| 词汇 | dentine |
| 释义 | dentine noun[ U ] anatomy mainly UKspecialized(US usuallydentin)uk /ˈden.tiːn/ us /ˈden.tiːn/ a hard substance containing calcium that forms the main part of a tooth and has enamel (= a shiny white substance) covering it: 象牙质（构成牙齿主体的坚硬含钙物质，表面覆盖白色牙釉质） In severe cases, the enamel can be completely worn away, revealing the dentine. Dentin contains numerous microscopic holes called tubules, which lead to the nerves. Damage is extensive on both the dentine and the enamel. The hard, solid-appearing dentine makes up the majority of the tooth's structure. The teeth baby tooth buck-toothed cementum centric cingulum coronal erupt hydroxyapatite interdental labially lingually mesially milk tooth molar pulp cavity pulpal rictus snaggle-toothed snaggled wisdom tooth Examine both kinds of sections, noting arrangement and extent of dentine, enamel, and pulp. Surrounding the cavity on all sides is the hard substance known as the dentine, or tooth ivory. The acid thus generated attacks the enamel of the teeth, causing decay of the dentine. The exposure of the delicate pulp to the air, due to the decay of the dentine, gives rise to the pain of toothache. The only advantage of yellowish teeth rests in the fact that their dentine is, as a rule, stronger. Examples of dentinedentine Dentine does not remodel like bone, so it captures a childhood dietary signal comparable to that of enamel. Afterward, the laser cavities were generated at the dentine-composite border affecting both regions allowing immediate qualitative assessments. A computer-produced image reconstruction is shown of fixed and immuno-stained osteoclasts (bone-resorbing cells) that were cultured on dentine. Standardized human enamel and dentine pieces (surface roughness 0.33 + 0.09 m) were used for - the in vivo collection (six healthy volunteers) of undisturbed biofilms. Their occlusal surface is either covered with enamel bearing radial striations (unworn functional teeth) or exhibits a ring of enamel surrounding the centrally exposed dentine (highly worn functional teeth). Discolored dentine was similarly removed from the two deciduous teeth. He contacted his private dentist, who said that his teeth were probably still sensitive after being cleaned by the hygienist and that he should rub dentine on his gums. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 It is also suspected that it is needed for the formation of the cells that form our bones and the dentine, or enamel, of our teeth. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 The upper incisors are grooved and the enamel on the molars is quickly worn away by chewing leaving the dentine exposed. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Dentine can be as hard as the rest of teeth, and is composed of collagen fibres, reinforced with hydroxyapatite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Their dorsal and ventral shield is made up by numerous polygonal platelets of aspidine, ornamented with large dentine tubercles capped with a thick enameloid layer. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Plates covering the headshield had ridges of dentine. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Hypersensitivity issues may also arise, short sharp pain caused by exposed underlying dentine, after the deterioration of the filling material. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These were quite wear resistant and kept together by cementum and dentine. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The scales of sarcopterygians are true scaloids, consisting of lamellar bone surrounded by layers of vascular bone, dentine-like cosmine, and external keratin. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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