| 单词 | dentine |
| 例句 | Sometimes there would just be the scream of the drill and the smell of burning dentine, sometimes there would be anaesthetic gas and extractions. We're all going on a ... 2011-07-30T23:04:12Z Hard, protective body scales, made of mineralized tissue such as dentine or enamel, could have migrated into the mouth—a hypothesis known as outside-in. Ancient Sawfish Help to Illuminate Our Teeth’s Scaly Origins 2022-12-02T05:00:00Z Maya dentists drilled holes into the enamel and dentine, then fit the stones and applied a sealant, usually as part of a rite of passage to adulthood. Ancient Maya tooth sealant glued gemstones in place—and may have prevented tooth decay 2022-05-20T04:00:00Z But these teeth, like most animal teeth, are composed of a substance called dentine, capped by a hard, thin covering of enamel. How Did Elephants and Walruses Get Their Tusks? It’s a Long Story. 2021-10-28T04:00:00Z The dentine connects to the innermost pulp, where nerve cells live. 'Ice-cream toothache': Cold food and drinks pain explained 2021-03-26T04:00:00Z Their study showed a broad light-colored area in the dentine a few days prior to delivery that switched to a dark band immediately afterward. The birth certificate in your mouth 2019-09-08T04:00:00Z The dentine consists of nanoscale fibers of the protein called collagen coated with a crystalline form of a mineral called hydroxyapatite, common in bones and teeth. Scientists solve the mystery of the dragon with transparent teeth 2019-06-05T04:00:00Z In dentine from the teeth, they found collagen proteins suitable for analysis. Biggest Denisovan fossil yet is the first found outside Siberian cave 2019-04-30T04:00:00Z Tusks have no enamel, Dr. Whitney said, and grow continuously even as the comparatively softer dentine gets worn away. How Did Elephants and Walruses Get Their Tusks? It’s a Long Story. 2021-10-28T04:00:00Z These plates sit where other mammals have teeth, but rather than robust dentine, the principle ingredient of teeth, they are composed of keratin, a flexible material that also makes up hair and fingernails. How whales started filtering food from the sea 2017-06-29T04:00:00Z As the sponge broke down it was replaced by dentine, healing the tooth. 'Tooth repair drug' may replace fillings - BBC News 2017-01-09T05:00:00Z Restoring the tooth’s original dentine structure is preferable because dental cements used in conventional fillings weaken the tooth, leave it prone to future infections – and inevitably erode or detach. Decline of the dentist's drill? Drug helps rotten teeth regenerate, trial shows 2017-01-09T05:00:00Z The lines provide a record of the tooth’s history: Each line represents the daily deposit of bony tissue called dentine within the tooth’s enamel shell. Dinosaur babies took a long time to break out of their shells 2017-01-02T05:00:00Z Their geometry means they are good at digging into and thus adhering to surfaces—including the dentine lining of an evacuated root canal. Tooth fairy-dust 2015-10-29T04:00:00Z Teeth are made of tough tissue called dentine, surrounded by an outer coating of enamel. Structural secret of T. rex's bone-crushing teeth - BBC News 2015-07-29T04:00:00Z Mature tissues such as dentine contain stem cells of more limited capability, which keep up a supply of new specialised cells to replace old ones as they die. An enlightened approach 2014-05-29T04:00:00Z The teeth begin growing before birth, but while a child is still in the womb the placenta blocks most barium—but not calcium—from reaching their dentine and enamel. How Long Did Neandertals Breastfeed? 2013-05-22T19:00:00Z Sloth teeth lack enamel and are composed instead of two different kinds of dentine plus an outer layer of cementum, the softer dentine forming the innermost region of the tooth. The anatomy of sloths 2012-08-30T19:15:03.553Z The crowns of the teeth are greatly reduced in height, and the dentine is thin. Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado 2012-02-24T03:00:32.243Z The researchers discovered a special arrangement of layers of dentine at the base of each serration in the tooth. Structural secret of T. rex's bone-crushing teeth - BBC News 2015-07-29T04:00:00Z Dendroden′tine, the form of branched dentine seen in compound teeth, produced by the interblending of the dentine, enamel, and cement. Chambers's Twentieth Century Dictionary (part 1 of 4: A-D) 2011-10-11T02:01:08.990Z Finally, enamel itself and dentine are developed, and the embryonic tooth remains covered under the gums until it cuts them. Embryology The Beginnings of Life 2011-09-12T02:00:28.483Z For instance, the molars when first developed have tritubercular summits, but these soon become worn away, leaving tall columnar crowns, with a subcircular surface of dentine exposed at the summit of each. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z The congestion of the sensitive dentine or the irritation of an exposed nerve filament causes about as severe pain as it is given to mortals to bear. Psychotherapy 2011-06-19T02:00:20.053Z Their microscopic structure approaches to that of the dentine of such Carboniferous fishes as Diplodus. The Chain of Life in Geological Time A Sketch of the Origin and Succession of Animals and Plants 2011-06-01T02:00:24.880Z This models the enamel cap which fits over the dentine like a glove. Degeneracy Its Causes, Signs and Results 2011-05-02T02:00:17.657Z The uncoloured portions are the dentine or ivory, the shaded parts the cement filling the cavities and surrounding the exterior. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 7 "Equation" to "Ethics" 2011-02-27T03:00:31.973Z Formation of both enamel and dentine are particularly sensitive to physiological changes – and can therefore show the effects of illness or anxiety during their development. Reflections on Biology and Motherhood: Where do Homo sapiens Fit In? 2011-02-25T14:45:00.237Z “They already had teeth in the upper jaw, so they had the enamel, dentine and other necessities,” he said. Observatory: A Frog Evolved to Regain the Teeth Its Ancestors Jettisoned 2011-02-08T22:50:11Z The teeth are subcylindrical, of persistent growth, consisting of a central axis of vasodentine, with a thin investment of hard dentine, and a thick outer coating of cement; without any succession. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10 "Echinoderma" to "Edward" 2011-01-19T03:00:19.027Z Any deviation in size or contour of the permanent teeth from the normal must hence be due to defect in nutrition in the dentine bulb, between the fifteenth and twenty-fifth week of fœtal life. Degeneracy Its Causes, Signs and Results 2011-05-02T02:00:17.657Z Most genetics research on ancient teeth has focused on the inner tooth tissue, dentine, but Adler's team found that cementum, the coating of the root, was a richer source of DNA. Researchers to drill for ancient DNA in 'hobbit' tooth 2011-01-05T23:15:00.950Z A. von Leeuwenhoek in 1678 described with much accuracy the tubular structure of the dentine, thus making the most important contribution to the subject which had appeared up to that time. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 2 "Demijohn" to "Destructor" Dental caries is a process of disintegration which begins in the enamel of a tooth—usually in the region of its neck—and gradually extends through the dentine till the pulp cavity is reached. Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition. The enamel is derived from the outer layer of the embryonic dog-fish, the epiblast, which also gives rise to the epidermis; while the dentine and bony base arise in the underlying mesoblast, the dermis. Text Book of Biology, Part 1: Vertebrata The body of the tooth under the enamel is formed of a hard kind of bone called dentine. A Handbook of Health The Max Planck team sampled dentine from the hobbit tooth in its early attempt to recover DNA, but it is unclear what drill speed was used. Researchers to drill for ancient DNA in 'hobbit' tooth 2011-01-05T23:15:00.950Z They are composed of tubular and convoluted portions of enamel filed up with dentine, and their worn surfaces show a variety of patterns, as in the case of the Proboscidea. Natural History of the Mammalia of India and Ceylon Examine both kinds of sections, noting arrangement and extent of dentine, enamel, and pulp. Physiology and Hygiene for Secondary Schools Each scale consists of a base of true bone, with a little tubercle of a harder substance, dentine, capped by a still denser covering, the enamel. Text Book of Biology, Part 1: Vertebrata E, enamel; D, dentine; P, pulp cavity; C, cement; B, blood vessels; N, nerve. A Handbook of Health Composite Odontoma.—This is a convenient term to apply to certain hard dental tumours which are met with in the jaws, and consist of enamel, dentine, and cement. Manual of Surgery Volume First: General Surgery. Sixth Edition. The white substance that covers and protects the dentine of the crown of the teeth. Mother's Remedies Over One Thousand Tried and Tested Remedies from Mothers of the United States and Canada Of what are the teeth made?—"Of dentine, covered with enamel." Object Lessons on the Human Body A Transcript of Lessons Given in the Primary Department of School No. 49, New York City The only advantage of yellowish teeth rests in the fact that their dentine is, as a rule, stronger. Valere Aude Dare to Be Healthy, Or, The Light of Physical Regeneration It is a variety of dentine, characterized by the minuteness and close arrangement of the tubes, as also by their double flexure. The Gutenberg Webster's Unabridged Dictionary Section I, J, K, and L On section, the tumour is usually laminated, and is seen to consist mainly of dentine with a partial covering of enamel and cement. Manual of Surgery Volume First: General Surgery. Sixth Edition. The predisposing factor is a poor quality of enamel and dentine. Common Diseases of Farm Animals The acid thus generated attacks the enamel of the teeth, causing decay of the dentine. A Practical Physiology Extremely bluish white teeth often consist of a soft, porous and tender dentine. Valere Aude Dare to Be Healthy, Or, The Light of Physical Regeneration The enamel was not at all, and the dentine only slightly, softened. Insectivorous Plants Old Tomes once published the opinion that the contents of the dentine tubules were sensory nerves, on the ground of our feeling so distinctly through our teeth. Life and Letters of Thomas Henry Huxley — Volume 2 The front teeth are now chopping incisors, and the grinding teeth approach those of the modern horse in the distribution of the enamel, dentine, and cement. The Story of Evolution The exposure of the delicate pulp to the air, due to the decay of the dentine, gives rise to the pain of toothache. A Practical Physiology Extremely yellow teeth indicate jaundice, while reddish teeth show hyperaemia of the dentine. Valere Aude Dare to Be Healthy, Or, The Light of Physical Regeneration Experiment 4.—May 1st, a minute and thin bit of dentine, moistened with saliva, was placed on a leaf, which was soon inflected, and re-expanded on the 5th. Insectivorous Plants On the 11th this second leaf began to re-expand; the fragment was manifestly softened, and Dr. Klein reports, "a great deal of enamel and the greater part of the dentine decalcified." Insectivorous Plants Dr. Klein reports, "a great deal of enamel and the greater part of the dentine decalcified." Insectivorous Plants Surrounding the cavity on all sides is the hard substance known as the dentine, or tooth ivory. A Practical Physiology The enamel and dentine both now somewhat softened; and Dr. Klein reports, "less than half the enamel, but the greater part of the dentine decalcified." Insectivorous Plants I therefore asked Dr. Burdon Sanderson to try bone, enamel, and dentine, in artificial gastric juice, and he found that they were after a considerable time completely dissolved. Insectivorous Plants The dentine had become as flexible as thin paper. Insectivorous Plants From these experiments it appears that enamel is attacked by the secretion with more difficulty than dentine, as might have been expected from its extreme hardness; and both with more difficulty than ordinary bone. Insectivorous Plants Outside the dentine of the root is a substance closely resembling bone, called cement. A Practical Physiology |
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