SCANNING ELECTRON-MICROSCOPY OF DENTAL CALCULUS
SCANNING ELECTRON-MICROSCOPY OF DENTAL CALCULUS
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DOI：
10.1007/bf02547382
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发表时间：
1976-01-01
期刊：
影响因子：
--
通讯作者：
SHTEYER, A
中科院分区：
文献类型：
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作者：
LUSTMANN, J;LEWINEPSTEIN, J;SHTEYER, A
利用扫描电镜研究了无机人牙结石的形态结构。从表面观察来看，牙石显然由两个具有明显钙化模式的成分组成。其中一种成分是由微生物和微生物间物质（斑块基质）上微小钙化晶体的沉淀形成的。这种钙化块通常呈球形，具有海绵状外观，其中空的空间代表了埋葬和退化生物体的前身。因此，在牙结石发展的这个阶段，细胞内钙化并不明显。另一种成分虽然与前者至少有一个共同的钙化前沿，但似乎与微生物钙化没有直接关系。它呈现出不同形状和尺寸的通常较大的晶体生长的配置。这两种钙化模式在分布和尺寸上与通过透射电子显微镜观察到的以及施罗德分别指定的“A 型和 B 型矿化中心”具有可比性。 A 型中心的钙化沉淀已通过 X 射线衍射鉴定为羟基磷灰石。 B 型中心的晶体模式可能代表牙石中存在的其他已知形式的磷酸钙，例如磷酸八钙、钙磷矿和透钙磷石。
The morphologic structure of anorganic human dental calculus was studied by means of the scanning electron microscope. From surface observations, calculus is apparently composed of 2 components with distinguishable patterns of calcification. One component is formed by the precipitation of minute calcific crystals on microorganisms and intermicrobial substances (plaque matrix). Such calcified masses, often spherical in shape, have a sponge-like appearance with empty spaces representing the former sites of entombed and degenerated organisms. Thus, intracellular calcification is not evident at this stage of calculus development. The other component, although having at least 1 common calcification front with the former, does not appear to be directly associated with microbial calcification. It exhibits a configuration of generally larger crystal growths of varying shapes and sizes. These 2 calcification patterns are comparable, both in distribution and size, to what has been observed by means of the transmission electron microscope, and what Schroeder has designated as "types A and B centers of mineralization," respectively. The calcific precipitation in type A centers have been identified by X-ray diffraction as hydroxyapatite. The crystal patterns in type B centers might possibly represent other known forms of calcium phosphates present in calculus, such as octacalcium phosphate, whitlockite and brushite.