Hayashi Y
Department of Anatomy (I), Jikei University School of Medicine, Tokyo, Japan.
J Electron Microsc (Tokyo). 1993 Oct;42(5):342-5.
The human partially impacted third molar was used to investigate the initial stage of dental calculus on enamel surface. The thin layer of mineral deposition consisted of needle-like crystals. High resolution electron microscopy (HREM) revealed that these crystals directly contacted each other. Electron diffraction represented that needle-like crystals of calculus consisted of hydroxyapatite (OH-AP). These findings indicate that the high calcium (Ca) x inorganic phosphate (Pi) ion-product condition in an extremely narrow and closed environment produces the stable OH-AP precipitates and that the growth of calculus crystals is thought to advance through the additional mineralization.
用人的部分受影响的第三磨牙来研究牙釉质表面牙菌斑形成的初始阶段。矿物质沉积的薄层由针状晶体组成。高分辨率电子显微镜（HREM）显示这些晶体彼此直接接触。电子衍射表明牙菌斑的针状晶体由羟基磷灰石（OH-AP）组成。这些发现表明，在极其狭窄和封闭的环境中高钙（Ca）×无机磷酸盐（Pi）离子产物条件会产生稳定的OH-AP沉淀物，并且牙结石晶体的生长被认为是通过额外的矿化作用推进的。
