foil, in the pigment purple of Cassius, and in the chloride, which is used as a toning agent in photography. 2. Money; riches; wealth. "For me, the gold of France did not seduce." (Shak) 3. A yellow colour, like that of the metal; as, a flower tipped with gold. 4. Figuratively, something precious or pure; as, hearts of gold. Age of gold. See Golden age, under Golden. Dutch gold, Fool's gold, Gold dust, etc. See Dutch, Dust, etc. Gold amalgam, a mineral, found in Columbia and California, composed of gold and mercury. Gold beater, one whose occupation is to beat gold into gold leaf. Gold beater's skin, the prepared outside membrane of the large intestine of the ox, used for separating the leaves of metal during the process of gold-beating. <zoology> Gold beetle See Cradle. Gold diggings, the places, or region, where gold is found by digging in sand and gravel from which it is separated by washing. Gold end, a fragment of broken gold or jewelry. Gold-end man. A buyer of old gold or jewelry. A goldsmith's apprentice. An itinerant jeweler. "I know him not: he looks like a gold-end man." . Gold fever, a popular mania for gold hunting. Gold field, a region in which are deposits of gold. Gold finder. One who finds gold. One who empties privies. Gold flower, a composite plant with dry and persistent yellow radiating involucral scales, the Helichrysum Stoechas of Southern Europe. There are many South African species of the same genus. Gold foil, thin sheets of gold, as used by dentists and others. See Gold leaf. <botany> Gold knobs or knoppes A small evergreen plant (Coptis trifolia), so called from its fibrous yellow roots. It is common in marshy places in the United States. Gold tissue, a tissue fabric interwoven with gold thread. Gold tooling, the fixing of gold leaf by a hot tool upon book covers, or the ornamental impression so made. Gold washings, places where gold found in gravel is separated from lighter material by washing. Gold worm, a glowworm. Jeweler's gold, an alloy containing three parts of gold to one of copper. Mosaic gold. See Mosaic. Origin: AS. Gold; akin to D. Goud, OS. & G. Gold, Icel. Gull, Sw. & Dan. Guld, Goth. Gulp, Russ. & OSlav. Zlato; prob. Akin to E. Yellow. See Yellow, and cf. Gild. Source: Websters Dictionary (01 Mar 1998) |
| gold alloy | An alloy whose principal ingredient is gold, usually contains copper or platinum and silver; used in dentistry for restorations requiring considerable strength. (05 Mar 2000) |
| gold alloys | Alloys that contain a high percentage of gold. They are used in restorative or prosthetic dentistry. (12 Dec 1998) |
| gold casting | A casting made of gold, usually formed to represent and replace lost tooth structure. (05 Mar 2000) |