| 영문 | enamel | 한글 | 사기질 |
|---|---|---|---|
| 설명 | 치아의 한 부분을 이르는 말이다. 치아관을 피복하는 회백색 반투명의 단단한 물질이다. 치아는 크게 치아관(crown)과 치근(root)으로 나눌 수가 있다. 치아관이란 구강내로 돌출하고 있는 치아의 부분이며, 치근이란 치아관 아래에 존재하는 치아의 부분을 말한다. 사기질은 치아관을 둘러싸고 있는 아주 단단한 조직으로 우리가 입안으로 직접 관찰할 수가 있는 흰색을 띠는 것이다. 전신에서 가장 단단한 부분으로 굳기 6~7° 이므로 석영과 거의 비슷하다. 사기질소주라고 하는 3~5μm 굵기의 사상체의 집합으로 한 개의 이에 수백만 개의 작은기둥이 있다. 사기질은 한번 마모되거나 녹아 버리면 다시 신생되지 않는다. 잇몸의 내부에 있는 치근부에서는 상아질 표면이 시멘트질로 덮여 있다. 사기질에는 신경이 없으므로 여기에 생긴 충치에는 치통이 없으나, 상아질까지 침범되었을 때 냉수가 스며들면 이가 시리고 치통이 시작된다. 소량의 플루오르화물을 섭취하면 이가 건강해진다고 하지만 과다하면 사기질을 상하게 한다. |
||
| 1 Knot(노트) | = 1 해리/Hr = 0.51 m/sec |
|---|---|
| CEJ | cement-enamel junction |
| DEJ, dej | dentino-enamel junction; dermo-epidermal junction |
| ERS | enamel-renal syndrome; endoscopic retrograde sphincterectomy |
| IEE | inner enamel epithelium |
| EMD | Enamel Matrix Derivative |
|---|---|
| LEH | Linear enamel hypoplasias |
| CEJ | cement enamel junction |
| DEJ | dentin enamel junction |
| EDJ | enamel dentine junction |
| vital knot | A circumscript region in the lower part of the medulla oblongata, near the apex of the calamus scriptorius, interpreted by M. Flourens (1858) as a nerve centre controlling respiration. Synonym: vital knot, vital node. Origin: Fr. (05 Mar 2000) |
|---|---|
| granny knot | A double knot in which the free ends of the second loop are asymmetric and not in the same plane as the free ends of the first loop. (05 Mar 2000) |
| primitive knot | A local thickening of the blastoderm at the cephalic end of the primitive streak of the embryo. Synonym: Hensen's knot, Hensen's node, Hubrecht's protochordal knot, primitive knot, protochordal knot. (05 Mar 2000) |
| Hensen's knot | Synonym: primitive node. (05 Mar 2000) |
| protochordal knot | A local thickening of the blastoderm at the cephalic end of the primitive streak of the embryo. Synonym: Hensen's knot, Hensen's node, Hubrecht's protochordal knot, primitive knot, protochordal knot. (05 Mar 2000) |
| Hubrecht's protochordal knot | A local thickening of the blastoderm at the cephalic end of the primitive streak of the embryo. Synonym: Hensen's knot, Hensen's node, Hubrecht's protochordal knot, primitive knot, protochordal knot. (05 Mar 2000) |
| net knot | <cell biology> The central portion of a cells nucleus that typically contains a glob of heterochromatin. Origin: Gr. Soma = body (09 Oct 1997) |
| surgeon's knot | The first loop of the knot has two throws rather than a single throw. The second loop has only one throw and that is placed in a square knot fashion leaving the free ends in the same plane as the first loop. (05 Mar 2000) |
| syncytial knot | A localised aggregation of syncytiotrophoblastic nuclei in the villi of the placenta during early pregnancy. Synonym: syncytial bud, syncytial sprout. (05 Mar 2000) |
| true knot | True knot of umbilical cord, actual intertwining of a segment of umbilical cord; circulation is usually not obstructed. (05 Mar 2000) |
| knot | 1. To form knots or joints, as in a cord, a plant, etc.; to become entangled. "Cut hay when it begins to knot." (Mortimer) 2. To knit knots for fringe or trimming. 3. To copulate; said of toads. 1. A fastening together of the pars or ends of one or more threads, cords, ropes, etc, by any one of various ways of tying or entangling. A lump or loop formed in a thread, cord, rope. Etc, as at the end, by tying or interweaving it upon itself. An ornamental tie, as of a ribbon. The names of knots vary according to the manner of their making, or the use for which they are intended; as, dowknot, reef knot, stopper knot, diamond knot, etc. 2. A bond of union; a connection; a tie. "With nuptial knot." "Ere we knit the knot that can never be loosed." (Bp. Hall) 3. Something not easily solved; an intricacy; a difficulty; a perplexity; a problem. "Knots worthy of solution." (Cowper) "A man shall be perplexed with knots, and problems of business, and contrary affairs." (South) 4. A figure the lines of which are interlaced or intricately interwoven, as in embroidery, gardening, etc. "Garden knots." "Flowers worthy of paradise, which, not nice art In beds and curious knots, but nature boon Poured forth profuse on hill, and dale, and plain." (Milton) 5. A cluster of persons or things; a collection; a group; a hand; a clique; as, a knot of politicians. "Knots of talk." "His ancient knot of dangerous adversaries." (Shak) "Palms in cluster, knots of Paradise." (Tennyson) "As they sat together in small, separate knots, they discussed doctrinal and metaphysical points of belief." (Sir W. Scott) 6. A portion of a branch of a tree that forms a mass of woody fibre running at an angle with the grain of the main stock and making a hard place in the timber. A loose knot is generally the remains of a dead branch of a tree covered by later woody growth. 7. A knob, lump, swelling, or protuberance. "With lips serenely placid, felt the knot Climb in her throat." (Tennyson) 8. A protuberant joint in a plant. 9. The point on which the action of a story depends; the gist of a matter. "I shoulde to the knotte condescend, And maken of her walking soon an end." (Chaucer) 10. <mechanics> See Node. 11. A division of the log line, serving to measure the rate of the vessel's motion. Each knot on the line bears the same proportion to a mile that thirty seconds do to an hour. The number of knots which run off from the reel in half a minute, therefore, shows the number of miles the vessel sails in an hour. Hence: A nautical mile, or 6080.27 feet; as, when a ship goes eight miles an hour, her speed is said to be eight knots. 12. A kind of epaulet. See Shoulder knot. 13. <zoology> A sandpiper (Tringa canutus), found in the northern parts of all the continents, in summer. It is grayish or ashy above, with the rump and upper tail coverts white, barred with dusky. The lower parts are pale brown, with the flanks and under tail coverts white. When fat it is prized by epicures. Called also dunne. The name is said to be derived from King Canute, this bird being a favorite article of food with him. "The knot that called was Canutus' bird of old, Of that great king of Danes his name that still doth hold, His appetite to please that far and near was sought." (Drayton) Origin: OE. Knot, knotte, AS. Cnotta; akin to D. Knot, OHG. Chnodo, chnoto, G. Knoten, Icel. Kntr, Sw. Knut, Dan. Knude, and perh. To L. Nodus. Cf. Knout, Knit. Source: Websters Dictionary (01 Mar 1998) |
| laparoscopic knot | A knot placed intracorporally through a laparoscopic instrument. The knot itself may be tied extracorporally and passed into the body through a cannula or the knot may be both placed and tied intracorporally. (05 Mar 2000) |
| reduced enamel epithelium | The several layers of the enamel organ remaining on the enamel surface after formation of enamel is completed. Synonym: reduced enamel epithelium. (05 Mar 2000) |
| mottled enamel | Alterations in enamel structure due to excessive fluoride ingestion during tooth formation; varies in appearance from small white opacities to yellow and black spotting. Nanoid enamel, a condition of abnormal thinness of the enamel. Synonym: dwarfed enamel. Whorled enamel, enamel in which the rods assume a spiral or twisting course. (05 Mar 2000) |
| dental enamel | <dentistry> A hard thin translucent layer of calcified substance which envelops and protects the dentin of the crown of the tooth. It is the hardest substance in the body and is almost entirely composed of calcium salts. Under the microscope, it is composed of thin rods (enamel prisms) held together by cementing substance, and surrounded by an enamel sheath. (12 Dec 1998) |
제품명 |
판매사 |
보험코드 | 성분/함량 | 구분/보험급여 |
|---|
제품명 |
판매사 |
보험코드 | 성분/함량 | 구분/보험급여 |
|---|