摘要
通过使用X线微区衍射法直接对人天然牙表面正常牙釉质、牙本质及龋坏组织三个测量点进行检测,以测试X’pert Pro型衍射仪对人天然牙正常和早期龋损组织晶体结构改变的检测能力。结果显示,牙磷灰石由多种物相构成,是一种生物混晶,主要物相为羟基磷灰石,龋坏组织中可能有新物相的形成。从正常牙釉质到牙本质再到龋坏组织,晶体a轴逐渐增大,c轴基本不变。晶体晶胞参数计算结果:正常牙釉a=9.550,c=6.883;正常牙本质a=9.554,c=6.883;龋坏组织a=9.558,c=6.884。晶粒尺寸计算结果:正常牙釉质D002=27.600nm;正常牙本质D002=16.561 nm;龋坏组织D002=13.163 nm。结晶性:正常牙釉质>正常牙本质>龋坏组织。结果表明采用新型高分辨X线衍射仪可以非常方便地对牙齿进行X线衍射微区分析。
The main mineral component of natural tooth was determined as calcium apatite many years ago; most of them exist in the form of hydroxyapatite with different crystallites. If a tooth decayed, the crystalline of hydroxyapatite would be changed and decomposed. In our experiment, a natural tooth with caries was measured by high resolution XRD equipment: X'pert Pro. Three spots which included normal enamel, normal dentin and caries tissue were analyzed. The results showed that tooth was a kind of biological mixed crystal composed of many crystal phases, the main crystal phase was hydroxyapatite. From normal enamel to normal dentin and to caries tissue, the length of the a-axis of hydroxyapatite crystaUite increased, the length of the c-axis of hydroxyapatite crystallite remained unchanged. The crystal sizes were: normal enamel D002 = 27. 600nm; normal dentin D002 = 16. 561nm; caries tissue D002 = 13. 163nm. Crystallinity: normal enamd〉normal dentin〉caries tissue. According to our experiment, tooth could be conveniently studied by high resolution microdiffmcion XRD equipment.
出处
《生物医学工程学杂志》
EI
CAS
CSCD
北大核心
2008年第1期65-68,共4页
Journal of Biomedical Engineering
关键词
X线衍射微区分析
牙釉质
牙本质
龋坏
晶体
X-ray diffraction(XRD) microdiffraction Enamel Dentin Caries Crystal