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为了从化学成分和晶体结构两方面认识釉质发育不全的本质,并探讨釉质发育不全牙齿与龋齿易感性的关系,将2颗釉质发育不全乳牙用于电子探针研究,比较釉质发育不全部位与正常部位的化学成分,4颗釉质发育不全乳牙和8颗正常乳牙用于X线衍射研究,并与人工合成的羟磷灰石比较,观察病变釉质和正常釉质晶体结构的变化。结果发现:发育不全牙釉质较正常牙釉质晶胞a轴变长,300晶面的晶格面距离增大,镁含量显著增加。结论:发育不全牙釉质晶体结构的改变可能是由于镁含量增加所致;釉质发育不全既有釉质量的减少,又有质的改变,且其质的改变可能增加了釉质发育不全牙齿对龋的易感性。
In order to understand the nature of enamel hypoplasia from the aspects of chemical composition and crystal structure, and to explore the relationship between enamel hypoplasia and caries susceptibility, two enamel hypoplasia was used for electron probe study, comparing enamel hypoplasia with The chemical composition of the normal part, 4 enamel hypoplasia and 8 normal deciduous teeth were used for the X-ray diffraction study. Compared with the synthetic hydroxyapatite, the change of the crystal structure of the enamel and normal enamel was observed. The results showed that the a-axis of hypoplastic enamel became longer than that of normal enamel, the distance between lattice planes of 300 plane increased and the content of magnesium increased significantly. Conclusion: The change of crystal structure of enamel with hypoplasia may be caused by the increase of magnesium content. The enamel hypoplasia not only has the decrease of enamel quality, but also the quality change, and its qualitative change may increase the enamel hypoplasia teeth to caries Susceptibility.