Consideration of dentine permeability in cytotoxicity testing.

Consideration of dentine permeability in cytotoxicity testing.
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细胞毒性测试中考虑牙本质渗透性。

DOI:
10.1111/j.1365-2591.1988.tb00968.x
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发表时间:
1988
影响因子:
5
通讯作者:
Pashley,DH
Pashley,DH
中科院分区:
医学2区
文献类型:
--
作者:
Pashley,DH

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牙髓中细胞毒性变化的发展在很大程度上是由于牙本质的渗透性。也就是说,如果牙本质是不可渗透的,这些变化就不会发生。牙本质渗透性不均匀;它往往在切缘上较低,但在后牙的髓角上较高。在牙釉质-牙本质交界处或牙骨质-牙本质交界处下方相对较低,但在髓室附近急剧增加。颊侧牙本质的渗透性低于牙合侧牙本质,而根侧牙本质的渗透性远低于冠侧牙本质。玷污层的存在与否对牙本质渗透性有着深远的影响。管状硬化或龋齿导致牙本质渗透性大幅降低。牙本质是物质向牙髓扩散的重要屏障。它既限制了扩散表面积,又分散了驱动扩散穿过牙本质的物质的浓度。此外,有证据表明,牙本质可以以许多不同的方式与各种溶质相互作用,因为它们扩散穿过牙本质。新的体外模型系统可以修改,以模拟更密切的条件下,在体内牙本质是介于各种牙科材料和牙髓。因此,包括牙本质在内的生物相容性测试体外方法的开发应该可以提高实验室和临床结果之间的相关性。
The development of cytotoxic changes in the dental pulp is due, in large part, to the permeability of dentine. That is, if dentine were impermeable, these changes would not occur. Dentine permeability is not uniform; it tends to be low over the incisal edges but high over the pulp horns of posterior teeth. It is relatively low beneath the amelo-dentinal junction or the cemento-dentinal junction but increases dramatically near the pulp chamber. Buccal dentine is less permeable than occlusal dentine, while radicular dentine permeability is much lower than that of coronal dentine. The presence or absence of a smear layer has a profound influence on dentine permeability. Tubular sclerosis or dental caries produces large reductions in dentine permeability. Dentine is an important barrier to the diffusion of substances toward the pulp. It both restricts diffusional surface area and dissipates the concentrations of substances driving diffusion across dentine. Further, there is evidence that dentine can interact in many different ways with a variety of solutes as they diffuse across dentine. Newin vitromodel systems can be modified to simulate more closely conditionsin vivowhere dentine is interposed between various dental materials and the pulp. Thus, the development ofin vitromethods of biocompatibility testing that include dentine should improve the correlation between laboratory and clinical results.
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