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  cementum
Changes in only two of these parameters-the degree of root cementum resorption and animal life span-might be attributed to the effect of the radiation load.
      
In this paper, the elastic modulus measuring of human cementum is studied.
      
By the great difference in elastic moduli between cementum and dentin it is explained that 1.
      
the behavior of cementum must be taken into consideration when the stress analysis for teeth is carried out.
      
Collagen mineralization in bone, dentine, cementum and cartilage
      
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Degenerative changes occurring in periodontal tissues were demonstrated in six serious systemic diseases causing death namely, dysentery, systemic lupus erythematosis, tuberculosis, nephritis, hepatitis and arteriosclerosis. The degenerative manifestations occurring in periodontal tissues are varied. Hydropic, mucoid, hyalinization, focal necrosis and dystrophic calcifications are found in periodental membrane. Disturbances of bone formation, mostly amorphous and/or immature bone could be seen in alveolar bone....

Degenerative changes occurring in periodontal tissues were demonstrated in six serious systemic diseases causing death namely, dysentery, systemic lupus erythematosis, tuberculosis, nephritis, hepatitis and arteriosclerosis. The degenerative manifestations occurring in periodontal tissues are varied. Hydropic, mucoid, hyalinization, focal necrosis and dystrophic calcifications are found in periodental membrane. Disturbances of bone formation, mostly amorphous and/or immature bone could be seen in alveolar bone. Irregularities of deposition with presenee of granular calcifications of cementum could also be seen. These changes are part of systemic alterations. The periodontal degenerations alone are unable to induce periodontal disease clinically, but are considered as the underlying background of the occurrance and development of periodontal disease.

本文报告因严重系统性疾病死亡者其牙周组织中发生的变性变化,列举了六种疾病:痢疾、播散性红斑狼疮、结核、肾炎、肝炎及动脉硬化。牙周组织中表现的变性变化是多种多样的。常看到的有牙周膜的水样变性、粘液样变、玻璃样变、局灶性坏死和营养不良性钙化。牙槽骨的形成障碍,出现无定型骨或未成熟骨。牙骨质常见沉积不规则并有颗粒样钙化。以上这些变化都是全身性变化的一部分。单独的牙周变性并不致于引起临床上的牙周病,但可以认为它们是牙周病发生和发展的内因基础。

In order to evaluate the efficiency and practical value of the ultrasonic eq-uipment,air turbine scaler and manual instrument,these instruments were res-pectively used to remove the calculus on enamel and cemenatum.Meanwhile,the time for removing the calculus was recorded.And then SEM was used to obser-ve the amount of remaining calculus,as well as the defects and roughness on the enamel and cementum.The experimental results have shown that the ultra-sonic equipment have the highest efficiency in removing...

In order to evaluate the efficiency and practical value of the ultrasonic eq-uipment,air turbine scaler and manual instrument,these instruments were res-pectively used to remove the calculus on enamel and cemenatum.Meanwhile,the time for removing the calculus was recorded.And then SEM was used to obser-ve the amount of remaining calculus,as well as the defects and roughness on the enamel and cementum.The experimental results have shown that the ultra-sonic equipment have the highest efficiency in removing the calculus.But the de-fects and roughness of the cleaned surfaces are considerably apparent.Therefore.this equipment may be preferable to removing calculus on enamel.The efficien-cy of air turbine scaler comes off second best,but the defects and roughness at cleaned surface is least.It could be used for removing the calculus both on ena- mel and cementum.The manual instrument is strenuous and time-consuming,but it is useful at present for removing the subgingival calculus yet.When the sub-gingival calculus are removed,the cementum should not be removed excessively.No matter which kind of instrument is used,it is essential to smooth the den-tai surface after removing calculus.

通过对超音波洁牙机、气涡轮洁牙手机和手用器械分别进行龈上与龈下牙石清除试验,使用扫描电镜观察除石后釉质面和牙骨质面的牙石残留、表面损伤及粗糙度,结合除石所需时间,比较评价这几种器械的效率和实用价值。结果表明,超音波器械效率最高,但牙面受损伤及粗糙度也最明显,故它只适用于龈上牙石洁治;气涡轮洁牙手机的效率次之,对牙面的损伤最小,用于牙釉质面和牙骨质面的除石均合适;手用器械费时费力,但用作龈下结石刮除目前仍有实用价值。进行龈下牙石刮治时,不宜大量去除牙骨质。不论使用何种器械,除石后一定要注意牙面磨光。

To split an extracted symmetric tobacco stain tooth in half-and-half,and randomlyput the one half into experiment group(submerged in various chemical stain removalsolution)and the another half into control group(submerged in distlled water).Theselection indicates that pH 5.0~8.2 phytic acid has satisfied stain removal with no eff-ect on micro-hardness of enamal and cementum.It is confidently recommended for oralhygienic products.Under scanning electron microscope,crystal structure of commonabrasives and...

To split an extracted symmetric tobacco stain tooth in half-and-half,and randomlyput the one half into experiment group(submerged in various chemical stain removalsolution)and the another half into control group(submerged in distlled water).Theselection indicates that pH 5.0~8.2 phytic acid has satisfied stain removal with no eff-ect on micro-hardness of enamal and cementum.It is confidently recommended for oralhygienic products.Under scanning electron microscope,crystal structure of commonabrasives and configuration of dental surface after abrasion turn out the round honeyco-mb-like silicon dioxide and the obtuse haxagon aluminum hydroxide obtain more effec-five stain removal and less harsh on a tooth surface than the acute rhombus calciumcarbonate.It is an effective way to remove stain and keep the teeth white and sparkingwith chemical action and effective mechanical action.

将烟斑着色对称的离体牙一剖为二,随机分入实验组(浸各种袪色素化合物溶液)和对照组(浸蒸馏水),结果表明pH5.0~8.2植酸有满意的去烟斑色素作用,且对于釉质牙骨质的显微硬度无影响,扫描电镜研究了常用摩擦剂的晶体结构及其使用后牙表面的超微结构表明,圆的蜂窝状二氧化硅和角度较钝的六角形氫氧化铝的祛色素作用优于角度较锐的方菱形碳酸钙,对牙面损伤也小。化学作用或有效的机械作用都是祛除色素洁白牙齿的可行办法。

 
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