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High-resolution electron microscopy of carious dissolution of enamel nano-crystals
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- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF STOMATOLOGY
- Issue:
- 6
- DOI:
- 10.3760/j.issn:1002-0098.2003.06.003
- Key Word:
- 牙釉质;龋齿;显微镜检查,电子;磷灰石
Abstract： 目的在晶格水平上探讨牙釉质磷灰石纳米微晶的龋溶解机制及其与釉质微晶中心暗线的关系.方法应用高分辨透射电镜结合氩离子减薄制样技术,对初期釉质龋病变体部的晶体结构进行观察.结果在初期釉质龋的病变体部,釉质纳米微晶主要以中心优先溶解的方式溶解,偶见晶体周边溶解现象.单个釉质微晶的初期溶解首先表现为沿微晶中心暗线的多个亮斑,其晶格条纹模糊、弯曲或断裂,邻近亮斑可相互融合形成大的亮区,进而形成微晶的中心穿孔.龋溶解微晶的中心穿孔与中心暗线的出现部位相符,并可见中心穿孔沿中心暗线延伸.结论牙釉质纳米微晶的初期龋溶解与晶格缺陷密切相关;微晶中心优先溶解现象可部分归因于晶体的中心暗线,中心暗线可能显示微晶对龋溶解较为敏感的区域.
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