[Formation, composition, clinical implications and methods for removing the smeared layer from root canal walls].

Odontostomatologike proodos Pub Date : 1989-08-01
G N Spyropoulos, A N Kourteli
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Abstract

A layer, which is readily detectable at higher magnifications with scanning electron microscope (sem) is consistently seen on canal walls that have been endodontically instrumented. This layer in the international bibliography reported as smeared layer. The surface of this layer is amorphous, irregular and granular. Although the composition of this layer has not been completely determined, it probably contains fine inorganic particles of dentin produced by mechanical preparation of root canal walls. As well as some organic material from necrotic or vital pulp tissue, bacteria and blood cells. The clinical importance of the smeared layer is still not fully understood. It may be beneficial since it is known to plug the orifices of the dentinal tubules and to reduce the permeability of dentin. In addition, the Smeared layer covering prepared areas of root canal prevents medicaments and filling materials from penetrating the dentinal tubules on even contacting the canal wall. The formation of this layer, the composition, the clinical importance and various methods for removing the smeared layer from the system of root canals, is the object of this paper.

[根管壁涂膜的形成、组成、临床意义及清除方法]。
在高倍率的扫描电子显微镜(sem)下,在根管固定后的管壁上可以看到一层很容易检测到的物质。这一层在国际文献报道中称为涂抹层。这一层的表面是无定形的、不规则的、粒状的。虽然这一层的组成尚未完全确定,但它可能含有机械制备根管壁时产生的牙本质的精细无机颗粒。以及一些来自坏死或重要的牙髓组织、细菌和血细胞的有机物质。涂片层的临床重要性尚不完全清楚。它可能是有益的,因为已知它可以堵塞牙本质小管的孔并减少牙本质的渗透性。此外,覆盖根管预备区域的涂抹层可以防止药物和填充物穿透牙本质小管甚至接触根管壁。这一层的形成、组成、临床重要性以及从根管系统中清除这一层的各种方法是本文的研究对象。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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