Shearer T R, Kolstad D L, Suttie J W
Am J Vet Res. 1978 Sep;39(9):1393-8.
Incisor teeth were obtained from adult cattle which since 4 months of age to 5 or 6 years were maintained on rations containing a yearly average of 40 ppm F in the forage. Microchemical analyses were performed on the fluorotic bovine incisors. The microdistribution of fluoride varied markedly at different sites within the same tooth. Fluoride concentrations varied with the depth from the tooth surface and were influenced by the concentrations of fluoride present in the forage during amelogenesis, and the presence of hypoplastic pits and hyperplastic coronal cementum in enamel. The cementum in these lesions contained remarkably high concentrations of fluoride, and it was less calcified and more porous than adjacent enamel.
切牙取自成年牛，这些牛从4个月大到5或6岁期间，一直以每年平均含氟量为40 ppm的牧草为食。对患氟斑牙的牛切牙进行了微量化学分析。同一颗牙齿不同部位的氟微观分布差异显著。氟浓度随距牙表面深度的变化而变化，且受釉质形成过程中牧草中氟浓度以及釉质中发育不全凹坑和冠状牙骨质增生的影响。这些病变中的牙骨质含有极高浓度的氟，且与相邻釉质相比，钙化程度更低，孔隙更多。
