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dentin
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     V_(?)
     V(?)
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     _m.
     _m中分离出来。
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     Effects of fluoride on dentin
     氟对牙本质作用的研究进展
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     The development of dentin bonding agent
     牙本质粘接剂的研究进展
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     and with the depth of the restorative pin into the dentin.
     且与固位钉攻入牙齿的深度无关
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  dentin
Incisor Dentin of Hibernating Rodents as an Indicator of Some Climatic Factors
      
Architectonics and optical properties of dentin and dental enamel
      
The optical polarization method is used to study the distribution of tubules in human dentin.
      
They exhibit specific optical effects resembling conoscopic patterns, revealing the highly hierarchical structure of the crown dentin.
      
Comparative ablation rate from a Er: YAG laser on enamel and dentin of primary and permanent teeth
      
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The extracted teeth which were treated with the surface-active como-nomer NPG-CGE after been etched in phosphoric acid were adheredtogether with "EB" type Ⅰ composite material. The adhesive proper-ties of the specimens were tested by tensile bond strength. The test results showed, without tooth surface treatment the tensilebond strength was poor .However, the adhesive properties were significantlyincreased in enamel specimens when they were etched first in phosphoricacid. But, when dentin was similarly...

The extracted teeth which were treated with the surface-active como-nomer NPG-CGE after been etched in phosphoric acid were adheredtogether with "EB" type Ⅰ composite material. The adhesive proper-ties of the specimens were tested by tensile bond strength. The test results showed, without tooth surface treatment the tensilebond strength was poor .However, the adhesive properties were significantlyincreased in enamel specimens when they were etched first in phosphoricacid. But, when dentin was similarly treated the result was poor. WhenNPG-CGE was used after etching, the best tensile bond strength wasobtained in both enamel and dentin. After soaking the specimens in water for 100 days the tensile bondstrength of the NPG-GGE treated teeth was apparently unaffected. But,NPG-CGE stored in ethaaol for 2 months began to lose its strength.

用抗张强度实验测定了经偶联剂NPG-CGE与磷酸处理的离体人牙对复合充填树脂的粘结强度。结果表明,牙面经磷酸处理再加用偶联剂的粘结性优于单用磷酸处理,以牙本质的粘结强度增高最明显。进行了粘结耐水实验和偶联剂贮存有效期实验。并对结果作初步讨论。

The ultrastructure and the amino-acid composition of the enamel of the molarteeth have been studied in fossil and/or living Ailuropoda.The methods used includedscanning electron microscopy and automatic amino-acid analyser.The results obtainedare as follows:1.The Hunter-Schreger bands have a thickness in Ailurapoda molars of about8—15 prisms.In cross-cut views,although the enamel prisms show some irregularityin shape,they reveal,in general,a“hexagonal-”or“quadrangular-shaped”.It mayrepresent a basic pattern...

The ultrastructure and the amino-acid composition of the enamel of the molarteeth have been studied in fossil and/or living Ailuropoda.The methods used includedscanning electron microscopy and automatic amino-acid analyser.The results obtainedare as follows:1.The Hunter-Schreger bands have a thickness in Ailurapoda molars of about8—15 prisms.In cross-cut views,although the enamel prisms show some irregularityin shape,they reveal,in general,a“hexagonal-”or“quadrangular-shaped”.It mayrepresent a basic pattern of the enamel structure of Ailuropoda.Besides,in the zoneclosest to the enamel-dentin junction,prisms have decreased in number;and prismsare occasionally entirely missing,resulting in rodless or prismless enamel.2.The amino-acid compositions of the enamel matrix of the Pleistocene Ailuro-poda molar are characterized by a remarkable high content of glycine,alanine,glutamicacid,aspartic acid and leucine.However,it is of interest to note that there is a smallproportion of hydroxyproline in enamel.Since hydroxyproline has been detected inenamel very carefully prepared in the present analysis so that contamination withdentine was almost certainly avoided,it seems reasonably certain that the enamel ma-trix contains a small proportion of this amino-acid.

大熊猫臼齿釉质的超微结构特征主要是施氏明暗带的宽度一般由8—15条釉柱组成;釉柱的横切面一般呈六角形或四角形,由里向外,釉柱的直径逐渐增大。在靠近釉牙本质界处,釉柱数量逐渐减少,有时甚至完全缺失,形成无釉柱结构的釉质。大熊猫臼齿釉质的氨基酸组成主要以甘氨酸,丙氨酸,谷氨酸,天冬氨酸和亮氨酸的含量为最高,而蛋氨酸,胱氨酸和酪氨酸的含量为最低。另外,还含有少量的羟脯氨酸。这种组成模式一般与人类和其它哺乳动物牙齿釉质的氨基酸组成相类似。

The biological compatibility of dental materials have not been extensively tested in our country. There are no unified national standards for such materials. We have done some experiments to assess the biological compatibilities of the polycarboxylic compound ceramic which we developed and intended to use in the clinic.In reference to the American National Standards/ADA Documents No. 41, we have completed: 1) short term systemic toxicity tests: oral route; 2) acute systemic toxicity tests: intraperitoneal injection;...

The biological compatibility of dental materials have not been extensively tested in our country. There are no unified national standards for such materials. We have done some experiments to assess the biological compatibilities of the polycarboxylic compound ceramic which we developed and intended to use in the clinic.In reference to the American National Standards/ADA Documents No. 41, we have completed: 1) short term systemic toxicity tests: oral route; 2) acute systemic toxicity tests: intraperitoneal injection; 3)subacute systemic toxicity tests: oral route; 4) haemolysis tests (in vitro tests directly onmaterial; 5) in vitro cytotoxicity tests; 6) the Ames m.utagenicity tests; 7) short term intramuscular implant tests;8) pyrogen tests(both limulus tests and rabbit tests; 9) intracutaneous injection tests; 10) pulp and dentin response tests.The results of the above tests revealed that the polycarboxylic compound ceramic, had no toxicity, no haemolytic activities, no cytotoxicitY in vitro, no mutagenic activities, no irritation to muscle or skin.Pulp and dentin tests were made to assess the-response of the dental pulp and dentin to the compound material. After 7, 45 and 90 days, the tested teeth were examined under microscope. The results were compared with that of silicate cement and that of zinc oxide and eugenol paste. We found that the response of the pulp and dentin to the compound ceramic were similar to that of zinc oxide and eugenol paste. In some respects, the response were even milder than that of Zinc oxide eugenol paste. The compound ceramic did no harm to pulp and dentin. We concluded that the polycarboxylic compound ceramic possessed very good biological compatibilities and can be used in clinic safely.

本文作者参照美国国家标准(ADA41号文件),对自行研制的羧聚复合陶瓷材料的组织相容性进行了实验研究。实验包括1.急性毒性实验;2.亚急性毒性实验;3.溶血试验;4.皮内试验;5.短期肌肉内植入试验;6.热原试验;7.抑茵试验;8.细胞毒性试验;9.Ames试验;10.摸拟动物牙髓刺激试验。实验结果表明,该材料具有良好的生物相容性,安全无毒,无溶血性、无致突变性,对肌肉组织刺激轻微,对皮肤无刺激,不含热原物质。对牙髓和牙本质的刺激与氧化锌丁香油糊剂所引起的相似,可用于临床。

 
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