Shearer T R, Britton J L, DeSart D J, Suttie J W
Am J Vet Res. 1980 Sep;41(9):1543-5.
Cattle were fed forage containing fluoride at a yearly average of 40 mg of fluoride/kg of forage for 5 or 6 years from the time they were 4 months of age. A significant (P < 0.05) negative correlation was observed between the average microhardness of the 3rd premolar and 3rd molar enamel and the fluorosis score of the 2nd incisor. The microhardness of fluorotic outer molar enamel was only 41% of the microhardness values of enamel from control teeth not exposed to long-term fluoride, and electron probe microanalysis indicated increased fluoride concentrations in the molar coronal cementum, enamel, and dentin. Increased incisor fluorosis scores were diagnostic of softer molar enamel. When severe, such changes may have a detrimental effect on the proper mastication and subsequent nutrition of cattle with fluorosis.
从4月龄起，牛被喂食含氟草料，年均含氟量为每千克草料40毫克氟，持续5或6年。观察到第三前磨牙和第三磨牙牙釉质的平均显微硬度与第二切牙的氟斑牙评分之间存在显著（P < 0.05）负相关。氟斑牙外侧磨牙牙釉质的显微硬度仅为未长期接触氟的对照牙齿牙釉质显微硬度值的41%，电子探针微分析表明磨牙牙冠牙骨质、牙釉质和牙本质中的氟浓度增加。切牙氟斑牙评分增加可诊断为磨牙牙釉质较软。严重时，此类变化可能会对患氟斑牙的牛的正常咀嚼及后续营养产生不利影响。
